One-dimensional design method and system, device, and storage medium for variable speed power turbine

Abstract

This invention discloses a one-dimensional design method, system, device, and storage medium for a variable-speed power turbine. The one-dimensional design method for the variable-speed power turbine iteratively optimizes the design speed point by calculating the comprehensive performance of the variable-speed power turbine under all operating conditions. It takes into account the characteristics of the wide operating range of the variable-speed power turbine and establishes a comprehensive performance evaluation index and system applicable to the operating characteristics of the variable-speed power turbine. It accurately reflects the comprehensive performance of the variable-speed power turbine throughout the entire mission cycle and accurately evaluates and predicts the full-mission performance of the variable-speed power turbine. It can achieve the goal of efficient aerodynamic design of the variable-speed power turbine under a wide range of operating conditions and meet the design requirements of stable and efficient operation of the variable-speed power turbine within a wide range of operating conditions.

Description

Technical Field

[0001] This invention relates to the field of power turbine design technology, and in particular to a one-dimensional design method and system for variable speed power turbines, electronic devices, and computer-readable storage media. Background Technology

[0002] With the development of high-speed rotorcraft, there is a growing demand for power systems that can reduce output speed while maintaining relatively constant output power under high-speed cruise conditions. Currently, conventional turboshaft engine turbines operate at a relatively constant speed near their design point, ensuring aerodynamic efficiency only within a narrow range of operating conditions. However, the mission characteristics of high-speed rotorcraft place higher demands on the performance and operating range of turboshaft engine turbines, requiring them to operate for extended periods at multiple significantly different speeds. Therefore, conventional turbines cannot meet the requirements of high-speed rotorcraft. Variable-speed turbines, on the other hand, offer multi-state, wide-range adaptability, avoiding the structural complexity and added weight of variable-speed transmission systems and their shifting mechanisms, making them highly competitive in the high-speed rotorcraft market.

[0003] Currently, for conventional power turbines, the location of the design point is determined in the one-dimensional design process, and the design objective is usually to ensure high efficiency at the design point, thereby determining the velocity triangle of the blade midsection. However, for variable-speed power turbines, the design objective is to optimize the overall performance of the turbine, and the location of the design point is unknown. Furthermore, due to the wide operating range requirements of variable-speed power turbines, they face new challenges compared to conventional power turbines in performance evaluation, design point selection, and design parameter selection. The one-dimensional design method for conventional power turbines is not applicable to variable-speed power turbines. Therefore, a one-dimensional design method specifically for variable-speed power turbines is needed, but there is currently no relevant solution in the existing technology. Summary of the Invention

[0004] This invention provides a one-dimensional design method and system for variable speed power turbines, electronic devices, and computer-readable storage media to solve the technical problem that there is currently no one-dimensional design method applicable to variable speed power turbines in the prior art.

[0005] According to one aspect of the present invention, a one-dimensional design method for a variable speed power turbine is provided, comprising the following:

[0006] Enter the target speed range;

[0007] Based on the inverse problem design of each speed state within the target speed range, one-dimensional geometric parameters of the variable speed power turbine under different speed states are obtained;

[0008] Based on one-dimensional geometric parameters under different speed conditions, forward problem calculation and analysis are performed to obtain the turbine characteristics of the variable speed power turbine under different speed conditions;

[0009] The comprehensive performance of the variable speed power turbine under different operating conditions is calculated based on the turbine characteristics under different speed conditions, and the speed condition with the highest comprehensive performance under different operating conditions is selected as the design speed point.

[0010] Furthermore, the overall performance of the variable speed power turbine under all operating conditions is calculated based on the following formula:

[0011]

[0012] Where ξ represents the comprehensive performance evaluation index of the variable speed power turbine, and η i t represents the efficiency of a variable-speed power turbine at speed i. i This represents the operating time of the variable speed power turbine at speed i, where T is the total operating time of the variable speed power turbine, and w i W represents the fuel consumption flow rate of a variable-speed power turbine at speed i. design This indicates the design fuel flow rate at different engine speeds.

[0013] Furthermore, the efficiency of the variable speed power turbine is calculated based on the following formula:

[0014]

[0015] Where u represents the load factor, D 2m Indicates the ratio of the inlet and outlet diameters. Ka represents the velocity loss coefficient of the stator blades, and Ka represents the axial speed ratio coefficient. C represents the flow coefficient. 1u U2 represents the circumferential component of the absolute velocity at the inlet, U2 represents the circumferential velocity at the outlet, ψ represents the velocity loss coefficient of the moving blade, and W represents the velocity component of the moving blade. 2u The circumferential component of the relative velocity at the exit.

