Gas compressor rotor-oriented gap leakage flow simulation method and device, computer equipment and medium
By setting a preset grid in the compressor rotor blade tip gap region, determining the influence relationship and generating a scaled simulation model, the contradiction between the calculation efficiency and accuracy of compressor rotor blade tip gap leakage flow simulation is resolved, and efficient and accurate leakage flow simulation is achieved with fewer grids.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-04-10
AI Technical Summary
In existing technologies, there is a trade-off between efficiency and accuracy in the simulation calculation of compressor rotor blade tip clearance leakage flow, making it impossible to achieve accurate leakage flow simulation while taking into account computational efficiency.
By setting a preset number of grids in the blade tip gap region, the influence relationship between blade-related velocity, temperature, and pressure and the gap reduction ratio is determined, a proportional simulation model is generated, the blade tip gap reduction ratio is output, and grids are set in the reduced gap region to perform gas flow numerical simulation.
This approach improves the accuracy and efficiency of gap leakage flow simulation with fewer grid cells, ensuring that the simulation results meet the preset accuracy.
Smart Images
Figure CN121835478A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of compressors, in particular to a simulation method and device for tip clearance leakage flow of a compressor rotor, a computer device and a medium. BACKGROUND
[0002] In order to avoid friction between the compressor rotor blade and the casing, a certain amount of gap value is usually left between the two, so the loss caused by the tip clearance (one of the components of an aero-engine is a compressor rotor composed of circumferentially uniformly distributed blades, when the blades rotate, the blades need to maintain a certain distance from the casing shell outside the engine, the tip clearance is the gap between the compressor blade and the surrounding casing, as shown in Figure 1 The tip clearance loss of the compressor accounts for one third of the total loss, and it also plays an important role in the occurrence of compressor stall.
[0003] In the numerical simulation calculation process of compressor rotor gas flow, the flow area is divided into a large number of grids connected by points, the more the number of grids, the closer the calculation result to the actual situation, until the calculation result no longer changes, but the more the number of grids, the lower the calculation efficiency, in order to improve the calculation efficiency, usually do not place too many grids in the tip clearance area, but in this case, the simulation result of the tip clearance leakage flow (tip clearance leakage flow refers to the flow of high-pressure air that has been compressed through the tip clearance from the pressure surface of the blade to the suction surface of the blade, as shown in Figure 1 The distance from the leading edge to the trailing edge of the compressor blade section is the chord length) is larger than the actual value, and the tip clearance leakage flow has a great influence on the performance of the compressor, thereby indirectly leading to the difference between the numerical simulation of the compressor and the actual situation; but placing too many grids, especially in the case of multiple rows of blades, the number of grids doubles, leading to exponential decline in calculation efficiency. Therefore, there is a contradiction between filling too many grids in the tip clearance based on calculation efficiency and filling enough grids for accurate simulation of tip clearance leakage flow.
[0004] For rotor simulation with tip clearance, the existing technology proposes a tip "shooting" model, as shown in Figure 2 However, this model does not allow the leakage flow to be compressed into gas, so it overestimates the total amount of leakage flow, and considering the effect of the wener contraction, the tip clearance needs to be reduced to 60% of the actual value, without adapting the tip clearance reduction value according to the actual flow situation near the tip clearance, 60% is only an empirical value, which will affect the accuracy of the tip clearance actual flow simulation.
[0005] Another method of tip clearance selection in the prior art is not to compress the blade thickness at the blade tip, but to simply apply periodic conditions (i.e. periodic boundary) between the pressure surface (the pressure surface is the core surface of the rotor blade directly subjected to the pressure of the airflow, pushing the airflow to compress and realizing energy transmission during the rotation and work of the rotor blade, and appearing as a "concave" surface from the blade section, as shown in Figure 1 ) and the suction surface (the suction surface is a specific functional surface in the geometric surface of the rotor blade, which together with the pressure surface constitutes the aerodynamic profile of the blade, and appears as a "convex" surface from the blade section, as shown in Figure 1 , during the work process due to the flow characteristics of the airflow, and plays a key role in regulating the stability of the airflow and the aerodynamic performance of the compressor, as shown in Figure 3 . This method does not allow fluid chordwise transport at the tip clearance, resulting in the mixing properties of the leakage vortex generated by the fluid in the tip clearance not being reflected, and the flow at the zero-thickness sharp edge can be seen, so the degree of compression of the gas is greater, and the gap leakage flow is less than other models.
