Method and device for determining chord length and torsional angle, storage medium and electronic equipment

Abstract

The embodiment of the invention provides a chord length and torsional angle determination method and device, a storage medium and electronic equipment, and the method comprises the steps: determining the initial chord length and initial torsional angle of each section of a target blade; establishing a first function relation between the chord length of the target blade and the blade length and a second function relation between the torsion angle of the target blade and the blade length; and adjusting the initial chord length according to the first function relation so as to determine the target chord length of each section of the target blade, and adjusting the initial torsional angle according to the second function relation so as to determine the target torsional angle of each section of the target blade. According to the method, the problem that the chord length and the torsional angle of the blade of the straight wing section or the twisted wing section cannot improve the aerodynamic efficiency of the blade in the related technology can be solved.

Description

Technical Field

[0001] The present application relates to the field of wind turbine blades, and in particular, to a method and device for determining chord length and twist angle, a storage medium, and an electronic device. Background Art

[0002] In wind turbines, the chord length and twist angle of vertical axis wind turbine blades have a significant impact on their performance. The chord length refers to the length of the blade from the root to the tip, while the twist angle refers to the twisting angle of the blade in the air.

[0003] For vertical axis wind turbine blades, appropriate chord length and twist angle can improve the performance and efficiency of the blades. Generally, the chord length of the blade will gradually decrease as the distance from the center axis increases, which can reduce the wind resistance of the blade and increase the speed and output power of the wind turbine. At the same time, the appropriate twist angle can enable the blade to better capture wind energy during rotation, thereby improving the rotation efficiency of the wind turbine.

[0004] Traditional vertical axis blades mostly use straight wing sections or twisted wing sections, which have poor aerodynamic efficiency.

[0005] With regard to the problem in the related art that the chord length and twist angle of the blades of the straight wing section or the twisted wing section cannot improve the aerodynamic efficiency of the blades, no effective solution has been proposed so far.

[0006] Therefore, it is necessary to improve the related technology to overcome the above-mentioned defects in the related technology. Summary of the invention

[0007] The embodiments of the present application provide a method and device for determining chord length and twist angle, a storage medium and an electronic device, so as to at least solve the problem in the related art that the chord length and twist angle of the blade of a straight wing section or a twisted wing section cannot improve the aerodynamic efficiency of the blade.

[0008] According to one embodiment of the present application, a method for determining chord length and twist angle is provided, including: determining an initial chord length and an initial twist angle of each cross section of a target blade; establishing a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length; adjusting the initial chord length according to the first functional relationship to determine a target chord length of each cross section of the target blade, and adjusting the initial twist angle according to the second functional relationship to determine a target twist angle of each cross section of the target blade.

[0009] In an exemplary embodiment, a first functional relationship between the chord length and the blade length of the target blade is established, including: obtaining multiple aerodynamic performance parameters of the target blade under multiple operating conditions, wherein the rotation speed, inflow angle and Reynolds number corresponding to each operating condition are different; and fitting the first functional relationship and the second functional relationship according to the multiple aerodynamic performance parameters.

[0010] In an exemplary embodiment, the initial chord length is adjusted according to the first functional relationship to determine the target chord length of each cross section of the target blade, and the initial twist angle is adjusted according to the second functional relationship to determine the target twist angle of each cross section of the target blade, including: correcting the first coefficient in the first functional relationship according to the target aerodynamic performance parameter corresponding to the target blade, and correcting the second coefficient in the second functional relationship; adjusting the initial chord length according to the corrected first functional relationship to generate the target chord length, and adjusting the initial twist angle according to the corrected second functional relationship to generate the target twist angle.

[0011] In an exemplary embodiment, after adjusting the initial chord length according to the first functional relationship to determine the target chord length of each section of the target blade, and adjusting the initial torsion angle according to the second functional relationship to determine the target torsion angle of each section of the target blade, the method further includes: performing a smoothness check on the target blade including the target chord length and the target torsion angle; when it is determined that the target blade fails the smoothness check, determining a blade range that fails the smoothness check in the target blade, and determining each target chord length and target torsion angle for each section included in the blade range; and updating each target chord length and each target torsion angle of each section so that the target blade after updating each target chord length and each target torsion angle passes the smoothness check.

[0012] In an exemplary embodiment, after adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and adjusting the initial torsion angle according to the second functional relationship to determine the target torsion angle of each cross section of the target blade, the method further includes: creating a three-dimensional model corresponding to the target blade according to the target chord length and the target torsion angle; determining the stress and strain of each part of the three-dimensional model under multiple working conditions, and determining the deformation of the three-dimensional model under each working condition based on the stress and strain; determining whether the deformation meets the preset structural requirements of the target blade; and when it is determined that the deformation meets the preset structural requirements, determining that the blade structure of the target blade including the target chord length and the target torsion angle is valid.

