Pit structure wind turbine airfoil design method, device, equipment and medium

Abstract

The invention provides a pit structure wind turbine airfoil design method and device, equipment and a medium, and relates to the technical field of wind power generation new energy, and the method comprises the steps: generating a plurality of groups of different target circular pit parameters, and arranging a plurality of pit structures to a smooth wind turbine airfoil model according to the plurality of groups of different target circular pit parameters, the first target pit structure wind turbine airfoil is obtained, simulation of the pit structure wind turbine airfoil can be achieved, then the first target pit structure wind turbine airfoil is simulated and operated, a target function value composed of the lift-drag ratio parameter and the thrust coefficient is obtained, and therefore the target function value can be used for evaluating the target circular pit parameter. According to the method, the optimal circular pit parameters are determined, and finally the second target pit structure wind turbine airfoil is generated according to the optimal circular pit parameters, so that automatic design and optimization of the pit structure wind turbine airfoil are realized, the influence of various parameters on the airfoil is considered, and the aerodynamic characteristics of the pit structure wind turbine airfoil can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation new energy technology, in particular to a pit structure wind turbine airfoil design method, device, equipment and medium. BACKGROUND

[0002] The wind blade is the core component of the wind turbine, and its aerodynamic characteristics directly affect the power generation capacity and dynamic characteristics of the wind turbine. In addition, the wind turbine blade is composed of a series of airfoils through corresponding aerodynamic arrangement parameters (such as chord length, twist angle, pre-bending, and sweepback). When the airfoil attack angle reaches a certain angle, the stall attack angle phenomenon occurs, which causes the lift coefficient to decrease and the drag coefficient to increase, and the overall lift-drag ratio to decrease. The main reason for the stall is the flow separation on the surface of the airfoil. Therefore, how to effectively improve the stall separation of the airfoil is the key to the research. At present, relevant researchers propose to use ribs, vortex generators, bionic spring sheets, and leading edge bionic structures to improve the aerodynamic performance of the airfoil. In addition, some scholars also propose to arrange structures similar to pits on the suction surface of the airfoil to improve the aerodynamic characteristics of the airfoil. However, the influence of the pit parameters and position distribution on the stall separation of the airfoil has not been discussed. How to better arrange the pit position and pit structure parameters to optimize the aerodynamic characteristics of the airfoil is currently a focus of research. In related technologies, only the diameter size and pit shape of the pit structure are considered, which cannot fully reflect the influence of the pit structure under the combination of multiple parameters on the aerodynamic characteristics and stall flow of the airfoil, resulting in unreasonable pit structure setting and inability to improve the aerodynamic performance of the airfoil to the optimal. SUMMARY

[0003] The present application provides a pit structure wind turbine airfoil design method, device, equipment and medium, which aims to solve the problem of unreasonable pit structure setting caused by only considering the diameter size and pit shape of the pit structure in related technologies.

[0004] The first aspect of the present application provides a pit structure wind turbine airfoil design method, comprising: Randomly generate a plurality of different target circular pit parameters based on a preset circular pit parameter range; wherein the target circular pit parameters at least include a target pit depth-diameter ratio, a target pit spacing, and a target pit arrangement position corresponding to a plurality of pit structures; According to the target circular pit parameters, arrange the pit structure on the suction surface of the smooth wind turbine airfoil model to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters; Based on the first target pit structure wind turbine airfoil corresponding to the target circular pit parameters, obtain the lift-drag ratio parameters and the thrust coefficient corresponding to the first target pit structure wind turbine airfoil; According to the lift-drag ratio parameter and the thrust coefficient corresponding to the first target pit structure wind turbine airfoil, a target function value corresponding to the target circular pit parameter is obtained; the larger the target function value is, the better the target circular pit parameter is; According to the target function value corresponding to the target circular pit parameter, an optimal circular pit parameter is obtained, and a second target pit structure wind turbine airfoil is generated according to the optimal circular pit parameter.

[0005] In a possible implementation, the random generation of multiple groups of different target circular pit parameters based on the preset circular pit parameter range comprises: A random target pit depth-diameter ratio is generated based on a preset pit depth-diameter ratio range; A random target pit spacing is generated based on a preset pit spacing range; A random target pit arrangement position is generated based on a preset pit arrangement position; wherein the target pit arrangement position represents that multiple pit structures are sequentially arranged at the center position of the suction surface of the smooth wind turbine airfoil model; The target pit depth-diameter ratio, the target pit spacing, and the target pit arrangement position are collectively used as a group of target circular pit parameters, and multiple groups of different target circular pit parameters are generated.

[0006] In a possible implementation, the arrangement of pit structures on the suction surface of the smooth wind turbine airfoil model according to the target circular pit parameter to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameter comprises: A pit arrangement center position is determined on the suction surface of the smooth wind turbine airfoil model according to the target pit arrangement position in the target circular pit parameter; According to the target pit depth-diameter ratio and the target pit spacing in the target circular pit parameter, multiple pit structures are arranged at equal intervals on the suction surface of the smooth wind turbine airfoil model from the rear end to the front end, and the center positions of the multiple pit structures arranged after the pit arrangement center position coincide, to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameter.

[0007] In a possible implementation, the obtaining of the lift-drag ratio parameter and the thrust coefficient corresponding to the first target pit structure wind turbine airfoil based on the first target pit structure wind turbine airfoil corresponding to the target circular pit parameter comprises: The first target pit structure wind turbine airfoil corresponding to the target circular pit parameter is simulated to obtain the lift and the drag corresponding to the first target pit structure wind turbine airfoil; According to the lift corresponding to the first target dimple structure wind turbine airfoil, obtain the lift coefficient corresponding to the first target dimple structure wind turbine airfoil; According to the drag corresponding to the first target dimple structure wind turbine airfoil, obtain the drag coefficient corresponding to the first target dimple structure wind turbine airfoil; According to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil, obtain the lift-drag ratio parameter corresponding to the first target dimple structure wind turbine airfoil; According to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil, obtain the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil.

[0008] In a possible implementation, the obtaining of the lift coefficient corresponding to the first target dimple structure wind turbine airfoil according to the lift corresponding to the first target dimple structure wind turbine airfoil includes: determining a reference force according to the chord length, the fluid density in the simulation running process, and the flow velocity corresponding to the first target dimple structure wind turbine airfoil; obtaining the lift coefficient corresponding to the first target dimple structure wind turbine airfoil according to the lift and the reference force corresponding to the first target dimple structure wind turbine airfoil.

[0009] In a possible implementation, the obtaining of the drag coefficient corresponding to the first target dimple structure wind turbine airfoil according to the drag corresponding to the first target dimple structure wind turbine airfoil includes: determining a reference force according to the chord length, the fluid density in the simulation running process, and the flow velocity corresponding to the first target dimple structure wind turbine airfoil; obtaining the drag coefficient corresponding to the first target dimple structure wind turbine airfoil according to the drag and the reference force corresponding to the first target dimple structure wind turbine airfoil.