[0006] Therefore, in order to balance the simulation efficiency, only a small number of grids can be placed in the tip clearance, but this will lead to inaccurate simulation of the gap leakage flow, and the prior art cannot solve this contradiction. SUMMARY
[0007] Therefore, the embodiments of the present application provide a simulation method for the gap leakage flow of a compressor rotor to solve the technical problem of the contradiction between the calculation efficiency and the simulation accuracy of the gap leakage flow in the prior art. The method comprises: In the case of setting a preset number of grids in the tip clearance region, determining the influence relationship of the related speed, the related temperature and the related pressure of the blade at the tip clearance of the compressor under different working conditions with the tip clearance reduction ratio and / or the gap leakage flow; According to the influence relationship, generating a proportional simulation model based on the related speed, the related temperature and the related pressure of the blade at the tip clearance, the proportional simulation model outputs the tip clearance reduction ratio, so that the gap leakage flow calculated based on the preset number of grids after reducing the tip clearance according to the tip clearance reduction ratio meets the preset accuracy; Obtaining the real related speed, the real related temperature and the real related pressure of the blade at the tip clearance of the compressor to be simulated under different working conditions and inputting them into the proportional simulation model, the proportional simulation model outputs the real tip clearance reduction ratio; Multiply the real tip clearance value by the real tip clearance reduction ratio to obtain the reduced tip clearance value; The gap leakage flow of the compressor rotor is simulated according to the reduced tip clearance value, and the preset number of grids are set in the modeled tip clearance region, and the gap leakage flow of the to-be-simulated compressor is calculated based on the gas flow numerical simulation in the preset number of grids.
[0008] The embodiment of the present application also provides a simulation device for the gap leakage flow of a compressor rotor, so as to solve the technical problem that the calculation efficiency and simulation accuracy of the gap leakage flow simulation in the prior art are contradictory. The influence relationship determining module is configured to determine the influence relationship between the relative speed, the relative temperature and the relative pressure of the blade at the tip clearance and the tip clearance reduction ratio and / or the gap leakage flow under different working conditions of the compressor when the preset number of grids are set in the tip clearance region; The model generating module is configured to generate a proportional simulation model based on the relative speed, the relative temperature and the relative pressure of the blade at the tip clearance according to the influence relationship, and the proportional simulation model outputs the tip clearance reduction ratio, so that the gap leakage flow calculated based on the preset number of grids after the tip clearance is reduced according to the tip clearance reduction ratio meets the preset accuracy; The gap reduction ratio calculating module is configured to acquire the real relative speed, the real relative temperature and the real relative pressure of the blade at the tip clearance of the to-be-simulated compressor under different working conditions and input the proportional simulation model, and the proportional simulation model outputs the real tip clearance reduction ratio; The gap reduction module is configured to multiply the real tip clearance value by the real tip clearance reduction ratio to obtain the reduced tip clearance value. The gap leakage flow simulation module is configured to model according to the reduced tip clearance value, and set the preset number of grids in the modeled tip clearance region, and calculate the gap leakage flow of the to-be-simulated compressor based on the gas flow numerical simulation in the preset number of grids.
[0009] The embodiment of the present application also provides a computer device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and the processor implements any simulation method for the gap leakage flow of a compressor rotor described above when the computer program is executed, so as to solve the technical problem that the calculation efficiency and simulation accuracy of the gap leakage flow simulation in the prior art are contradictory.
[0010] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program for executing any simulation method for the gap leakage flow of a compressor rotor described above, so as to solve the technical problem that the calculation efficiency and simulation accuracy of the gap leakage flow simulation in the prior art are contradictory.