[0013] In an exemplary embodiment, after adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and adjusting the initial twist angle according to the second functional relationship to determine the target twist angle of each cross section of the target blade, the method also includes: creating a three-dimensional model corresponding to the target blade according to the target chord length and the target twist angle; determining the lift and drag of the three-dimensional model under multiple operating conditions; determining the lift-to-drag ratio corresponding to the three-dimensional model according to the lift and the drag; determining the blade efficiency of the three-dimensional model according to the lift-to-drag ratio; if it is determined that the blade efficiency meets the preset blade efficiency, determining that updating the target chord length and the target twist angle is not allowed; if it is determined that the blade efficiency does not meet the preset blade efficiency, determining that updating the target chord length and the target twist angle is allowed.

[0014] According to another embodiment of the present application, a device for determining chord length and torsion angle is provided, including: a determination module for determining the initial chord length and initial torsion angle of each cross section of a target blade; an establishment module for establishing a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the torsion angle of the target blade and the blade length; an adjustment module for adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and adjusting the initial torsion angle according to the second functional relationship to determine the target torsion angle of each cross section of the target blade.

[0015] According to another embodiment of the present application, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when run.

[0016] According to another embodiment of the present application, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0017] According to another embodiment of the present application, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0018] Through the embodiment of the present application, the initial chord length and initial twist angle of each cross section of the target blade are determined; a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length are established; the initial chord length is adjusted according to the first functional relationship to determine the target chord length of each cross section of the target blade, and the initial twist angle is adjusted according to the second functional relationship to determine the target twist angle of each cross section of the target blade. That is to say, the embodiment of the present application adjusts the initial chord length and initial twist angle of each cross section of the target blade through the first functional relationship between the chord length of the target blade and the blade length and the second functional relationship between the twist angle of the target blade and the blade length to determine the target chord length and target twist angle of each cross section of the target blade. Through the embodiment of the present application, the problem in the related art that the chord length and twist angle of the blade of the straight wing section or the twisted wing section cannot improve the aerodynamic efficiency of the blade can be solved, and then the starting efficiency of the target blade is improved by determining the chord length and twist angle of each cross section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 It is a hardware structure block diagram of a computer terminal device for a method for determining a chord length and a torsion angle according to an embodiment of the present application;

[0022] Figure 2 is a flow chart of a method for determining chord length and torsion angle according to an embodiment of the present application;

[0023] Figure 3 is a schematic diagram of a vertical axis blade with three-dimensional changes in airfoil chord length and twist angle according to an optional embodiment of the present application;

[0024] Figure 4 is a partial schematic diagram of a blade according to an optional embodiment of the present application;

[0025] Figure 5 is a schematic diagram of a polynomial function relationship according to an optional embodiment of the present application;

[0026] Figure 6 It is a structural block diagram of a device for determining chord length and torsion angle according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0029] The method embodiments provided in the embodiments of the present application can be executed in a computer terminal device or a similar computing device. Taking running on a computer terminal device as an example, Figure 1 1 is a hardware structure block diagram of a computer terminal device for determining a chord length and a torsion angle according to an embodiment of the present application. Figure 1 As shown, the computer terminal device may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the above-mentioned computer terminal device may also include a transmission device 106 and an input and output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above-mentioned computer terminal device. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0030] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the method for determining the chord length and torsion angle in the embodiment of the present application. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the computer terminal device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0031] The transmission device 106 is used to receive or send data via a network. The above-mentioned network specific examples may include a wireless network provided by a communication provider of a computer terminal device. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0032] In this embodiment, a method for determining chord length and torsion angle is provided. Figure 2 is a flow chart of a method for determining chord length and torsion angle according to an embodiment of the present application, such as Figure 2 As shown, the process includes the following steps:

[0033] Step S202, determining an initial chord length and an initial twist angle of each cross section of the target blade;

[0034] Step S204, establishing a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length;

[0035] Step S206, adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and adjusting the initial twist angle according to the second functional relationship to determine the target twist angle of each cross section of the target blade.