[0010] In a possible implementation, the obtaining of the lift-drag ratio parameter corresponding to the first target dimple structure wind turbine airfoil according to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil includes: obtaining the lift-drag ratio parameter corresponding to the first target dimple structure wind turbine airfoil by taking the lift coefficient corresponding to the first target dimple structure wind turbine airfoil as a numerator and taking the drag coefficient corresponding to the first target dimple structure wind turbine airfoil as a denominator.

[0011] In a possible implementation, the obtaining of the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil according to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil includes: According to the lift coefficient corresponding to the first target pit structure wind turbine airfoil and the angle of attack corresponding to the first target pit structure wind turbine airfoil, a first sub-parameter corresponding to the inference coefficient is obtained; According to the drag coefficient corresponding to the first target pit structure wind turbine airfoil and the angle of attack corresponding to the first target pit structure wind turbine airfoil, a second sub-parameter corresponding to the inference coefficient is obtained; According to the first sub-parameter and the second sub-parameter, a thrust coefficient corresponding to the first target pit structure wind turbine airfoil is obtained.

[0012] In a possible implementation, the obtaining of the target function value corresponding to the target circular pit parameter according to the lift-drag ratio parameter corresponding to the first target pit structure wind turbine airfoil and the thrust coefficient comprises: The lift-drag ratio parameter corresponding to the first target pit structure wind turbine airfoil and the thrust coefficient are weighted and summed to obtain the target function value corresponding to the target circular pit parameter.

[0013] In a possible implementation, the obtaining of the optimal circular pit parameter according to the target function value corresponding to the target circular pit parameter comprises: According to the target function value corresponding to the target circular pit parameter, the target circular pit parameter with the maximum target function value is determined as the optimal circular pit parameter among all target circular pit parameters.

[0014] In a possible implementation, the method further comprises: The smooth wind turbine airfoil model is simulated to obtain a surface pressure of the smooth wind turbine airfoil model, and a simulation pressure distribution coefficient is obtained according to the surface pressure; An actual pressure distribution coefficient corresponding to an actual model corresponding to the smooth wind turbine airfoil model is obtained; A comprehensive error value between the simulation pressure distribution coefficient and the actual pressure distribution coefficient is obtained; If the comprehensive error value is greater than a preset error threshold, a verification result corresponding to the smooth wind turbine airfoil model is generated as unreasonable; If the comprehensive error value is less than or equal to the preset error threshold, the verification result corresponding to the smooth wind turbine airfoil model is generated as reasonable.

[0015] In a possible implementation, the obtaining of the simulation pressure distribution coefficient according to the surface pressure comprises: obtaining the simulation pressure distribution coefficient according to the surface pressure, fluid density, and flow velocity in a simulation process.

[0016] The second aspect of the present application provides a pit structure wind turbine airfoil design device, comprising: The parameter generation module is configured to generate a plurality of groups of different target circular pit parameters randomly based on a preset circular pit parameter range, wherein the target circular pit parameters at least include target pit depth-diameter ratios, target pit spacings, and target pit arrangement positions corresponding to the plurality of pit structures. The pit structure arrangement module is configured to arrange pit structures on a suction surface of a smooth wind turbine airfoil model according to the target circular pit parameters to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters. The performance parameter acquisition module is configured to acquire lift-drag ratio parameters and thrust coefficients corresponding to the first target pit structure wind turbine airfoil based on the first target pit structure wind turbine airfoil corresponding to the target circular pit parameters. The target function value acquisition module is configured to acquire a target function value corresponding to the target circular pit parameters according to the lift-drag ratio parameters and the thrust coefficients corresponding to the first target pit structure wind turbine airfoil, wherein the larger the target function value is, the more optimal the target circular pit parameters are. The airfoil optimization module is configured to acquire optimal circular pit parameters according to the target function value corresponding to the target circular pit parameters, and to generate a second target pit structure wind turbine airfoil according to the optimal circular pit parameters.

[0017] The third aspect of the present application provides an electronic device including a processor and a memory; the memory is configured to store code instructions; the processor is configured to run the code instructions, so that the electronic device executes the pit structure wind turbine airfoil design method as described in any one of the possible implementation manners of the first aspect.

[0018] The fourth aspect of the present application provides a computer-readable storage medium including computer instructions, when the computer instructions run on an electronic device, make the electronic device execute the pit structure wind turbine airfoil design method as described in any one of the possible implementation manners of the first aspect.

[0019] Advantages: The application provides a pit structure wind turbine airfoil design method, device, equipment and medium. The method generates a plurality of different target circular pit parameters, and according to the plurality of different target circular pit parameters, a plurality of pit structures are arranged to a smooth wind turbine airfoil model to obtain a first target pit structure wind turbine airfoil. The simulation of the pit structure wind turbine airfoil can be realized. Then, the first target pit structure wind turbine airfoil is simulated to obtain a target function value composed of a lift-drag ratio parameter and a thrust coefficient group. Therefore, the target function value can be used to evaluate the target circular pit parameter, and the optimal circular pit parameter is determined. Finally, a second target pit structure wind turbine airfoil is generated according to the optimal circular pit parameter. The automatic design and optimization of the pit structure wind turbine airfoil are realized, the influence of various parameters on the airfoil is considered, and the aerodynamic characteristics of the pit structure wind turbine airfoil can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the description of the embodiments of the application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 It is a flowchart of a pit structure wind turbine airfoil design method according to an embodiment of the application.

[0022] Figure 2 It is a flowchart of a smooth wind turbine airfoil model verification process according to an embodiment of the application.

[0023] Figure 3 It is a pressure distribution coefficient comparison chart according to an embodiment of the application.

[0024] Figure 4 It is a schematic diagram of a circular pit parameter according to an embodiment of the application.

[0025] Figure 5 It is a pit airfoil schematic diagram according to an embodiment of the application.

[0026] Figure 6 It is a lift-drag force coefficient comparison chart before and after optimization according to an embodiment of the application.

[0027] Figure 7 It is a pit airfoil and pit grid refinement chart according to an embodiment of the application.

[0028] Figure 8 (a) is a schematic diagram of a velocity field flow separation of an original wind turbine airfoil according to an embodiment of the application, Figure 8(b) is a schematic diagram of a velocity field flow separation of a pit structure wind turbine airfoil according to an embodiment of the present application.

[0029] Figure 9 is a structural schematic diagram of a pit structure wind turbine airfoil design device according to an embodiment of the present application.

[0030] Figure 10 is a structural schematic diagram of an electronic device according to an embodiment of the present application.

[0031] Legend: 901-Parameter generation module, 902-Pit structure arrangement module, 903-Performance parameter acquisition module, 904-Target function value acquisition module, 905-Airfoil optimization module, 1001-Memory, 1002-Processor, 1003-Communication bus. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the related art, a pit structure is arranged on an airfoil to improve the aerodynamic characteristics of the airfoil. However, the related art only studies the pit diameter size and pit shape, which can improve the aerodynamic characteristics of the airfoil to a certain extent. However, it cannot fully reflect the influence of the pit structure on the aerodynamic characteristics of the airfoil, leading to unreasonable pit structure setting, and the existing technology cannot fully realize automatic pit structure arrangement.