[0011] Compared with the prior art, the at least one technical scheme adopted by the embodiment of the present specification can achieve the beneficial effects at least including: firstly, in the case that a preset number of grids are set in the tip clearance region, the influence relationship between the related speed, the related temperature and the related pressure of the blade at the tip clearance under different working conditions of the compressor and the tip clearance reduction ratio and / or the tip clearance leakage flow is determined, then according to the influence relationship, a proportional simulation model is generated based on the related speed, the related temperature and the related pressure of the blade at the tip clearance, so that the tip clearance leakage flow simulated and calculated based on the preset number of grids after the tip clearance is reduced by the tip clearance reduction ratio output by the proportional simulation model can meet the preset accuracy, that is, after the tip clearance is reduced by the tip clearance reduction ratio output by the proportional simulation model, the tip clearance leakage flow simulated and calculated based on the preset number of grids can have a certain accuracy; then the related speed, the related temperature and the related pressure of the blade at the real tip clearance of the compressor to be simulated under different working conditions are input into the proportional simulation model, the real tip clearance value is multiplied by the real tip clearance reduction ratio to obtain a reduced tip clearance value; modeling is performed according to the reduced tip clearance value, and the preset number of grids are set in the modeled tip clearance region, and the tip clearance leakage flow of the compressor to be simulated is simulated and calculated based on the gas flow numerical simulation in the preset number of grids, so as to ensure that the simulated tip clearance leakage flow of the compressor to be simulated has a certain accuracy and meets the accuracy requirement, so that it is realized that the tip clearance can be reduced by simulating and calculating an appropriate tip clearance reduction ratio based on the preset number of grids, so that the tip clearance leakage flow with a certain accuracy is simulated and calculated in the reduced tip clearance region, and the simulation calculation efficiency and accuracy of the tip clearance leakage flow can be taken into account. BRIEF DESCRIPTION OF DRAWINGS
[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0013] Figure 1 is a schematic diagram of the pressure surface, the suction surface, the tip clearance and the tip leakage flow provided by the embodiment of the present application; Figure 2 is a schematic diagram of the tip "shooting" simplified model of the prior art provided by the embodiment of the present application; Figure 3 is a schematic diagram of the tip pressure surface and the suction surface of the prior art provided by the embodiment of the present application adding periodic boundary; Figure 4 This is a schematic flowchart of a simulation method for gap leakage flow of a compressor rotor provided in an embodiment of the present invention; Figure 5 This is a structural block diagram of a computer device provided in an embodiment of the present invention; Figure 6 This is a structural block diagram of a simulation device for gap leakage flow of a compressor rotor provided in an embodiment of the present invention. Detailed Implementation
[0014] The embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0015] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0016] In this embodiment of the invention, a method for simulating gap leakage flow for a compressor rotor is provided, such as... Figure 4 As shown, the method includes: Step S401: With a preset number of grids set in the blade tip clearance region, determine the influence relationship between the relevant velocity, relevant temperature and relevant pressure of the blade at the blade tip clearance under different operating conditions and the blade tip clearance reduction ratio and / or clearance leakage flow rate. Step S402: Based on the influence relationship, a proportional simulation model is generated based on the relevant velocity, relevant temperature and relevant pressure of the blade at the blade tip gap. The proportional simulation model outputs the blade tip gap reduction ratio, so that after the blade tip gap is reduced according to the blade tip gap reduction ratio, the gap leakage flow calculated based on the preset number of grids meets the preset accuracy. Step S403: Obtain the relevant velocity, temperature and pressure of the blades at the actual blade tip clearance of the compressor to be simulated under different operating conditions and input them into the proportional simulation model. The proportional simulation model outputs the actual blade tip clearance reduction ratio. Step S404: Multiply the actual tip gap value by the actual tip gap reduction ratio to obtain the reduced tip gap value; Step S405: Model the compressor according to the reduced blade tip clearance value, and set the preset number of grids in the modeled blade tip clearance area. Calculate the clearance leakage flow rate of the compressor to be simulated based on the gas flow values within the preset number of grids.