[0036] Through the above steps, the initial chord length and initial twist angle of each cross section of the target blade are determined; a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length are established; the initial chord length is adjusted according to the first functional relationship to determine the target chord length of each cross section of the target blade, and the initial twist angle is adjusted according to the second functional relationship to determine the target twist angle of each cross section of the target blade. That is to say, the embodiment of the present application adjusts the initial chord length and initial twist angle of each cross section of the target blade through the first functional relationship between the chord length of the target blade and the blade length and the second functional relationship between the twist angle of the target blade and the blade length to determine the target chord length and target twist angle of each cross section of the target blade. Through the embodiment of the present application, the problem in the related art that the chord length and twist angle of the blade of the straight wing section or the twisted wing section cannot improve the aerodynamic efficiency of the blade can be solved, and then the starting efficiency of the target blade is improved by determining the chord length and twist angle of each cross section.

[0037] Optionally, the above-mentioned step S204 of establishing a first functional relationship between the chord length and the blade length of the target blade includes: obtaining multiple aerodynamic performance parameters of the target blade under multiple operating conditions, wherein the rotation speed, inflow angle and Reynolds number corresponding to each operating condition are different; and fitting the first functional relationship and the second functional relationship according to the multiple aerodynamic performance parameters.

[0038] It is understandable that, through the aerodynamic performance parameters of the blade under different working conditions, the mathematical relationship between the chord length and the blade length, i.e. the first functional relationship, and the mathematical relationship between the twist angle and the blade length, i.e. the second functional relationship, can be established. Specifically:

[0039] Obtain the aerodynamic performance parameters of the target blade.

[0040] Each operating condition is composed of different rotation speeds (N), inflow angles (β) and Reynolds numbers (Re). These operating conditions should cover various wind speeds and directions that the blades may encounter in actual operation.

[0041] Collect data from simulation or experiment.

[0042] Through computer fluid dynamics (CFD) simulation software or wind tunnel experiments, the aerodynamic performance parameters of the target blade under each defined working condition, such as lift coefficient (CL), drag coefficient (CD), torque coefficient (Ct), etc., are obtained.

[0043] Fit the first and second functional relationships.

[0044] Select mathematical model: Based on the preliminary analysis, select appropriate mathematical models to describe the relationship between chord length (c) and blade length (L), and the relationship between twist angle (α) and blade length (L). These models are usually polynomial functions.

[0045] Data fitting: The aerodynamic performance parameters collected above are processed using mathematical fitting methods, such as the least squares method, genetic algorithm, particle swarm optimization (PSO), etc. The relationship between the chord length and twist angle of each section under different working conditions and the performance parameters is analyzed to find the best coefficient set, so that the fitted function relationship can accurately reflect the law of change of the aerodynamic performance of the blade.

[0046] Verify the functional relationship: Use an independent data set that is not involved in the fitting process to verify the accuracy and applicability of the established first and second functional relationships.

[0047] Optimization iteration: Based on the verification results, it may be necessary to adjust the complexity of the model or optimize the parameters of the algorithm, and re-fit and verify until the prediction accuracy of the model meets the design requirements.

[0048] Through the above steps, the ultimate goal is to establish a mathematical model that can predict the optimal chord length and twist angle configuration based on the blade length, so that the blade can exhibit the best aerodynamic performance and efficiency under different operating conditions.

[0049] Optionally, the above-mentioned step S206 adjusts the initial chord length according to the first functional relationship to determine the target chord length of each cross-section of the target blade, and adjusts the initial torsion angle according to the second functional relationship to determine the target torsion angle of each cross-section of the target blade, including: correcting the first coefficient in the first functional relationship according to the target aerodynamic performance parameter corresponding to the target blade, and correcting the second coefficient in the second functional relationship; adjusting the initial chord length according to the corrected first functional relationship to generate the target chord length, and adjusting the initial torsion angle according to the corrected second functional relationship to generate the target torsion angle.

[0050] It is understandable that the above technical solution involves a method for optimizing blade design parameters, specifically, by adjusting and optimizing the coefficients in the functional relationship to achieve the purpose of optimizing the target blade chord length and twist angle, thereby improving its aerodynamic performance. Specifically:

[0051] Initial parameter setting: Set an initial chord length and initial twist angle for each section of the blade. These initial values ​​may be based on existing design experience, theoretical calculations, or preliminary simulation results.

[0052] Establishing functional relationships: Establish two functional relationships to describe the relationship between the chord length and the twist angle with the blade length. These two relationships are usually in the form of polynomials.

[0053] Target aerodynamic performance parameter determination: Set one or more target aerodynamic performance parameters, such as lift-to-drag ratio, torque coefficient or efficiency index.

[0054] Coefficient correction and parameter adjustment: Coefficient correction, first functional relationship correction: According to the aerodynamic performance parameters of the target blade in simulation or other tests, the first coefficient in the first functional relationship is corrected.