[0034] Therefore, the embodiments of the present application propose a pit structure wind turbine airfoil design method. By generating multiple sets of different target circular pit parameters, and arranging multiple pit structures to a smooth wind turbine airfoil model according to the multiple sets of different target circular pit parameters, a first target pit structure wind turbine airfoil is obtained, which can realize simulation of the pit structure wind turbine airfoil. Then, the first target pit structure wind turbine airfoil is simulated to obtain a target function value composed of a lift-drag ratio parameter and a thrust coefficient group, so that the target function value can be used to evaluate the target circular pit parameters to determine the optimal circular pit parameters. Finally, a second target pit structure wind turbine airfoil is generated according to the optimal circular pit parameters, which not only realizes automatic design and optimization of the pit structure wind turbine airfoil, but also considers the influence of multiple parameters on the airfoil, which can effectively improve the aerodynamic characteristics of the pit structure wind turbine airfoil.

[0035] Please refer to Figure 1A pit structure wind turbine airfoil design method is provided for the embodiments of the application, and the method comprises the following steps: S101, a plurality of different target circular pit parameters are randomly generated based on a preset circular pit parameter range. The target circular pit parameters at least include a target pit depth-diameter ratio corresponding to a plurality of pit structures, a target pit spacing, and a target pit arrangement position.

[0036] The target pit depth-diameter ratio refers to the ratio between the depth and the diameter of the pit. The pit diameter selected by the application is fixed, so the target pit depth-diameter ratio corresponding circular pit parameter range should be controlled by the depth. After the target pit depth-diameter ratio corresponding circular pit parameter range is randomly generated, the target pit depth-diameter ratio can be determined, and thus the pit depth can be determined. The pit structures are generally arranged in sequence, so there should be a certain spacing between different pits. Therefore, the target pit spacing refers to the spacing between any two adjacent pit structures. After the target pit spacing corresponding circular pit parameter range is randomly generated, the target pit spacing can be determined. After the target pit depth-diameter ratio and the target pit spacing are determined, the plurality of pit structures can be regarded as a whole, and the center position of the whole can be used as the target pit arrangement position. After the target pit arrangement position corresponding circular pit parameter range is randomly generated, the target pit arrangement position can be determined. Other parameters of the pit structure can still be optimized using the scheme described in the application, or the existing experimental values with good effects can be directly set.

[0037] S102, according to the target circular pit parameters, the pit structures are arranged on the suction surface of the smooth wind turbine airfoil model to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters.

[0038] The smooth wind turbine airfoil model can be a pre-constructed simulation model. The operation of the airfoil can be simulated through the smooth wind turbine airfoil model, so as to determine the aerodynamic characteristics during the operation of the airfoil. After the target circular pit parameters are determined, the arrangement position of each pit structure and the positional relationship between different pit structures can be determined, so as to arrange the pit structures on the suction surface of the smooth wind turbine airfoil model to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters.

[0039] S103, based on the first target pit structure wind turbine airfoil corresponding to the target circular pit parameters, the lift-drag ratio parameter and the thrust coefficient corresponding to the first target pit structure wind turbine airfoil are obtained.

[0040] The first target pit structure wind turbine airfoil corresponding to the target circular pit parameters is equivalent to a possible pit structure layout scheme. In order to evaluate this set of target circular pit parameters, the first target pit structure wind turbine airfoil can be simulated to determine the lift and drag corresponding to the first target pit structure wind turbine airfoil. Further, based on the lift and drag, the lift-to-drag ratio parameters and thrust coefficient corresponding to the first target pit structure wind turbine airfoil can be obtained.

[0041] S104: Obtain an objective function value corresponding to the target circular dimple parameters based on the lift-to-drag ratio parameter and the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil. A larger objective function value indicates a more optimal target circular dimple parameter.

[0042] The lift-to-drag ratio parameter and thrust coefficient corresponding to the first target dimple-structured wind turbine airfoil are parameters that characterize the performance of the first target dimple-structured wind turbine airfoil and also reflect the quality of the target circular dimple parameters. Therefore, the objective function value corresponding to the target circular dimple parameters can be obtained by taking a weighted sum of the lift-to-drag ratio parameter and the thrust coefficient, or by directly adding them.

[0043] Because a larger objective function value indicates a better target circular dimple parameter, the entire dimple-structured wind turbine airfoil design can be considered an optimization of the objective function value. In addition to the technical solutions described in the embodiments of this application, other concepts for optimizing circular dimple parameters with the goal of maximizing the objective function value are also within the scope of protection of this application.

[0044] S105 , obtaining optimal circular pit parameters according to the objective function values ​​corresponding to the target circular pit parameters, and generating a second target pit structure wind turbine airfoil according to the optimal circular pit parameters.

[0045] Because the larger the objective function value, the better the target circular pit parameters, the target circular pit parameters with the largest objective function value can be determined as the optimal circular pit parameters. After replacing the target circular pit parameters in any first target pit structure wind turbine airfoil with the optimal circular pit parameters, the second target pit structure wind turbine airfoil can be obtained.

[0046] In one possible embodiment, after generating the second target pit structure wind turbine airfoil according to the optimal circular pit parameters, it also includes: performing numerical simulation calculations on the second target pit structure wind turbine airfoil, using a high-performance calculator to calculate the aerodynamic characteristics and flow field characteristics under the optimized conditions, combining the data processing program to perform flow field processing and form a sharp contrast with the smooth airfoil, thereby improving the airfoil flow stall separation and improving the aerodynamic characteristics of the airfoil, which can facilitate the viewing and verification of the design effect.

[0047] The method can obtain a second target pit structure wind turbine airfoil, and provide design reference for a staff. The method realizes automatic optimization of the circular pit parameters and automatic CFD processing, thereby realizing optimization design of the wind turbine blade airfoil, improving stall separation of the airfoil, improving the aerodynamic characteristics of the airfoil under a certain attack angle, and effectively improving the design efficiency of the pit structure wind turbine airfoil.

[0048] In a possible implementation, a plurality of different target circular pit parameters are randomly generated based on a preset circular pit parameter range, including: S101.1. A random target pit depth-diameter ratio is generated based on a preset pit depth-diameter ratio range.

[0049] S101.2. A random target pit spacing is generated based on a preset pit spacing range.

[0050] S101.3. A random target pit arrangement position is generated based on a preset pit arrangement position. The target pit arrangement position represents a central position of sequentially arranging the plurality of pit structures on the suction surface of the smooth wind turbine airfoil model.

[0051] S101.4. The target pit depth-diameter ratio, the target pit spacing, and the target pit arrangement position are collectively taken as a group of target circular pit parameters, and a plurality of different target circular pit parameters are generated.