[0016] Furthermore, when performing inverse problem design, the number of turbine stages is initially selected, and then inverse problem design, forward problem calculation and analysis, and comprehensive performance calculation under all operating conditions are performed in sequence. The goal is to achieve the best comprehensive performance under all operating conditions for the entire engine mission, and the selection of other design parameters is used as a constraint to perform iterative optimization and select the number of turbine stages corresponding to the highest comprehensive performance under all operating conditions.

[0017] Furthermore, when the power level is 5000kW to 6000kW, a 4-stage turbine is used.

[0018] Furthermore, when designing the inverse problem, if the variable speed power turbine has three or more stages, the power distribution ratio is set as follows: intermediate stage > first stage > last stage.

[0019] Furthermore, when designing the inverse problem, the outlet Mach number of the variable speed power turbine is set to 0.4–0.75.

[0020] In addition, the present invention also provides a one-dimensional design system for a variable speed power turbine, comprising:

[0021] The target speed input module is used to input the target speed range;

[0022] The inverse problem design module is used to perform inverse problem design based on the various speed states within the target speed range, and obtain the one-dimensional geometric parameters of the variable speed power turbine under different speed states;

[0023] The forward problem calculation module is used to perform forward problem calculation and analysis based on one-dimensional geometric parameters under different speed conditions, so as to obtain the turbine characteristics of the variable speed power turbine under different speed conditions;

[0024] The design point selection module is used to calculate the overall performance of the variable speed power turbine under different operating conditions based on the turbine characteristics under different speed conditions, and select the speed condition with the highest overall performance under different operating conditions as the design speed point.

[0025] In addition, the present invention also provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the method described above by calling the computer program stored in the memory.

[0026] In addition, the present invention provides a computer-readable storage medium for storing a computer program for one-dimensional design of a variable speed power turbine, wherein the computer program executes the steps of the method described above when run on a computer.

[0027] The present invention has the following effects:

[0028] The one-dimensional design method for variable-speed turbines of this invention allows for inputting a target speed range based on the mission requirements of a high-speed rotorcraft. Then, inverse problem calculations are performed for each speed state within the target range to obtain the one-dimensional geometric parameters of the variable-speed turbine at different speed states. Next, forward problem calculations are performed based on these one-dimensional geometric parameters at the same speed state to obtain the turbine characteristics of the variable-speed turbine at different speed states. Finally, the comprehensive performance of the variable-speed turbine under different operating conditions is calculated based on the turbine characteristics at different speed states, and the speed state with the highest comprehensive performance under all operating conditions is selected as the design speed point. This one-dimensional design method for variable-speed turbines of this invention iteratively optimizes the design speed point by calculating the comprehensive performance of the variable-speed turbine under all operating conditions. It considers the characteristics of a wide operating range of variable-speed turbines and establishes a comprehensive performance evaluation index and system applicable to the operating characteristics of variable-speed turbines. This accurately reflects the comprehensive performance of the variable-speed turbine throughout the entire mission cycle, accurately assesses and predicts the full-mission performance of the variable-speed turbine, and can achieve the goal of efficient aerodynamic design of variable-speed turbines over a wide operating range, meeting the design requirements for stable and efficient operation of variable-speed turbines over a wide operating range.

[0029] In addition, the one-dimensional design system for the variable speed power turbine of the present invention also has the above-mentioned advantages.

[0030] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a flowchart illustrating a preferred embodiment of the one-dimensional design method for a variable-speed power turbine of the present invention.

[0033] Figure 2 This is a schematic diagram comparing the efficiency curves of variable speed power turbines designed using the design method of this invention and conventional design methods in a preferred embodiment of the present invention.

[0034] Figure 3 This is a schematic diagram of the module structure of a one-dimensional design system for a variable speed power turbine according to another embodiment of the present invention. Detailed Implementation

[0035] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0036] like Figure 1 As shown, a preferred embodiment of the present invention provides a one-dimensional design method for a variable speed power turbine, including the following:

[0037] Step S1: Input the target speed range;

[0038] Step S2: Based on the speed states within the target speed range, perform inverse problem design to obtain the one-dimensional geometric parameters of the variable speed power turbine under different speed states;

[0039] Step S3: Perform forward problem calculation and analysis based on one-dimensional geometric parameters under different speed conditions to obtain the turbine characteristics of the variable speed power turbine under different speed conditions;

[0040] Step S4: Calculate the overall performance of the variable speed power turbine under different operating conditions based on the turbine characteristics under different speed conditions, and select the speed condition with the highest overall performance under different operating conditions as the design speed point.