[0055] Correction of the second functional relationship: Similarly, the second coefficient in the second functional relationship is corrected according to the aerodynamic performance parameters.

[0056] The purpose of coefficient correction is to adjust the shape of the polynomial function so that the calculated chord length and twist angle match the optimal aerodynamic performance parameters.

[0057] Parameter adjustment: According to the modified first functional relationship (the relationship between chord length and blade length), the initial chord length of each section of the blade is adjusted to calculate the target chord length.

[0058] According to the modified second functional relationship (the relationship between the twist angle and the blade length), the initial twist angle of each section of the blade is adjusted and the target twist angle is calculated.

[0059] The target chord length and target twist angle are calculated based on the optimized coefficients, aiming to further improve the aerodynamic performance of the blade.

[0060] Iterative optimization: The above coefficient correction and parameter adjustment may need to be completed through multiple iterations. After each iteration, the aerodynamic performance simulation or test is repeated, and the coefficients are corrected again according to the results until a satisfactory optimization goal is achieved.

[0061] Result verification: After the optimization process is completed, the aerodynamic performance of the blade under the target chord length and target twist angle needs to be verified through simulation or physical testing to ensure that it meets or exceeds the predetermined goals.

[0062] Through the above steps, the chord length and twist angle configuration of the blade can be systematically optimized to improve the aerodynamic performance of the wind turbine blade. This not only involves precise adjustment of the coefficients of the functional relationship, but also requires multiple iterations and verifications to ensure that the final design can effectively improve the performance of the blade and maintain stability and reliability under various working conditions.

[0063] Optionally, after adjusting the initial chord length according to the first functional relationship to determine the target chord length of each section of the target blade, and adjusting the initial torsion angle according to the second functional relationship to determine the target torsion angle of each section of the target blade in the above step S206, the method further includes: performing a smoothness check on the target blade including the target chord length and the target torsion angle; when it is determined that the target blade fails the smoothness check, determining a blade range that fails the smoothness check in the target blade, and determining each target chord length and target torsion angle of each section included in the blade range; and updating each target chord length and each target torsion angle of each section so that the target blade after updating each target chord length and each target torsion angle passes the smoothness check.

[0064] It is understood that during the blade design process, the target blade including the target chord length and target twist angle is checked for smoothness, and the design can be adjusted if the check fails. The smoothness check is mainly to ensure that the geometric shape of the blade is smooth and continuous, without sudden or unreasonable shape changes, as this may affect the aerodynamic performance and structural stability of the blade. Specifically:

[0065] Smoothness check: define smoothness standards, which usually include requirements for the continuity of the blade cross-sectional shape and avoidance of local geometric mutations. These standards may involve restrictions on the rate of change of chord length and torsion angle, as well as requirements for the smoothness of the blade surface curvature.

[0066] Check blade design: Use design software or specialized analysis tools to check the geometry of the target blade, with a focus on checking the smoothness of the chord length and twist angle as the blade span (from root to tip) changes.

[0067] Adjustment of failed smoothness check: Identify the problem area. If the smoothness check shows that the blade design has unreasonable or unsmooth geometric changes in certain areas, it is necessary to identify the blade range that failed the check. This usually involves a specific section or segment of the blade where the rate of change of the chord length and / or the twist angle exceeds the smoothness standard. Analyze the cause of the problem and conduct an in-depth analysis of the blade range that failed the check to find out the specific reasons for the abnormal rate of change of the chord length and twist angle. This may be related to sudden changes in design parameters, limitations of the calculation model, or conflicts between design goals. Parameter update and adjustment: For each section that failed the smoothness check, update the target chord length and target twist angle to reduce the rate of change of the chord length and twist angle. This may involve fine-tuning the coefficients of the polynomial function to ensure that the changes in the chord length and twist angle are smoother and meet the smoothness standards. Re-check and verify: After updating the design parameters, re-perform the smoothness check to verify whether the blade design meets all smoothness standards. If the check still fails, it may be necessary to iterate the above process again until all blade ranges pass the smoothness check.

[0068] Simulation and test verification: After passing the smoothness check, aerodynamic performance simulation or physical testing should be carried out to ensure that the adjusted design is not only smooth but also able to maintain or improve the expected performance of the blade.

[0069] Smoothness check is an important part of blade design, which aims to ensure that the blade geometry is smooth and continuous to optimize aerodynamic performance and structural stability. If problems are found during the inspection, they should be solved by fine-tuning design parameters (such as chord length and twist angle) to ensure that the design meets the smoothness standards. This process may require multiple iterations, using simulation and testing to verify the adjustment effect until the blade design reaches the optimal state.