[0052] For example, it is assumed that the pit structure to be arranged is 3, the diameter of the pit structure is 10 mm, the target pit depth-diameter ratio in a group of target circular pit parameters is 0.15, and the depth of the pit structure should be 1.5 mm. The target pit spacing is 10 mm, so the spacing between the first pit structure and the second pit structure is 10 mm, the spacing between the second pit structure and the third pit structure is 10 mm, and the spacing between the first pit structure and the third pit structure is 20 mm. It is assumed that the target pit arrangement position is set to 0.25 c , so the central positions of the three pits should be located at 0.25 c , so the central position of the first pit structure should be arranged at 0.2 c , the central position of the second pit structure should be arranged at 0.25 c , and the central position of the third pit structure should be arranged at 0.3 c . c represents a chord length of the airfoil.

[0053] In a possible implementation, according to the target circular pit parameters, the pit structures are arranged on the suction surface of the smooth wind turbine airfoil model to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters, including: S102.1, according to the target pit arrangement position in the target circular pit parameters, the pit arrangement center position is determined on the suction surface of the smooth wind turbine airfoil model.

[0054] The target pit arrangement position refers to the center position after the arrangement of the plurality of pit structures, and therefore, the pit arrangement center position can be determined on the suction surface of the smooth wind turbine airfoil model according to the target pit arrangement position.

[0055] S102.2, according to the target pit depth-diameter ratio and the target pit spacing in the target circular pit parameters, the plurality of pit structures are arranged at equal intervals along the direction from the rear end to the front end of the smooth wind turbine airfoil model on the suction surface of the smooth wind turbine airfoil model, and the center positions of the plurality of pit structures after the arrangement coincide with the pit arrangement center position, to obtain the first target pit structure wind turbine airfoil corresponding to the target circular pit parameters.

[0056] In the process of arranging the pit structures on the suction surface of the smooth wind turbine airfoil model according to the target circular pit parameters, a parallel running method can be used to simultaneously simulate a plurality of first target pit structure wind turbine airfoils, which can effectively improve the automation design efficiency of the pit structure wind turbine airfoil, but a large amount of computer computing power is consumed. A one-by-one simulation method can also be used, in which only one first target pit structure wind turbine airfoil is simulated each time, and after the target function value corresponding to the target circular pit parameters is determined, the next simulation process is performed, in which the target circular pit parameters are replaced. Although the design efficiency is general, the computer computing power consumption is small, and this method can be applied to more computers.

[0057] In a possible implementation, based on the first target pit structure wind turbine airfoil corresponding to the target circular pit parameters, the lift-drag ratio parameter and the thrust coefficient corresponding to the first target pit structure wind turbine airfoil are obtained, including: S103.1, the first target pit structure wind turbine airfoil corresponding to the target circular pit parameters is simulated to obtain the lift and the drag corresponding to the first target pit structure wind turbine airfoil.

[0058] For example, a high-fidelity CFD (Computational Fluid Dynamics) algorithm can be used to perform numerical simulation calculation on the first target pit structure wind turbine airfoil, so as to determine the lift and the drag corresponding to the first target pit structure wind turbine airfoil.

[0059] S103.2. Obtain a lift coefficient corresponding to the first target pit-structure wind turbine airfoil according to the lift corresponding to the first target pit-structure wind turbine airfoil.

[0060] Obtaining a lift coefficient corresponding to the first target concave-structure wind turbine airfoil based on the lift corresponding to the first target concave-structure wind turbine airfoil includes: determining a reference force based on a chord length corresponding to the first target concave-structure wind turbine airfoil, a fluid density during a simulation, and a flow velocity. Obtaining a lift coefficient corresponding to the first target concave-structure wind turbine airfoil based on the lift corresponding to the first target concave-structure wind turbine airfoil and the reference force.

[0061] During the reference force acquisition process, the chord length corresponding to the first target concave-shaped wind turbine airfoil, as well as the fluid density and flow velocity during the simulation run, are all fixed. However, when the airfoil's angle of attack reaches a certain angle, a stall angle of attack occurs, causing a decrease in the lift coefficient and an increase in the drag coefficient, resulting in a lower overall lift-to-drag ratio. To avoid the situation where the optimal circular concave parameters can only be optimized at a specific angle of attack, the lift coefficient corresponding to the first target concave-shaped wind turbine airfoil can be acquired by continuously varying the angle of attack to obtain multiple lift coefficients corresponding to the first target concave-shaped wind turbine airfoil.

[0062] For example, a random angle of attack between -6° and 20° can be generated, and then multiple lift coefficients corresponding to the first target concave-shaped wind turbine airfoil can be obtained based on the randomly generated angle of attack. Then, after changing the angle of attack, multiple lift coefficients corresponding to the first target concave-shaped wind turbine airfoil can be obtained again. This process can be repeated multiple times to obtain multiple lift coefficients corresponding to the first target concave-shaped wind turbine airfoil.

[0063] Exemplarily, based on the chord length corresponding to the first target pit structure wind turbine airfoil, the fluid density and flow velocity during the simulation operation, the reference force is determined as: .in, represents the fluid density during the simulation run, Indicates the flow velocity of the fluid during the simulation operation. represents the chord length of the wind turbine blade with the first target dimple structure.

[0064] Exemplarily, according to the lift corresponding to the first target pit structure wind turbine airfoil and the reference force, the lift coefficient corresponding to the first target pit structure wind turbine airfoil is obtained as follows: .in, Indicates the i The lift corresponding to the first target pit structure wind turbine airfoil at the angle of attack is: Indicates the i The lift coefficient corresponding to the first target pit structure wind turbine airfoil at the attack angle.

[0065] S103.3, obtaining the drag coefficient corresponding to the first target dimple structure wind turbine airfoil according to the drag corresponding to the first target dimple structure wind turbine airfoil.

[0066] Obtaining the drag coefficient corresponding to the first target dimple structure wind turbine airfoil according to the drag corresponding to the first target dimple structure wind turbine airfoil includes: determining a reference force according to the chord length corresponding to the first target dimple structure wind turbine airfoil, the fluid density in the simulation running process, and the flow velocity. Obtaining the drag coefficient corresponding to the first target dimple structure wind turbine airfoil according to the drag corresponding to the first target dimple structure wind turbine airfoil and the reference force.

[0067] The way of obtaining the drag coefficient corresponding to the first target dimple structure wind turbine airfoil is similar to that of obtaining the lift coefficient, which also needs to obtain the drag coefficient at different attack angles, and the attack angles are the same as those of obtaining the lift coefficient.

[0068] For example, obtaining the drag coefficient corresponding to the first target dimple structure wind turbine airfoil according to the drag corresponding to the first target dimple structure wind turbine airfoil and the reference force is: . Wherein, represents the drag of the first target dimple structure wind turbine airfoil at the i th attack angle, i represents the drag coefficient of the first target dimple structure wind turbine airfoil at the i th attack angle. i

[0069] S103.4, obtaining the lift-drag ratio parameter corresponding to the first target dimple structure wind turbine airfoil according to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil.

[0070] Obtaining the lift-drag ratio parameter corresponding to the first target dimple structure wind turbine airfoil according to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil includes: taking the lift coefficient corresponding to the first target dimple structure wind turbine airfoil as the numerator and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil as the denominator to obtain the lift-drag ratio parameter corresponding to the first target dimple structure wind turbine airfoil.