[0017] In practical implementation, before generating the scaled simulation model, to ensure that the tip clearance reduction ratio output by the scaled simulation model can resolve the contradiction between the efficiency and accuracy of the tip leakage flow simulation calculation, it is proposed that it is necessary to first determine which parameters have a direct or indirect impact on the tip leakage flow and / or the tip clearance reduction ratio, and then generate the scaled simulation model based on the relevant parameters and their impact relationships. The process of determining which parameters have a direct or indirect impact on the tip leakage flow and / or the tip clearance reduction ratio can be based on existing experimental data. If experimental data is unavailable, relevant data can be collected by setting up a small number of grids with different sparsity in the tip clearance region, setting different tip clearance reduction ratios, and quickly simulating the tip leakage flow. The process of analyzing and determining the impact relationships can then be based on the collected relevant data, the different tip clearance reduction ratios, and the quickly simulated tip leakage flow.
[0018] In practice, determining which parameters have a direct or indirect impact on the gap leakage flow rate and / or the reduction ratio of the blade tip clearance can be achieved through trained neural network models or large language models, or through manual or expert analysis.
[0019] In practical implementation, to effectively balance the efficiency and accuracy of simulation calculations for gap leakage flow, this embodiment proposes determining the influence relationship between specific blade parameters at the blade tip clearance under different compressor operating conditions and the blade tip clearance reduction ratio and / or gap leakage flow. For example... The relevant velocities of the blade at the tip gap include: the blade tip linear velocity. Gas velocity near the blade tip on the pressure side of the blade ; If the tip linear velocity of the blade An increase in the velocity leads to a larger deviation between the numerical simulation and the accurate value of the gap leakage flow; that is, the tip linear velocity of the blade. This has a direct impact on the reduction ratio of the blade tip gap. When the blade tip clearance is increased, if too few grids are used, the simulated value of the clearance leakage flow rate will deviate more from the accurate value (e.g., the true value of the clearance leakage flow rate), thus requiring a larger blade tip clearance reduction ratio. The gas velocity near the tip of the blade on the pressure surface side The gap leakage flow rate is positively correlated with the reduction ratio of the blade tip clearance; that is, the gas velocity near the blade tip on the pressure side of the blade. This parameter does not directly affect the reduction ratio of the blade tip clearance, but it does affect the velocity coefficient. speed coefficient As a function for simulating gap leakage flow rate The input parameters directly affect the gap leakage flow rate and are positively correlated with the gap leakage flow rate. In turn, the gap leakage flow rate is positively correlated with the reduction ratio of the blade tip clearance.
[0020] For example, the relevant temperature of the blade at the tip clearance includes: the total temperature of the blade's pressure side near the casing. The total temperature of the pressure surface side of the blade near the casing The gap leakage flow rate is negatively correlated with the tip clearance reduction ratio, and this parameter does not directly affect the tip clearance reduction ratio. However, the gap leakage flow rate is positively correlated with the tip clearance reduction ratio.
[0021] For example, the relevant pressure of the blade at the blade tip gap includes: the pressure difference between the suction surface and the pressure surface of the blade. The total pressure on the pressure side of the blades near the casing ; The pressure difference between the suction surface and the pressure surface of the blade It is negatively correlated with the reduction in the tip gap; that is... It has a direct impact on the reduction ratio of the blade tip clearance. When the blade tip clearance is increased, if the number of grids in the blade tip clearance region is small, the sensitivity to the simulation results of clearance leakage flow will decrease. Therefore, it is necessary to reduce the value of the blade tip clearance reduction ratio. The total pressure on the pressure side of the blade near the casing It is positively correlated with the clearance leakage flow rate, meaning that this parameter does not directly affect the tip clearance reduction ratio, but it directly affects the clearance leakage flow rate and is positively correlated with the clearance leakage flow rate. In turn, the clearance leakage flow rate is positively correlated with the tip clearance reduction ratio.