[0070] Optionally, after adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade in the above-mentioned step S206, and adjusting the initial torsion angle according to the second functional relationship to determine the target torsion angle of each cross section of the target blade, the method further includes: creating a three-dimensional model corresponding to the target blade according to the target chord length and the target torsion angle; determining the stress and strain of each part of the three-dimensional model under multiple working conditions, and determining the deformation of the three-dimensional model under each working condition based on the stress and strain; determining whether the deformation condition meets the preset structural requirements of the target blade; when it is determined that the deformation condition meets the preset structural requirements, determining that the blade structure of the target blade including the target chord length and the target torsion angle is valid.

[0071] It can be understood that the steps of creating a three-dimensional model corresponding to the target blade according to the determined target chord length and target twist angle and performing structural strength analysis include:

[0072] Create a three-dimensional model: CAD (Computer Aided Design) software can be used to create a three-dimensional structural model of the target blade based on the parameters of the target chord length and the target twist angle.

[0073] Material property definition: Specify material properties for the blades in the 3D model, including but not limited to elastic modulus, Poisson's ratio, density, etc. These properties will be used in finite element analysis.

[0074] Structural strength analysis: Import the created 3D model into finite element analysis (FEA) software to prepare for structural strength analysis.

[0075] Meshing: In FEA software, the 3D model is meshed to create a finite element mesh. The size and density of the mesh should be determined based on the accuracy requirements of the analysis and the computing resources.

[0076] Set boundary conditions: According to the installation method and expected operating conditions of the blade, set the boundary conditions of the model, such as fixed constraints at the root of the blade, to simulate the actual installation and operation conditions.

[0077] Apply loads: Apply expected operating loads to the model, including wind loads, blade deadweight, centrifugal force, etc., to ensure that the loads under each operating condition are reasonably considered.

[0078] Perform static structural analysis: Run FEA software to perform static structural analysis to calculate the stress, strain and deformation of the model under various loads. This will provide structural response data of the blade under different working conditions.

[0079] Analysis result check: Check the analysis results, especially the stress and strain distribution of the model, as well as the deformation under different working conditions, to ensure that they are within the safety range and do not exceed the allowable stress and strain of the material.

[0080] Comparison with preset structural requirements: Compare the deformation in the analysis results with the preset structural requirements, which may include maximum allowable deformation, minimum stiffness requirements, etc., to evaluate whether the model meets the designed structural strength and stability requirements.

[0081] Confirm that the blade structure is valid: If the deformation of the model meets the preset structural requirements and the stress and strain are within the safe range, it can be preliminarily determined that the blade design structure including the target chord length and target twist angle is valid.

[0082] Iterative optimization: If any part of the model is found not to meet the structural requirements, go back to the design stage, adjust the chord length, twist angle or add reinforcement structure, and then re-perform FEA analysis until all structural requirements are met.

[0083] Test verification: After FEA analysis shows that the design is valid, a physical model of the blade is manufactured for test verification. This may include static load testing, fatigue testing, etc. to further confirm the stability and reliability of the design.

[0084] Combining the results of FEA analysis and physical testing, it is finally confirmed whether the blade design meets all structural and performance requirements. If confirmed to be valid, it can be advanced to the manufacturing and installation stage.

[0085] Through the above steps, the design of the target blade is not only optimized in terms of aerodynamic performance, but its structural strength and deformation are also verified, ensuring that the blade can withstand various loads in actual operation while maintaining its expected aerodynamic performance.

[0086] Optionally, after adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade in the above step S206, and adjusting the initial torsion angle according to the second functional relationship to determine the target torsion angle of each cross section of the target blade, the method further includes: creating a three-dimensional model corresponding to the target blade according to the target chord length and the target torsion angle; determining the lift and drag of the three-dimensional model under multiple working conditions; determining the lift-to-drag ratio corresponding to the three-dimensional model according to the lift and the drag; determining the blade efficiency of the three-dimensional model according to the lift-to-drag ratio; when it is determined that the blade efficiency meets the preset blade efficiency, determining that updating the target chord length and the target torsion angle is not allowed; when it is determined that the blade efficiency does not meet the preset blade efficiency, determining that updating the target chord length and the target torsion angle is allowed.

[0087] It is understandable that the above technical solution involves the process of creating a three-dimensional model of the blade using the target chord length and the target twist angle, and optimizing the blade design by evaluating the aerodynamic performance under multiple working conditions. Specifically:

[0088] Create a 3D model: Use computer-aided design (CAD) software, such as SolidWorks, CATIA, etc., to create a 3D model of the target blade based on the target chord length and target twist angle. Ensure that the geometry and size of the model match the design parameters.