[0071] For example, the lift-drag ratio parameter corresponding to the first target dimple structure wind turbine airfoil can be: / .

[0072] S103.5, obtaining the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil according to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil.

[0073] ​​According to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil, the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil is obtained, including: according to the lift coefficient corresponding to the first target dimple structure wind turbine airfoil and the angle of attack corresponding to the first target dimple structure wind turbine airfoil, a first sub-parameter corresponding to the inference coefficient is obtained. According to the drag coefficient corresponding to the first target dimple structure wind turbine airfoil and the angle of attack corresponding to the first target dimple structure wind turbine airfoil, a second sub-parameter corresponding to the inference coefficient is obtained. According to the first sub-parameter and the second sub-parameter, the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil is obtained.

[0074] For example, according to the lift coefficient corresponding to the first target dimple structure wind turbine airfoil and the angle of attack corresponding to the first target dimple structure wind turbine airfoil, the first sub-parameter corresponding to the inference coefficient is obtained as follows: . Wherein, represents the angle of attack, i represents the sine function. sin

[0075] According to the drag coefficient corresponding to the first target dimple structure wind turbine airfoil and the angle of attack corresponding to the first target dimple structure wind turbine airfoil, the second sub-parameter corresponding to the inference coefficient is obtained as follows: . Wherein, cos represents the cosine function.

[0076] According to the first sub-parameter and the second sub-parameter, the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil is obtained as follows: . Wherein, represents the angle of attack, i the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil.

[0077] The lift-drag ratio parameter and the thrust coefficient obtained by the embodiments of the present application can effectively evaluate the target circular dimple parameters.

[0078] In a possible implementation, according to the lift-drag ratio parameter and the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil, the target function value corresponding to the target circular dimple parameter is obtained, including: the lift-drag ratio parameter and the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil are weighted and summed to obtain the target function value corresponding to the target circular dimple parameter.

[0079] For example, the lift-drag ratio parameter and the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil are weighted and summed as follows:

[0080]

[0081] ​

[0082] wherein, denotes the objective function, denotes a preset weight parameter between (0, 1), denotes a first sub-function related to the lift-drag ratio parameter, denotes a second sub-function related to the thrust coefficient, n denotes the number of attack angles.

[0083] By weighted summing the lift-drag ratio parameters and the thrust coefficients at each attack angle, the final optimal circular pit parameters can be obtained to realize optimization only at a specific attack angle, so that the pit structure parameter optimization is more accurate.

[0084] In a possible implementation, the optimal circular pit parameter is obtained according to the target function value corresponding to the target circular pit parameter, including: determining the target circular pit parameter with the maximum target function value as the optimal circular pit parameter from all target circular pit parameters according to the target function value corresponding to the target circular pit parameter.

[0085] Please refer to Figure 2 , the flowchart of the smooth wind turbine airfoil model verification process provided by the embodiments of the present application. The verification process includes: S201, simulate running the smooth wind turbine airfoil model, obtain the surface pressure of the smooth wind turbine airfoil model, and obtain the simulation pressure distribution coefficient according to the surface pressure.

[0086] In a possible implementation, the simulation pressure distribution coefficient is obtained according to the surface pressure, including: obtaining the simulation pressure distribution coefficient according to the surface pressure, the fluid density and the flow velocity in the simulation running process.

[0087] Exemplarily,

[0088] wherein, denotes the pressure distribution coefficient, denotes the surface pressure of the smooth wind turbine airfoil model, denotes the pressure at infinity, denotes the fluid density in the simulation running process, denotes the flow velocity of the fluid in the simulation running process.

[0089] S202, obtain the actual pressure distribution coefficient corresponding to the actual model corresponding to the smooth wind turbine airfoil model.

[0090] The actual pressure distribution coefficient corresponding to the actual model corresponding to the smooth wind turbine airfoil model can be pre-stored data, or data input by the user through human-computer interaction.

[0091] S203, obtain a comprehensive error value between the simulated pressure distribution coefficient and the actual pressure distribution coefficient.

[0092] The comprehensive error value between the simulated pressure distribution coefficient and the actual pressure distribution coefficient can be a mean square error or an error sum, and the embodiments of the application are not limited.

[0093] S204, if the comprehensive error value is greater than a preset error threshold, then the verification result of the smooth wind turbine airfoil model is unreasonable.

[0094] When the calculation method of the comprehensive error value is different, the error threshold should also be different, that is, a corresponding preset error threshold is set for different comprehensive error value calculation methods.

[0095] S205, if the comprehensive error value is less than or equal to the preset error threshold, then the verification result of the smooth wind turbine airfoil model is reasonable.

[0096] Since the price of the entire wind turbine test is expensive and the test process is too complex, the embodiments of the application use a separate airfoil to optimize the pit structure parameters, and by obtaining the comprehensive error value between the smooth wind turbine airfoil model and the actual model corresponding thereto, it can be determined whether the smooth wind turbine airfoil model is reasonable, thereby ensuring that the pit structure parameter optimization is effective.

[0097] Based on the pit structure wind turbine airfoil design method provided in the above embodiments of the application, the method proposed in the disclosure is introduced in detail through a specific embodiment, and the specific steps are as follows: Based on the pit structure wind turbine airfoil design method, the wind turbine airfoil that can be selected is the DU91-W2-250 airfoil. To maintain consistency with the experiment, the airfoil chord length is 0.6 m, the airfoil attack angle is 0°, the Reynolds number is 3.0x105, a suitable fluid calculation domain is given, the corresponding boundary conditions are set, the structured grid is set around the airfoil, and based on the SST k-ωTransition turbulent flow model (shear stress transport k-ω model), numerical calculation is performed to obtain the dimensionless pressure distribution coefficient diagram of the smooth airfoil as shown in Figure 3 .

[0098] As shown in Figure 4 and the accompanying Figure 5 , three circular pit structures can be arranged at the suction surface position of the DU91-W2-250 airfoil. Figure 5 The dimensionless airfoil is shown in d , the size of the pit cross section has randomness, and here the diameter of the pit is selected to be 10 mm, and the pit depth-diameter ratio is h / d is 0.15, h represents the pit depth, the pit spacing I is 1 d , the initial pit arrangement position is 0.25 c ; in the subsequent optimization process, only the target pit depth-diameter ratio, the target pit spacing and the target pit arrangement position of the circular pit structure need to be changed, so that the simulation operation of the wind turbine airfoil with different pit structures can be realized.

[0099] The value constraint range of the pit parameters is set, the circular pit parameter range corresponding to the target pit depth-diameter ratio is set as 0.1d~4 d , the circular pit parameter range corresponding to the target pit depth-diameter ratio is set as 0.05~0.35, and the circular pit parameter range corresponding to the target pit arrangement position is set as 0.20~0.45 c ; the weighted sum function of the lift-drag ratio and the thrust coefficient of the airfoil under each attack angle is taken as the objective function at the Reynolds number of 3.0×105; based on the initial pit structure wind turbine airfoil, a python script is edited to automatically program, and a CFD solver and an optimization algorithm are called at the same time, so that the automatic optimization of the pit structure parameters and the layout parameters is realized, and finally the optimized parameters are shown in Table 1, and the lift-drag ratio coefficient diagram is shown in Figure 6 .