[0041] It is understood that the one-dimensional design method for the variable-speed power turbine in this embodiment can be implemented by inputting a target speed range based on the mission requirements of the high-speed rotorcraft. Then, inverse problem calculations are performed for each speed state within the target speed range to obtain the one-dimensional geometric parameters of the variable-speed power turbine under different speed states. Next, forward problem calculations are performed based on the one-dimensional geometric parameters under the same speed state to obtain the turbine characteristics of the variable-speed power turbine under different speed states. Finally, the comprehensive performance of the variable-speed power turbine under different speed states is calculated based on the turbine characteristics under different speed states, and the speed state with the highest comprehensive performance under all operating conditions is selected as the design speed point. This one-dimensional design method for the variable-speed power turbine of the present invention iteratively optimizes the design speed point by calculating the comprehensive performance of the variable-speed power turbine under all operating conditions. It considers the characteristics of the wide operating range of the variable-speed power turbine, establishes a comprehensive performance evaluation index and system suitable for the operating characteristics of the variable-speed power turbine, accurately reflects the comprehensive performance of the variable-speed power turbine throughout the entire mission cycle, and accurately evaluates and predicts the full-mission performance of the variable-speed power turbine. This can achieve the goal of efficient aerodynamic design of the variable-speed power turbine over a wide operating range and meet the design requirements for stable and efficient operation of the variable-speed power turbine over a wide operating range.

[0042] It is understood that in step S1, the target speed range can be determined according to the mission requirements of the high-speed rotorcraft. High-speed rotorcraft generally require the power turbine to maintain constant power and basically equal expansion ratio at 50% to 100% cruise speed. Therefore, the target speed range is set to 50% to 100% speed.

[0043] It is understood that in step S2, inverse problem design is performed for each speed state within the target speed range to obtain the one-dimensional geometric parameters of the variable-speed turbine under different speed states. For example, inverse problem design is performed for the 50%, 60%, 70%, 80%, 90%, and 100% speed states within the 50%–100% speed range, thereby obtaining the one-dimensional geometric parameters of the variable-speed turbine under these states. These one-dimensional geometric parameters include the inlet and outlet configuration angles and geometric flow channel dimensions of each blade row of the turbine. Furthermore, the specific inverse problem design process is well-known in the art and will not be elaborated upon here.

[0044] It is understood that in step S3, forward problem calculations are performed based on the one-dimensional geometric parameters at different speeds to obtain the turbine characteristics of the variable-speed power turbine at different speeds, thereby obtaining the turbine characteristic curves of the variable-speed power turbine at different speeds. For example, forward problem calculations are performed based on the one-dimensional geometric parameters of the variable-speed power turbine at 50% speed to obtain the turbine efficiency characteristic curve of the variable-speed power turbine at 50% speed. The turbine efficiency characteristic curve includes the efficiency at each speed throughout the entire mission cycle. For example, when performing forward problem calculations on the one-dimensional geometric parameters at 50% speed, it is necessary to calculate the efficiency values ​​of the variable-speed power turbine at each speed throughout the entire mission cycle. Furthermore, the specific forward problem calculation process is well-known in the art, and the specific process will not be elaborated here.

[0045] Currently, conventional one-dimensional design methods for power turbines calculate turbine efficiency by assuming U1 = U2, C 1a =C 2a The corresponding dimensionless parameters are obtained, and the turbine efficiency is calculated according to a certain loss model combined with equation (1). Where U1 represents the inlet circumferential velocity, U2 represents the outlet circumferential velocity, and C... 1a C represents the inlet axial velocity. 2a This indicates the axial velocity at the outlet.

[0046]

[0047] Where η represents the turbine efficiency and u represents the load factor. ψ represents the flow coefficient, ψ represents the velocity loss coefficient of the moving blade, and Ka represents the axial speed ratio coefficient. Ω represents the velocity loss coefficient of the stator blade, and D represents the reaction force. 2m Indicates the inlet / outlet diameter ratio. The velocity loss coefficient ψ of the moving blade and the velocity loss coefficient of the stationary blade. The five dimensionless parameters Ka, u, and D are calculated from the selected loss model. 2m Ω and The expression for is shown in equation (2).

[0048]

[0049] Among them, C 1U C represents the circumferential velocity component of the absolute velocity of the inlet. 2U The circumferential velocity component representing the absolute velocity at the exit.