[0022] In practical implementation, once the above-mentioned influencing relationships are determined, the above-mentioned proportional simulation model can be generated. This proportional simulation model can be in the form of a trained network model (i.e., a network model trained and learning the above-mentioned influencing relationships) or in the form of a formula. For example, the proportional simulation model is as follows:
[0023] Where r is the reduction ratio of the tip clearance. Let be the linear velocity at the tip of the blade. This represents the pressure difference between the suction and pressure surfaces of the blade. This refers to the total temperature on the pressure side of the blade near the casing. This refers to the total pressure on the pressure side of the blade near the casing. This is the function for calculating the gap leakage flow rate. , It is a constant. 1.4 can be taken. For speed coefficient, , R is the gas velocity near the blade tip on the pressure side of the blade. R is a constant, which can be 287. K is the aerodynamic constant. The fluid flow inside the compressor is generally air. K can be 0.0404, which is the aerodynamic constant specified in fluid mechanics.
[0024] In specific implementation, to further improve the accuracy of the blade tip clearance reduction ratio, this embodiment proposes to further increase the Reynolds number to generate the proportional simulation model. For example, the proportional simulation model is generated based on the relevant velocity, relevant temperature, and relevant pressure of the blade at the blade tip clearance, including: The scaled simulation model is generated based on the relevant velocity, relevant temperature, relevant pressure, and Reynolds number of the blade at the tip gap. The Reynolds number is related to the density of the pressure surface of the blade near the casing at the tip gap, the static temperature of the pressure surface of the blade near the casing at the tip gap, and the area of the tip gap.
[0025] Specifically, the formula for the proportional simulation model can also be in the following form:
[0026] Where r is the reduction ratio of the tip clearance. Let be the linear velocity at the tip of the blade. This represents the pressure difference between the suction and pressure surfaces of the blade. This refers to the total temperature on the pressure side of the blade near the casing. This refers to the total pressure on the pressure side of the blade near the casing. This is the function for calculating the gap leakage flow rate. , It is a constant. For speed coefficient, , Let R be the gas velocity near the blade tip on the pressure side of the blade, K be the aerodynamic constant, and Re be the Reynolds number. , The density is located on the pressure side of the blade near the casing. The dynamic viscosity is determined based on the static temperature T near the casing on the pressure side of the blade, using air data. This represents the area of the leaf tip gap.
[0027] Specifically, the density on the pressure side of the blade near the casing This parameter does not directly affect the tip clearance reduction ratio; it serves as an input parameter for calculating the Reynolds number. Specifically, the static temperature T near the casing on the pressure side of the blade does not directly affect the tip clearance reduction ratio; it serves as the data basis for determining the dynamic viscosity. Air data can be obtained based on the static temperature T near the casing on the pressure side of the blade to determine the corresponding dynamic viscosity. This parameter does not directly affect the tip clearance reduction ratio; it serves as an input parameter for calculating the Reynolds number. Specifically, calculate the area of the blade tip gap. , The tip clearance value is multiplied by the blade chord length. This parameter does not directly affect the reduction ratio of the tip clearance; it serves as an input parameter for calculating the Reynolds number.
[0028] Specifically, the relationship between Reynolds number and tip clearance reduction ratio is as follows: when the Reynolds number Re decreases, if too few grids are used in the tip clearance region, the simulated value of the clearance leakage flow will deviate more from the accurate value. Therefore, a larger tip clearance reduction ratio is required, that is, the Reynolds number and the tip clearance reduction ratio are negatively correlated.
[0029] In practical implementation, verification showed that both formula forms of the proportional simulation model (including the formula with Reynolds number and the formula without Reynolds number) can meet the requirements of balancing the simulation calculation efficiency and accuracy of gap leakage flow. Either formula can be selected for application. The linear fit correlation coefficient of the formula without Reynolds number is 0.78, while the linear fit correlation coefficient of the formula with Reynolds number is 0.924. The formula can reduce the gap based on the specific parameters at the blade tip clearance under different compressor operating conditions, further improving the accuracy of the blade tip clearance reduction ratio and ensuring more accurate simulation of gap leakage flow.