[0100] Table 1

[0101] Next, the determined pit structure wind turbine airfoil is simulated in detail, and the grid near the airfoil boundary and the pit is refined. The grid of the optimized pit airfoil is shown in Figure 7 , the grid growth rate is 1.02, the grid satisfies the accuracy requirement after the irrelevance verification, the total number of grids is 20.93W, the calculation boundary setting and the calculation method are carried out according to the above steps, and then the flow of the airfoil under a certain attack angle before and after optimization is shown in Figure 7 .

[0102] It can be seen from Figure 7 that the lift-drag ratio of the airfoil is slightly improved under small attack angle, and the improvement is about 2.01%. The improvement is more obvious under large attack angle, and the improvement is about 26%. Combined with Figure 8 , it can be determined that the design method obviously improves the stall separation of the airfoil flow, thereby effectively proving the feasibility of the design method.

[0103] Please refer to Figure 9 , based on the same inventive concept, another embodiment of the present application provides a pit structure wind turbine airfoil design device, which comprises: The parameter generation module 901 is configured to randomly generate a plurality of groups of different target circular pit parameters based on a preset circular pit parameter range. The target circular pit parameters at least include target pit depth-diameter ratios corresponding to the plurality of pit structures, target pit spacings, and target pit arrangement positions.

[0104] The pit structure arrangement module 902 is configured to arrange pit structures on a suction surface of the smooth wind turbine airfoil model according to the target circular pit parameters, to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters.

[0105] The performance parameter acquisition module 903 is configured to acquire lift-drag ratio parameters and thrust coefficients corresponding to the first target pit structure wind turbine airfoil based on the first target pit structure wind turbine airfoil corresponding to the target circular pit parameters.

[0106] The target function value acquisition module 904 is configured to acquire a target function value corresponding to the target circular pit parameters according to the lift-drag ratio parameters and the thrust coefficients corresponding to the first target pit structure wind turbine airfoil. The greater the target function value is, the more optimal the target circular pit parameters are.

[0107] For example, the target function value corresponding to the target circular pit parameters is acquired according to the lift-drag ratio parameters and the thrust coefficients corresponding to the first target pit structure wind turbine airfoil, including: the lift-drag ratio parameters and the thrust coefficients corresponding to the first target pit structure wind turbine airfoil are weighted and summed to obtain the target function value corresponding to the target circular pit parameters.

[0108] The airfoil optimization module 905 is configured to acquire optimal circular pit parameters according to the target function value corresponding to the target circular pit parameters, and generate a second target pit structure wind turbine airfoil according to the optimal circular pit parameters.

[0109] For example, the optimal circular pit parameters are acquired according to the target function value corresponding to the target circular pit parameters, including: the target function value corresponding to the target circular pit parameters is used to determine, among all the target circular pit parameters, a target circular pit parameter with the maximum target function value as the optimal circular pit parameter.

[0110] In a possible implementation, the parameter generation module 901 includes a depth-diameter ratio generation sub-module, a spacing generation sub-module, a position generation sub-module, and a target circular pit parameter generation sub-module.

[0111] The depth-diameter ratio generation sub-module is configured to generate a random target pit depth-diameter ratio based on a preset pit depth-diameter ratio range.

[0112] The spacing generation sub-module is configured to generate a random target pit spacing based on a preset pit spacing range.

[0113] a position generation sub-module, configured to generate a target pit arrangement position based on a preset pit arrangement position, wherein the target pit arrangement position represents that a plurality of pit structures are sequentially arranged at a center position of a suction surface of the smooth wind turbine airfoil model.

[0114] a target circular pit parameter generation sub-module, configured to take the target pit depth-diameter ratio, the target pit spacing, and the target pit arrangement position as a group of target circular pit parameters, and generate a plurality of different groups of target circular pit parameters.

[0115] In a possible implementation, the pit structure arrangement module 902 includes a position determination sub-module and a pit arrangement sub-module.

[0116] The position determination sub-module is configured to determine a pit arrangement center position on the suction surface of the smooth wind turbine airfoil model according to the target pit arrangement position in the target circular pit parameters.

[0117] The pit arrangement sub-module is configured to arrange a plurality of pit structures on the suction surface of the smooth wind turbine airfoil model at equal intervals along a direction from a rear end to a front end of the smooth wind turbine airfoil model according to the target pit depth-diameter ratio and the target pit spacing in the target circular pit parameters, and the center positions of the plurality of pit structures after the arrangement coincide with the pit arrangement center position, to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters.

[0118] In a possible implementation, the performance parameter acquisition module 903 includes a lift-drag force acquisition sub-module, a lift coefficient acquisition sub-module, a drag coefficient acquisition sub-module, a lift-drag ratio parameter acquisition sub-module, and a thrust coefficient acquisition sub-module.

[0119] The lift-drag force acquisition sub-module is configured to simulate the first target pit structure wind turbine airfoil corresponding to the target circular pit parameters, and acquire lift and drag corresponding to the first target pit structure wind turbine airfoil.

[0120] The lift coefficient acquisition sub-module is configured to acquire a lift coefficient corresponding to the first target pit structure wind turbine airfoil according to the lift corresponding to the first target pit structure wind turbine airfoil.

[0121] The drag coefficient acquisition sub-module is configured to acquire a drag coefficient corresponding to the first target pit structure wind turbine airfoil according to the drag corresponding to the first target pit structure wind turbine airfoil.

[0122] The lift-drag ratio parameter acquisition sub-module is configured to acquire a lift-drag ratio parameter corresponding to the first target pit structure wind turbine airfoil according to the lift coefficient and the drag coefficient corresponding to the first target pit structure wind turbine airfoil.

[0123] The thrust coefficient obtaining submodule is configured to obtain the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil according to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil.

[0124] For example, the lift coefficient corresponding to the first target dimple structure wind turbine airfoil is obtained according to the lift corresponding to the first target dimple structure wind turbine airfoil, which includes: determining a reference force according to the chord length corresponding to the first target dimple structure wind turbine airfoil, the fluid density in the simulation running process and the flow velocity; and obtaining the lift coefficient corresponding to the first target dimple structure wind turbine airfoil according to the lift corresponding to the first target dimple structure wind turbine airfoil and the reference force.

[0125] For example, the drag coefficient corresponding to the first target dimple structure wind turbine airfoil is obtained according to the drag corresponding to the first target dimple structure wind turbine airfoil, which includes: determining a reference force according to the chord length corresponding to the first target dimple structure wind turbine airfoil, the fluid density in the simulation running process and the flow velocity; and obtaining the drag coefficient corresponding to the first target dimple structure wind turbine airfoil according to the drag corresponding to the first target dimple structure wind turbine airfoil and the reference force.