[0050] The conventional one-dimensional design method for power turbines obtains the optimal efficiency value by combining the five dimensionless parameters in equation (1), and then calculates the corresponding velocity triangle by combining it with the rotational speed, thereby calculating the corresponding turbine meridional flow channel. Therefore, the accuracy of the calculation in equation (1) determines the quality of the one-dimensional design of the power turbine. It can be understood that in equation (1), the velocity loss coefficient ψ of the moving blade and the velocity loss coefficient of the stationary blade are... The accuracy of the calculation is determined by the prediction accuracy of the selected loss model. Therefore, under the premise of selecting the loss model, the selection of the five dimensionless parameters fundamentally determines the quality of the power turbine design. However, the conventional one-dimensional design method of power turbines, based on equation (2), assumes that the mean diameter and axial velocity of the inlet and outlet of the moving blade are the same when calculating the load coefficient u and the reaction force Ω. For variable speed power turbines, it is difficult to meet these two conditions. Therefore, the efficiency value of the variable speed power turbine calculated based on the conventional one-dimensional design method of power turbines and the designed flow channel will have a large deviation from the actual situation, resulting in the one-dimensional design result of the variable speed power turbine not meeting the requirements.

[0051] This invention redefines the load factor u and reaction force Ω using a variable specific heat calculation method, improving calculation accuracy and further increasing the one-dimensional design accuracy of power turbines by more than 1%. The specific process is as follows:

[0052] In the absence of heat exchange with the external environment, the energy equation in the form of enthalpy in a relative coordinate system is:

[0053]

[0054] Where h2 represents the relative total enthalpy of exports, h1 represents the relative total enthalpy of imports, W2 represents the relative velocity of exports, and W1 represents the relative velocity of imports.

[0055] Then, based on the definition of counterforce, we know that:

[0056]

[0057] in, This represents the total enthalpy of imports. L represents the total enthalpy of exports. u It represents the power of the wheel's edge.

[0058] And Wheel Edge Power L u The expression is:

[0059]

[0060] Among them, C 1u C represents the circumferential velocity component of the absolute velocity of the inlet. 2u W represents the circumferential velocity component of the absolute velocity at the exit. 2u The circumferential component of the relative velocity at the exit.

[0061] Then the counterforce Ω can be reconstructed into a new expression:

[0062]

[0063] The load factor u and the flange work L u The relationship is as follows:

[0064]

[0065] Where U represents the circumferential velocity.

[0066] If the circumferential velocity is taken as the average of the inlet and outlet velocities, then the new load factor formula is as follows:

[0067]

[0068] Equations (6) and (8) are processed by dividing both the numerator and denominator by . The results were:

[0069]

[0070] make Then we can obtain a system of two quadratic equations in two variables:

[0071]

[0072] make:

[0073]

[0074] Then the solution for m and n is:

[0075]

[0076] Therefore, the formula for calculating turbine efficiency can be reformulated as:

[0077]

[0078] Among them, D2m L represents the ratio of the inlet and outlet diameters. * L represents isentropic work. CL It indicates a loss of work.

[0079] It can be understood that in step S4, after obtaining the turbine efficiency characteristic curves at different speeds, the overall performance of the variable-speed power turbine under different operating conditions is calculated, and then the speed at which the overall performance is highest is selected as the design speed point. Specifically, the overall performance of the variable-speed power turbine under different operating conditions is calculated based on the following formula:

[0080]

[0081] Where ξ represents the comprehensive performance evaluation index of the variable speed power turbine, and η i The efficiency of the variable speed power turbine at speed i during the mission cycle is represented by formula (13), t. i The variable-speed power turbine operates at speed i for the duration of its rotational speed within the mission cycle, where T is the total operating time of the variable-speed power turbine within the mission cycle, and w is the total operating time of the variable-speed power turbine within the mission cycle. i W represents the fuel consumption flow rate of the variable speed power turbine at speed i during the task cycle. design This indicates the design fuel flow rate at different engine speeds. Specifically, by employing... Using this as a weighting coefficient can increase the proportion of the turbine state under high fuel consumption and decrease the proportion of the turbine state under low fuel consumption. Furthermore, it takes into account the operating time and fuel consumption flow at different speeds, which greatly improves the accuracy of the comprehensive performance evaluation under all operating conditions.

[0082] It is understandable that after selecting the speed state with the highest comprehensive performance under all working conditions as the design speed point, the flow channel design of the variable speed power turbine is carried out based on the one-dimensional geometric parameters obtained by inverse problem design at the design speed point.

[0083] Optionally, during the inverse problem design, the number of turbine stages is initially selected. Then, inverse problem design, forward problem calculation and analysis, and comprehensive performance calculation under all operating conditions are performed sequentially. The goal is to achieve the optimal comprehensive performance of the entire engine under all operating conditions, with other design parameters serving as constraints for iterative optimization. The turbine stage number corresponding to the highest comprehensive performance under all operating conditions is selected. These other design parameters include load coefficient, flow coefficient, and reaction force. The preferred constraints are: load coefficient of 2–3, flow coefficient of 0.8–1.2, and reaction force of 0.4–0.65. Preferably, when the power level is 5000kW–6000kW, a 4-stage turbine is used.