[0030] In practice, the total temperature on the pressure side of the blade near the casing The total pressure on the pressure side of the blades near the casing Density of the pressure side of the blade near the casing The average values of the corresponding data at the blade tip gap on the pressure side can be selected separately (such as the average total temperature, the average total pressure, and the average density).
[0031] In practical implementation, after obtaining the above-mentioned proportional simulation model, the proportional simulation model can be applied to the simulation of the gap leakage flow of different compressor rotors to be simulated. The relevant velocity, relevant temperature and relevant pressure of the blades at the actual blade tip clearance of different compressor rotors to be simulated are input into the proportional simulation model. The proportional simulation model outputs the actual blade tip clearance reduction ratio. Then, based on the actual blade tip clearance reduction ratio, the blade tip clearance value of the compressor to be simulated is reduced and the blade tip clearance is modeled. Then, a small number of preset grids are set in the blade tip clearance area to simulate and calculate the gap leakage flow.
[0032] In practice, the aforementioned preset number of grids can be a smaller number of grids that meets the requirements for simulation computing efficiency, and the specific value of the preset number can be determined according to specific needs.
[0033] In practice, the aforementioned preset accuracy can be the accuracy that meets the relevant requirements for gap leakage flow simulation. For example, its specific form can be the range of difference between the simulated value and the true value of gap leakage flow when the accuracy meets the relevant requirements for gap leakage flow simulation.
[0034] In this embodiment, a computer device is provided, such as... Figure 5 As shown, it includes a memory 501, a processor 502, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described simulation method for any of the gap leakage flows oriented towards the compressor rotor.
[0035] Specifically, the computer device can be a computer terminal, a server, or a similar computing device.
[0036] In this embodiment, a computer-readable storage medium is provided, which stores a computer program that performs any of the above-described simulation methods for gap leakage flow oriented towards a compressor rotor.
[0037] Specifically, computer-readable storage media, including both permanent and non-permanent, removable and non-removable media, can store information using any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer-readable storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable storage media does not include transient media, such as modulated data signals and carrier waves.
[0038] Based on the same inventive concept, this invention also provides a simulation device for gap leakage flow of a compressor rotor, as described in the following embodiments. Since the principle of the simulation device for gap leakage flow of a compressor rotor is similar to that of the simulation method for gap leakage flow of a compressor rotor, the implementation of the simulation device for gap leakage flow of a compressor rotor can refer to the implementation of the simulation method for gap leakage flow of a compressor rotor, and will not be repeated. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.
[0039] Figure 6 This is a structural block diagram of a simulation device for gap leakage flow of a compressor rotor according to an embodiment of the present invention, such as... Figure 6 As shown, it includes: The influence relationship determination module 601 is used to determine the influence relationship between the relevant speed, relevant temperature and relevant pressure of the blade at the blade tip clearance and the blade tip clearance reduction ratio and / or clearance leakage flow rate of the compressor under different operating conditions, when a preset number of grids are set in the blade tip clearance region. The model generation module 602 is used to generate a proportional simulation model based on the relevant velocity, temperature and pressure of the blade at the blade tip gap according to the influence relationship. The proportional simulation model outputs the blade tip gap reduction ratio so that the gap leakage flow rate obtained by simulation calculation based on the preset number of grids after reducing the blade tip gap according to the blade tip gap reduction ratio meets the preset accuracy. The clearance reduction ratio calculation module 603 is used to obtain the relevant speed, relevant temperature and relevant pressure of the blade at the actual blade tip clearance of the compressor under different operating conditions and input them into the proportional simulation model. The proportional simulation model outputs the actual blade tip clearance reduction ratio. The gap reduction module 604 is used to multiply the actual blade tip gap value by the actual blade tip gap reduction ratio to obtain the reduced blade tip gap value. The gap leakage flow simulation module 605 is used to model the compressor to be simulated based on the reduced blade tip gap value, and to set the preset number of grids in the modeled blade tip gap area, and to calculate the gap leakage flow rate of the compressor to be simulated based on the gas flow numerical simulation within the preset number of grids.