[0126] For example, the lift-drag ratio parameter corresponding to the first target dimple structure wind turbine airfoil is obtained according to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil, which includes: taking the lift coefficient corresponding to the first target dimple structure wind turbine airfoil as the numerator and taking the drag coefficient corresponding to the first target dimple structure wind turbine airfoil as the denominator to obtain the lift-drag ratio parameter corresponding to the first target dimple structure wind turbine airfoil.

[0127] For example, the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil is obtained according to the lift coefficient and the drag coefficient corresponding to the first target dimple structure wind turbine airfoil, which includes: obtaining a first sub-parameter corresponding to the lift coefficient according to the lift coefficient corresponding to the first target dimple structure wind turbine airfoil and the angle of attack corresponding to the first target dimple structure wind turbine airfoil; obtaining a second sub-parameter corresponding to the drag coefficient according to the drag coefficient corresponding to the first target dimple structure wind turbine airfoil and the angle of attack corresponding to the first target dimple structure wind turbine airfoil; and obtaining the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil according to the first sub-parameter and the second sub-parameter.

[0128] In a possible implementation, the device further includes a model verification module; the model verification module includes a simulated pressure distribution coefficient obtaining submodule, an actual pressure distribution coefficient obtaining submodule, an error value obtaining submodule and a verification result obtaining submodule.

[0129] The simulation pressure distribution coefficient acquisition submodule is configured to simulate running the smooth wind turbine airfoil model, acquire the surface pressure of the smooth wind turbine airfoil model, and acquire the simulation pressure distribution coefficient according to the surface pressure. For example, the simulation pressure distribution coefficient is acquired according to the surface pressure, the fluid density in the simulation running process, and the flow velocity.

[0130] The actual pressure distribution coefficient acquisition submodule is configured to acquire the actual pressure distribution coefficient corresponding to the actual model corresponding to the smooth wind turbine airfoil model. The error value acquisition submodule is configured to acquire a comprehensive error value between the simulation pressure distribution coefficient and the actual pressure distribution coefficient. The verification result acquisition submodule is configured to generate a verification result corresponding to the smooth wind turbine airfoil model as unreasonable in a case where the comprehensive error value is greater than a preset error threshold. The verification result acquisition submodule is further configured to generate the verification result corresponding to the smooth wind turbine airfoil model as reasonable in a case where the comprehensive error value is less than or equal to the preset error threshold.

[0131] For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the related parts refer to the part of the method embodiment.

[0132] Please refer to Figure 10 Based on the same inventive concept, another embodiment of the present application provides an electronic device, which comprises a memory 1001 and a processor 1002. The memory 1001 and the processor 1002 complete mutual communication through a communication bus 1003.

[0133] The memory 1001 is configured to store code instructions.

[0134] The processor 1002 is configured to run the code instructions, so that the electronic device executes the pit structure wind turbine airfoil design method provided in the embodiments of the present application.

[0135] The communication bus 1003 mentioned above can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus 1003 can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or only one type of bus. The communication interface is used for communication between the terminal and other devices. The memory 1001 can include a Random Access Memory (RAM) and can also include a non-volatile memory, such as at least one disk memory. Optionally, the memory 1001 can also be at least one storage device located away from the aforementioned processor 1002.

[0136] The processor 1002 mentioned above can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc. It can also be a Digital Signal Processing (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component.

[0137] In addition, to achieve the above-mentioned purpose, the embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the pit structure wind turbine airfoil design method provided by the embodiment of the present application.

[0138] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, equipment or computer program product. Therefore, the embodiments of the present application can adopt a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present application can adopt the form of a computer program product implemented on one or more computer usable vehicles (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer usable program code.

[0139] The embodiments of the present application are described with reference to the flowchart illustrations and / or block diagrams of the methods, terminal devices (apparatus) and computer program products according to the embodiments of the present application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal devices to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal devices, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0140] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal devices to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0141] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal devices, so that a series of operational steps are performed on the computer or other programmable terminal devices to create a computer-implemented process, so that the instructions executed on the computer or other programmable terminal devices provide steps for implementing the function specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0142] Finally, it should also be noted that, in this document, the relationship terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. "And / or" indicates that any one of the two or both can be selected. Moreover, the term "comprise" includes "consist of", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or terminal device. Without more limitations, the element limited by the statement "comprise a…" does not exclude the presence of other identical elements in the process, method, article or terminal device including the element.

[0143] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for designing a wind turbine airfoil with a concave structure, characterized in that: include: Based on a preset circular pit parameter range, a plurality of different sets of target circular pit parameters are randomly generated; wherein the target circular pit parameters include at least a target pit depth-to-diameter ratio, a target pit spacing, and a target pit arrangement position corresponding to the plurality of pit structures; Arranging a pit structure on the suction surface of a smooth wind turbine airfoil model according to the target circular pit parameters to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters; Based on a first target pit-structure wind turbine airfoil corresponding to the target circular pit parameters, obtaining a lift-to-drag ratio parameter and a thrust coefficient corresponding to the first target pit-structure wind turbine airfoil; Obtaining an objective function value corresponding to the target circular dimple parameter based on the lift-to-drag ratio parameter and the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil; wherein a larger objective function value indicates a better target circular dimple parameter; According to the objective function value corresponding to the target circular pit parameter, the optimal circular pit parameter is obtained, and the second target pit structure wind turbine airfoil is generated according to the optimal circular pit parameter.

2. The method for designing a wind turbine airfoil with a concave structure according to claim 1, characterized in that: The method randomly generates multiple sets of different target circular pit parameters based on the preset circular pit parameter range, including: Generate a random target pit depth-to-diameter ratio based on a preset pit depth-to-diameter ratio range; Generate a random target pit spacing based on the preset pit spacing range; Based on the preset pit arrangement positions, a random target pit arrangement position is generated; wherein the target pit arrangement position represents a plurality of pit structures sequentially arranged at the center position of the suction surface of the smooth wind turbine airfoil model; The target pit depth-to-diameter ratio, target pit spacing, and target pit arrangement position are collectively taken as a set of target circular pit parameters, and multiple sets of different target circular pit parameters are generated.

3. The method for designing a wind turbine airfoil with a concave structure according to claim 1, characterized in that: The method of arranging a pit structure on the suction surface of a smooth wind turbine airfoil model according to the target circular pit parameters to obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters includes: Determining the center position of the pit arrangement on the suction surface of the smooth wind turbine airfoil model according to the target pit arrangement position in the target circular pit parameters; According to the target pit depth-to-diameter ratio and the target pit spacing in the target circular pit parameters, multiple pit structures are arranged at equal intervals on the suction surface of the smooth wind turbine airfoil model along the direction from the rear end to the front end of the smooth wind turbine airfoil model, and the center positions corresponding to the multiple pit structures after arrangement coincide with the center positions of the pit arrangements, thereby obtaining a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters.