[0089] Determine lift and drag: Import the 3D model into computational fluid dynamics (CFD) software, such as ANSYS F luent, Star-CCM+, etc., to perform aerodynamic performance simulation to simulate the lift (L) and drag (D) of the blade under different working conditions (wind speed, wind direction, etc.).

[0090] Set up simulation conditions: Define a series of operating parameters that represent the actual operating environment of the blade, including wind speed, wind direction, temperature, humidity, etc., to comprehensively evaluate the aerodynamic performance of the blade.

[0091] Calculate lift-to-drag ratio and blade efficiency: Use the ratio of lift (L) to drag (D) to calculate the lift-to-drag ratio (L / D). The lift-to-drag ratio is an important indicator of the aerodynamic performance of the blade. A higher lift-to-drag ratio means that the blade can more effectively reduce drag while generating lift, improving its overall performance.

[0092] Blade efficiency assessment: Blade efficiency is another key indicator, usually related to the lift-to-drag ratio, which indicates the efficiency of the blade in converting wind energy into mechanical energy. Blade efficiency can be calculated through parameters such as torque coefficient (Ct) and power coefficient (Cp).

[0093] Verify that blade efficiency meets preset values: Set a target value for blade efficiency, which is determined based on wind turbine performance requirements and industry standards.

[0094] Efficiency comparison and judgment: Compare the calculated blade efficiency with the preset blade efficiency to determine whether the blade design meets or exceeds the preset efficiency standard.

[0095] Update judgment of chord length and twist angle: If the blade efficiency does not meet the preset blade efficiency, this indicates that the current design parameters (chord length and twist angle) may not be optimal and the parameters need to be adjusted to optimize the aerodynamic performance.

[0096] Parameter update: allows updating of chord length and twist angle. By adjusting these parameters, the 3D model is recreated and CFD simulation is performed to find design solutions that can improve blade efficiency.

[0097] Determine the non-update condition: If the blade efficiency has reached or exceeded the preset blade efficiency, it means that the current chord length and twist angle configuration are sufficiently optimized.

[0098] This process involves creating a three-dimensional model of the blade using the target chord length and target twist angle, and using CFD simulation to evaluate its lift, drag and efficiency under different working conditions, and then decide whether the design parameters need to be updated to achieve the preset blade efficiency. By iteratively optimizing the chord length and twist angle, it can ensure that the wind turbine blades meet the aerodynamic performance requirements while also having high structural efficiency and reliability.

[0099] In order to better understand the process of the above-mentioned method for determining the chord length and the torsion angle, the implementation method flow of the above-mentioned method for determining the chord length and the torsion angle is described below in combination with an optional embodiment, but it is not used to limit the technical solution of the embodiment of the present application.

[0100] When designing vertical axis wind turbine blades, it is necessary to reasonably select the variation of chord length and twist angle to ensure that the blades can effectively rotate and convert into electrical energy under the action of wind. At the same time, factors such as the material and structure of the blades need to be considered to ensure the strength and stability of the blades. By optimizing the design of the chord length and twist angle variation of the blades, the overall performance and efficiency of the wind turbine can be improved.

[0101] Traditional vertical axis blades mostly use straight wing sections or twisted wing sections, and have poor aerodynamic efficiency. The optional embodiment of the present application proposes a vertical axis blade with three-dimensional changes in airfoil chord length and twist angle, which can significantly improve the aerodynamic efficiency of the blade and reduce the blade load.

[0102] Figure 3 is a schematic diagram of a vertical-axis blade with three-dimensional changes in airfoil chord length and twist angle according to an optional embodiment of the present application, Figure 4 is a partial schematic diagram of a blade according to an optional embodiment of the present application, such as Figure 3 , Figure 4 As shown:

[0103] 1. The chord length and twist angle of the airfoil change with the three-dimensional twisting of the blade in the span direction.

[0104] 2. The chord length and twist angle of the airfoil are related to the Reynolds number, rotation speed, and inflow angle of the section where the airfoil is located, and are a functional relationship with the incoming flow conditions. Among them, the functional relationship is: f(c, α) ~ f(Re, N, β); c: airfoil chord length; α: airfoil twist angle; Re: Reynolds number; N: wind rotor speed; β: airfoil inflow angle.

[0105] 3. Figure 5 is a schematic diagram of a polynomial function relationship according to an optional embodiment of the present application, such as Figure 5 As shown, the chord length of the airfoil and the blade length are in a polynomial function relationship, and the twist angle of the airfoil and the blade length are also in a polynomial function relationship.

[0106] 4. Simulate and determine the polynomial and the optimization process of the coefficients of the polynomial.