[0040] In one embodiment, the model generation module is further configured to generate the scaled simulation model based on the relevant velocity, relevant temperature, relevant pressure, and Reynolds number of the blade at the tip gap, wherein the Reynolds number is related to the density of the pressure surface side of the blade near the casing at the tip gap, the static temperature of the pressure surface side of the blade near the casing at the tip gap, and the area of the tip gap.
[0041] The embodiments of this invention achieve the following technical effects: First, assuming a preset number of grids are set in the blade tip clearance region, the influence relationships between the relevant velocity, temperature, and pressure of the blades at the blade tip clearance and the blade tip clearance reduction ratio and / or clearance leakage flow rate under different operating conditions of the compressor are determined. Then, based on these influence relationships, a proportional simulation model is generated based on the relevant velocity, temperature, and pressure of the blades at the blade tip clearance. This allows the blade tip clearance to be reduced according to the reduction ratio output by the proportional simulation model, and the clearance leakage flow rate calculated based on the preset number of grids can meet a preset accuracy. In other words, by using the reduction ratio output by the proportional simulation model to reduce the blade tip clearance, a clearance leakage flow rate with a certain accuracy can be simulated and calculated with a smaller preset number of grids. Furthermore, the compressor under different operating conditions can be simulated... The relevant velocity, temperature, and pressure of the blade at the actual blade tip clearance are input into the proportional simulation model. The actual blade tip clearance value is multiplied by the actual blade tip clearance reduction ratio to obtain the reduced blade tip clearance value. The model is then built according to the reduced blade tip clearance value, and a preset number of grids are set within the modeled blade tip clearance region. Based on the gas flow values within the preset number of grids, the clearance leakage flow of the compressor to be simulated is calculated. This ensures that the simulated clearance leakage flow of the compressor to be simulated has a certain degree of accuracy and meets the accuracy requirements. This allows for the reduction of the blade tip clearance by setting a relatively small number of grids and calculating an appropriate blade tip clearance reduction ratio. This results in a clearance leakage flow with a certain degree of accuracy being calculated within the reduced blade tip clearance region, achieving a balance between simulation calculation efficiency and accuracy for clearance leakage flow.
[0042] Obviously, those skilled in the art should understand that the modules or steps of the above-described embodiments of the present invention can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented here, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the embodiments of the present invention are not limited to any particular hardware and software combination.
[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A simulation method for gap leakage flow of a compressor rotor, characterized in that, include: With a preset number of grids set in the blade tip clearance region, the influence of the blade velocity, temperature and pressure at the blade tip clearance under different operating conditions on the blade tip clearance reduction ratio and / or clearance leakage flow rate is determined. Based on the aforementioned influence relationship, a proportional simulation model is generated based on the relevant velocity, temperature, and pressure of the blade at the blade tip gap. The proportional simulation model outputs the blade tip gap reduction ratio, so that after the blade tip gap is reduced according to the blade tip gap reduction ratio, the gap leakage flow rate calculated based on the preset number of grids meets the preset accuracy. The relevant speeds, temperatures, and pressures of the blades at the actual blade tip clearance of the compressor to be simulated under different operating conditions are obtained and input into the proportional simulation model. The proportional simulation model outputs the actual blade tip clearance reduction ratio. Multiply the actual tip gap value by the actual tip gap reduction ratio to obtain the reduced tip gap value; Modeling is performed based on the reduced blade tip clearance value, and a preset number of grids are set in the modeled blade tip clearance region. The clearance leakage flow rate of the compressor to be simulated is calculated based on the gas flow numerical simulation within the preset number of grids.
2. The method as described in claim 1, characterized in that, The relevant velocities of the blade at the blade tip gap include: the blade tip linear velocity and the gas velocity near the blade tip on the pressure side of the blade; if the blade tip linear velocity increases, the numerical simulation of the gap leakage flow rate will deviate more from the accurate value; the gas velocity near the blade tip on the pressure side of the blade is positively correlated with the gap leakage flow rate, and the gap leakage flow rate is positively correlated with the reduction ratio of the blade tip gap.