4. The method for designing a wind turbine airfoil with a concave structure according to claim 1, wherein: The obtaining, based on the first target pit structure wind turbine airfoil corresponding to the target circular pit parameters, lift-to-drag ratio parameters and thrust coefficient corresponding to the first target pit structure wind turbine airfoil, includes: Simulating and running a first target concave-structure wind turbine airfoil corresponding to the target circular concave parameters to obtain lift and drag corresponding to the first target concave-structure wind turbine airfoil; Obtaining a lift coefficient corresponding to the first target pit-structure wind turbine airfoil according to the lift corresponding to the first target pit-structure wind turbine airfoil; Obtaining a drag coefficient corresponding to the first target pit-structure wind turbine airfoil according to the drag corresponding to the first target pit-structure wind turbine airfoil; Obtaining a lift-to-drag ratio parameter corresponding to the first target pit-structure wind turbine airfoil according to the lift coefficient and the drag coefficient corresponding to the first target pit-structure wind turbine airfoil; According to the lift coefficient and the drag coefficient corresponding to the first target pit-structure wind turbine airfoil, the thrust coefficient corresponding to the first target pit-structure wind turbine airfoil is obtained.

5. The method for designing a wind turbine airfoil with a concave structure according to claim 4, characterized in that: The obtaining, based on the lift corresponding to the first target pit-structure wind turbine airfoil, a lift coefficient corresponding to the first target pit-structure wind turbine airfoil includes: Determining a reference force based on a chord length corresponding to the wind turbine airfoil of the first target dimple structure, a fluid density during simulation operation, and a flow velocity; A lift coefficient corresponding to the first target pit-structure wind turbine airfoil is obtained according to the lift corresponding to the first target pit-structure wind turbine airfoil and the reference force.

6. The method for designing a wind turbine airfoil with a concave structure according to claim 4, characterized in that: The obtaining, based on the drag corresponding to the first target pit-structure wind turbine airfoil, a drag coefficient corresponding to the first target pit-structure wind turbine airfoil, includes: Determining a reference force based on a chord length corresponding to the wind turbine airfoil of the first target dimple structure, a fluid density during simulation operation, and a flow velocity; A drag coefficient corresponding to the first target pit-structure wind turbine airfoil is obtained according to the drag corresponding to the first target pit-structure wind turbine airfoil and the reference force.

7. The method for designing a wind turbine airfoil with a concave structure according to claim 4, characterized in that: The obtaining, according to the lift coefficient and the drag coefficient corresponding to the first target pit-structure wind turbine airfoil, a lift-to-drag ratio parameter corresponding to the first target pit-structure wind turbine airfoil includes: The lift coefficient corresponding to the first target pit structure wind turbine airfoil is used as the numerator, and the drag coefficient corresponding to the first target pit structure wind turbine airfoil is used as the denominator to obtain the lift-to-drag ratio parameter corresponding to the first target pit structure wind turbine airfoil.

8. The method for designing a wind turbine airfoil with a concave structure according to claim 4, characterized in that: The obtaining, according to the lift coefficient and the drag coefficient corresponding to the first target pit-structure wind turbine airfoil, of the thrust coefficient corresponding to the first target pit-structure wind turbine airfoil comprises: Obtaining a first sub-parameter corresponding to the inference coefficient according to a lift coefficient corresponding to the first target pit-structure wind turbine airfoil and an angle of attack corresponding to the first target pit-structure wind turbine airfoil; Obtaining a second sub-parameter corresponding to the inference coefficient according to a drag coefficient corresponding to the first target pit-structure wind turbine airfoil and an angle of attack corresponding to the first target pit-structure wind turbine airfoil; The thrust coefficient corresponding to the first target pit structure wind turbine airfoil is obtained according to the first sub-parameter and the second sub-parameter.

9. The method for designing a wind turbine airfoil with a concave structure according to claim 1, characterized in that: The obtaining, based on the lift-to-drag ratio parameters and the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil, the objective function value corresponding to the target circular dimple parameters includes: A lift-to-drag ratio parameter corresponding to the first target dimple structure wind turbine airfoil and the thrust coefficient are weightedly summed to obtain an objective function value corresponding to the target circular dimple parameter.

10. The method for designing a wind turbine airfoil with a concave structure according to claim 1, wherein: The obtaining of the optimal circular pit parameters according to the objective function value corresponding to the target circular pit parameters includes: According to the objective function value corresponding to the target circular pit parameter, the target circular pit parameter with the largest objective function value among all the target circular pit parameters is determined as the optimal circular pit parameter.

11. The method for designing a wind turbine airfoil with a concave structure according to claim 1, wherein: Also includes: Simulating and running a smooth wind turbine airfoil model to obtain a surface pressure of the smooth wind turbine airfoil model, and obtaining a simulated pressure distribution coefficient based on the surface pressure; Obtaining an actual pressure distribution coefficient corresponding to an actual model corresponding to the smooth wind turbine airfoil model; Obtaining a comprehensive error value between the simulated pressure distribution coefficient and the actual pressure distribution coefficient; In the case where the comprehensive error value is greater than the preset error threshold, the verification result corresponding to the smooth wind turbine airfoil model is generated to be unreasonable; When the comprehensive error value is less than or equal to the preset error threshold, the verification result corresponding to the smooth wind turbine airfoil model is generated to be reasonable.

12. The method for designing a wind turbine airfoil with a concave structure according to claim 11, characterized in that: The obtaining of the simulated pressure distribution coefficient according to the surface pressure includes: obtaining the simulated pressure distribution coefficient according to the surface pressure, the fluid density and the flow velocity during the simulation operation.

13. A device for designing wind turbine airfoil with a concave structure, characterized in that: include: a parameter generation module, configured to randomly generate a plurality of different sets of target circular pit parameters based on a preset circular pit parameter range; wherein the target circular pit parameters include at least a target pit depth-to-diameter ratio, a target pit spacing, and a target pit arrangement position corresponding to the plurality of pit structures; a pit structure arrangement module, configured to arrange a pit structure on the suction surface of the smooth wind turbine airfoil model according to the target circular pit parameters, and obtain a first target pit structure wind turbine airfoil corresponding to the target circular pit parameters; a performance parameter acquisition module, configured to acquire a lift-to-drag ratio parameter and a thrust coefficient corresponding to the first target pit-structure wind turbine airfoil corresponding to the target circular pit parameter; an objective function value acquisition module, configured to acquire an objective function value corresponding to the target circular dimple parameter based on the lift-to-drag ratio parameter and the thrust coefficient corresponding to the first target dimple structure wind turbine airfoil; wherein a larger objective function value indicates a more optimal target circular dimple parameter; The airfoil optimization module is used to obtain the optimal circular pit parameters according to the objective function value corresponding to the target circular pit parameters, and generate a second target pit structure wind turbine airfoil according to the optimal circular pit parameters.

14. An electronic device, characterized in that: The electronic device comprises a processor and a memory; the memory is used to store code instructions; the processor is used to run the code instructions, so that the electronic device executes the pit structure wind turbine airfoil design method according to any one of claims 1 to 12.

15. A computer-readable storage medium, characterized in that The method comprises computer instructions, which, when executed on an electronic device, enable the electronic device to execute the method for designing an airfoil of a wind turbine with a concave structure according to any one of claims 1 to 12.

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