[0107] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0108] In this embodiment, a device for determining chord length and torsion angle is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and will not be repeated hereafter. As used below, the term "module" may be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0109] Figure 6 is a structural block diagram of a device for determining chord length and torsion angle according to an embodiment of the present application, such as Figure 6 As shown, the device comprises:

[0110] A determination module 62, for determining an initial chord length and an initial twist angle of each cross section of the target blade;

[0111] An establishing module 64 is used to establish a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length;

[0112] The adjustment module 66 is used to adjust the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and to adjust the initial twist angle according to the second functional relationship to determine the target twist angle of each cross section of the target blade.

[0113] Through the above-mentioned device, the initial chord length and initial twist angle of each cross section of the target blade are determined; a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length are established; the initial chord length is adjusted according to the first functional relationship to determine the target chord length of each cross section of the target blade, and the initial twist angle is adjusted according to the second functional relationship to determine the target twist angle of each cross section of the target blade. That is to say, the embodiment of the present application adjusts the initial chord length and initial twist angle of each cross section of the target blade through the first functional relationship between the chord length of the target blade and the blade length and the second functional relationship between the twist angle of the target blade and the blade length to determine the target chord length and target twist angle of each cross section of the target blade. Through the embodiment of the present application, the problem in the related art that the chord length and twist angle of the blade of the straight wing section or the twisted wing section cannot improve the aerodynamic efficiency of the blade can be solved, and then the starting efficiency of the target blade is improved by determining the chord length and twist angle of each cross section.

[0114] In an exemplary embodiment, the establishment module 64 is also used to obtain multiple aerodynamic performance parameters of the target blade under multiple operating conditions, wherein the rotation speed, inflow angle and Reynolds number corresponding to each operating condition are different; and the first functional relationship and the second functional relationship are fitted according to the multiple aerodynamic performance parameters.

[0115] In an exemplary embodiment, the adjustment module 66 is also used to correct the first coefficient in the first functional relationship according to the target aerodynamic performance parameter corresponding to the target blade, and to correct the second coefficient in the second functional relationship; to adjust the initial chord length according to the corrected first functional relationship to generate the target chord length, and to adjust the initial torsion angle according to the corrected second functional relationship to generate the target torsion angle.

[0116] In an exemplary embodiment, the adjustment module 66 is also used to perform a smoothness check on the target blade including the target chord length and the target torsion angle; when it is determined that the target blade has not passed the smoothness check, determine a blade range that has not passed the smoothness check in the target blades, and determine each target chord length and target torsion angle of each section included in the blade range; and update each target chord length and each target torsion angle of each section so that the target blade after updating each target chord length and each target torsion angle passes the smoothness check.

[0117] In an exemplary embodiment, the adjustment module 66 is also used to create a three-dimensional model corresponding to the target blade based on the target chord length and the target torsion angle; determine the stress and strain of each part of the three-dimensional model under multiple working conditions, and determine the deformation of the three-dimensional model under each working condition based on the stress and strain; determine whether the deformation meets the preset structural requirements of the target blade; if it is determined that the deformation meets the preset structural requirements, determine that the blade structure of the target blade including the target chord length and the target torsion angle is valid.

[0118] In an exemplary embodiment, the adjustment module 66 is further used to create a three-dimensional model corresponding to the target blade based on the target chord length and the target twist angle; determine the lift and drag of the three-dimensional model under multiple operating conditions; determine the lift-to-drag ratio corresponding to the three-dimensional model based on the lift and the drag; determine the blade efficiency of the three-dimensional model based on the lift-to-drag ratio; if it is determined that the blade efficiency meets the preset blade efficiency, determine that updating the target chord length and the target twist angle is not allowed; if it is determined that the blade efficiency does not meet the preset blade efficiency, determine that updating the target chord length and the target twist angle is allowed.

[0119] It should be noted that the above modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0120] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0121] Optionally, in this embodiment, the storage medium may be configured to store program codes for executing the following steps:

[0122] S1, determine the initial chord length and initial twist angle of each section of the target blade;

[0123] S2, establishing a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length;

[0124] S3, adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and adjusting the initial twist angle according to the second functional relationship to determine the target twist angle of each cross section of the target blade.

[0125] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0126] An embodiment of the present application further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0127] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0128] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0129] S1, determine the initial chord length and initial twist angle of each section of the target blade;

[0130] S2, establishing a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length;

[0131] S3, adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and adjusting the initial twist angle according to the second functional relationship to determine the target twist angle of each cross section of the target blade.

[0132] An embodiment of the present application further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps in any one of the above method embodiments are implemented.