3. The method as described in claim 1, characterized in that, The relevant temperature of the blade at the blade tip gap includes: the total temperature of the pressure side of the blade near the casing, and the total temperature of the pressure side of the blade near the casing is negatively correlated with the gap leakage flow rate.
4. The method as described in claim 1, characterized in that, The relevant pressures of the blade at the blade tip gap include: the pressure difference between the suction surface and the pressure surface of the blade, and the total pressure on the pressure surface side of the blade near the casing; the pressure difference between the suction surface and the pressure surface of the blade is negatively correlated with the reduction ratio of the blade tip gap; and the total pressure on the pressure surface side of the blade near the casing is positively correlated with the gap leakage flow rate.
5. The method according to any one of claims 1 to 4, characterized in that, The proportional simulation model is as follows: Where r is the reduction ratio of the tip clearance. Let be the linear velocity at the tip of the blade. This represents the pressure difference between the suction and pressure surfaces of the blade. This refers to the total temperature on the pressure side of the blade near the casing. This refers to the total pressure on the pressure side of the blade near the casing. This is the function for calculating the gap leakage flow rate. , It is a constant. For speed coefficient, , Let R be the gas velocity near the blade tip on the pressure side of the blade, and K be the aerodynamic constant.
6. The method according to any one of claims 1 to 4, characterized in that, The method further includes: generating a proportional simulation model based on the relevant velocity, relevant temperature, and relevant pressure of the blade at the blade tip gap, including: The scaled simulation model is generated based on the relevant velocity, relevant temperature, relevant pressure, and Reynolds number of the blade at the tip gap. The Reynolds number is related to the density of the pressure surface of the blade near the casing at the tip gap, the static temperature of the pressure surface of the blade near the casing at the tip gap, and the area of the tip gap.
7. The method as described in claim 6, characterized in that, The proportional simulation model is as follows: Where r is the reduction ratio of the tip clearance. Let be the linear velocity at the tip of the blade. This represents the pressure difference between the suction and pressure surfaces of the blade. This refers to the total temperature on the pressure side of the blade near the casing. This refers to the total pressure on the pressure side of the blade near the casing. This is the function for calculating the gap leakage flow rate. , It is a constant. For speed coefficient, , Let R be the gas velocity near the blade tip on the pressure side of the blade, K be the aerodynamic constant, and Re be the Reynolds number. , The density is located on the pressure side of the blade near the casing. The dynamic viscosity is determined based on the static temperature T near the casing on the pressure side of the blade, using air data. This represents the area of the leaf tip gap.
8. A device for simulating gap leakage flow of a compressor rotor, characterized in that, include: The influence relationship determination module is used to determine the influence relationship between the relevant speed, relevant temperature and relevant pressure of the blade at the blade tip clearance and the blade tip clearance reduction ratio and / or clearance leakage flow rate of the compressor under different operating conditions, when a preset number of grids are set in the blade tip clearance region. The model generation module is used to generate a proportional simulation model based on the relevant velocity, temperature and pressure of the blade at the blade tip gap according to the influence relationship. The proportional simulation model outputs the blade tip gap reduction ratio, so that the gap leakage flow rate calculated based on the preset number of grids after reducing the blade tip gap according to the blade tip gap reduction ratio meets the preset accuracy. The clearance reduction ratio calculation module is used to obtain the relevant velocity, relevant temperature and relevant pressure of the blade at the actual blade tip clearance of the compressor under different operating conditions and input them into the proportional simulation model. The proportional simulation model outputs the actual blade tip clearance reduction ratio. The gap reduction module is used to multiply the actual blade tip gap value by the actual blade tip gap reduction ratio to obtain the reduced blade tip gap value. The gap leakage flow simulation module is used to model the compressor to be simulated based on the reduced blade tip gap value, and to set the preset number of grids in the modeled blade tip gap region. The gap leakage flow rate of the compressor to be simulated is calculated based on the gas flow numerical simulation within the preset number of grids.
9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the simulation method for gap leakage flow oriented towards the compressor rotor as described in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that performs a simulation method for gap leakage flow oriented towards a compressor rotor according to any one of claims 1 to 7.