[0133] An embodiment of the present application further provides another computer program product, including a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0134] An embodiment of the present application also provides a computer program, which includes computer instructions, which are stored in a computer-readable storage medium; a processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the steps in any one of the above method embodiments.

[0135] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0136] S1, determine the initial chord length and initial twist angle of each section of the target blade;

[0137] S2, establishing a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length;

[0138] S3, adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and adjusting the initial twist angle according to the second functional relationship to determine the target twist angle of each cross section of the target blade.

[0139] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0140] Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that herein, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.

[0141] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining chord length and torsion angle, characterized in that: include: Determine the initial chord length and initial twist angle of each cross section of the target blade; Establishing a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length; The initial chord length is adjusted according to the first functional relationship to determine the target chord length of each cross section of the target blade, and the initial twist angle is adjusted according to the second functional relationship to determine the target twist angle of each cross section of the target blade.

2. The method according to claim 1, characterized in that Establishing a first functional relationship between the chord length and the blade length of the target blade includes: Acquiring a plurality of aerodynamic performance parameters of the target blade under a plurality of operating conditions, wherein the rotation speed, inflow angle and Reynolds number corresponding to each operating condition are different; The first functional relationship and the second functional relationship are fitted according to the plurality of aerodynamic performance parameters.

3. The method according to claim 1, characterized in that: The initial chord length is adjusted according to the first functional relationship to determine a target chord length of each cross section of the target blade, and the initial twist angle is adjusted according to the second functional relationship to determine a target twist angle of each cross section of the target blade, including: Correcting the first coefficient in the first functional relationship according to the target aerodynamic performance parameter corresponding to the target blade, and correcting the second coefficient in the second functional relationship; The initial chord length is adjusted according to the modified first functional relationship to generate the target chord length, and the initial torsion angle is adjusted according to the modified second functional relationship to generate the target torsion angle.

4. The method according to claim 1, characterized in that After adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and adjusting the initial twist angle according to the second functional relationship to determine the target twist angle of each cross section of the target blade, the method further includes: Performing a smoothness check on a target blade including the target chord length and the target twist angle; In the case where it is determined that the target blade fails the smoothness check, determining a blade range that fails the smoothness check in the target blade, and determining each target chord length and target twist angle of each cross section included in the blade range; Each target chord length and each target twist angle of each cross section are updated so that the target blade after updating each target chord length and each target twist angle passes the smoothness inspection.

5. The method according to claim 1, characterized in that After adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and adjusting the initial twist angle according to the second functional relationship to determine the target twist angle of each cross section of the target blade, the method further includes: Creating a three-dimensional model corresponding to the target blade according to the target chord length and the target twist angle; Determining stress and strain of various parts of the three-dimensional model under multiple working conditions, and determining the deformation of the three-dimensional model under each working condition based on the stress and strain; Determining whether the deformation condition meets the preset structural requirements of the target blade; When it is determined that the deformation condition meets the preset structural requirement, it is determined that the blade structure of the target blade including the target chord length and the target twist angle is valid.

6. The method according to claim 1, characterized in that After adjusting the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and adjusting the initial twist angle according to the second functional relationship to determine the target twist angle of each cross section of the target blade, the method further includes: Creating a three-dimensional model corresponding to the target blade according to the target chord length and the target twist angle; determining lift and drag of the three-dimensional model under multiple operating conditions; determining a lift-to-drag ratio corresponding to the three-dimensional model according to the lift and the drag; determining a blade efficiency of the three-dimensional model according to the lift-to-drag ratio; In the case where it is determined that the blade efficiency meets the preset blade efficiency, determining that updating the target chord length and the target twist angle is not allowed; When it is determined that the blade efficiency does not meet the preset blade efficiency, it is determined that updating of the target chord length and the target twist angle is allowed.

7. A device for determining chord length and torsion angle, characterized in that: include: A determination module, used for determining an initial chord length and an initial twist angle of each cross section of a target blade; An establishing module, used to establish a first functional relationship between the chord length of the target blade and the blade length and a second functional relationship between the twist angle of the target blade and the blade length; An adjustment module is used to adjust the initial chord length according to the first functional relationship to determine the target chord length of each cross section of the target blade, and to adjust the initial twist angle according to the second functional relationship to determine the target twist angle of each cross section of the target blade.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method of any one of claims 1 to 6 when executed.

9. An electronic device, comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to execute the method according to any one of claims 1 to 6 through the computer program.

10. A computer program product, comprising a computer program, characterized in that The computer program is used by a processor to execute the steps of the method described in any one of claims 1 to 6.

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