[0084] Optionally, when designing the inverse problem, if the variable speed power turbine has three or more stages, the power distribution ratio is set as: intermediate stage > first stage > last stage. This allows the outlet temperature of the first stage guide vane to be relatively low, and the load on the last stage to be relatively light, which can provide better inflow conditions for the downstream exhaust support plate, thereby reducing exhaust losses.

[0085] Optionally, when performing inverse problem design, setting the outlet Mach number of the variable speed power turbine to 0.4 to 0.75 can effectively reduce residual speed loss at low speeds, increase the turbine expansion ratio, and increase turbine output power to ensure that the turbine output power remains unchanged after the speed decreases.

[0086] It is understood that, in another embodiment of the present invention, based on a certain speed state within the target speed range (i.e., the initially selected design speed point), inverse problem design, forward problem calculation and analysis, and comprehensive performance calculation under all operating conditions can be performed sequentially to obtain the comprehensive performance under all operating conditions corresponding to that speed state. Then, the next speed state is selected as the design speed point, and inverse problem design, forward problem calculation and analysis, and comprehensive performance calculation under all operating conditions are performed sequentially to obtain the comprehensive performance under all operating conditions corresponding to the next speed state. This calculation is performed iteratively to obtain the comprehensive performance under all operating conditions corresponding to several speed states within the target speed range, and then the speed state with the highest comprehensive performance under all operating conditions is selected iteratively as the final design speed point. Alternatively, several speed states can be selected simultaneously from the target speed range, and then inverse problem design, forward problem calculation and analysis, and comprehensive performance calculation under all operating conditions can be performed simultaneously and sequentially on these speed states. Finally, the speed state with the highest comprehensive performance under all operating conditions can be directly compared and selected as the final design speed point.

[0087] It is understood that this invention also employs both the one-dimensional design method for variable-speed power turbines of this application and the conventional one-dimensional design method for power turbines to design variable-speed power turbines, and compares the efficiency curves of the variable-speed power turbines designed by the two methods. The comparison results are as follows: Figure 2 As shown. From Figure 2 It is evident that, within the 50%–100% speed range, the turbine efficiency of the design method of this invention is significantly higher than that of the conventional design method.

[0088] In addition, such as Figure 3 As shown, another embodiment of the present invention also provides a one-dimensional design system for a variable speed power turbine, preferably employing the one-dimensional design method described above, comprising:

[0089] The target speed input module is used to input the target speed range;

[0090] The inverse problem design module is used to perform inverse problem design based on the various speed states within the target speed range, and obtain the one-dimensional geometric parameters of the variable speed power turbine under different speed states;

[0091] The forward problem calculation module is used to perform forward problem calculation and analysis based on one-dimensional geometric parameters under different speed conditions, so as to obtain the turbine characteristics of the variable speed power turbine under different speed conditions;

[0092] The design point selection module is used to calculate the overall performance of the variable speed power turbine under different operating conditions based on the turbine characteristics under different speed conditions, and select the speed condition with the highest overall performance under different operating conditions as the design speed point.

[0093] It is understood that the one-dimensional design system for the variable-speed turbine in this embodiment can input a target speed range according to the mission requirements of the high-speed rotorcraft, and then perform inverse problem calculations for each speed state within the target speed range to obtain the one-dimensional geometric parameters of the variable-speed turbine under different speed states. Then, based on the one-dimensional geometric parameters under the same speed state, forward problem calculations and analyses are performed to obtain the turbine characteristics of the variable-speed turbine under different speed states. Finally, based on the turbine characteristics under different speed states, the overall performance of the variable-speed turbine under different operating conditions is calculated, and the speed state with the highest overall performance under all operating conditions is selected as the design speed point. The one-dimensional design system for the variable-speed turbine of this invention iteratively optimizes the design speed point by calculating the overall performance of the variable-speed turbine under all operating conditions. It considers the characteristics of the wide operating range of the variable-speed turbine, establishes a comprehensive performance evaluation index and system suitable for the operating characteristics of the variable-speed turbine, accurately reflects the comprehensive performance of the variable-speed turbine throughout the entire mission cycle, and accurately evaluates and predicts the full-mission performance of the variable-speed turbine. This can achieve the goal of efficient aerodynamic design of the variable-speed turbine under a wide operating range and meet the design requirements for stable and efficient operation of the variable-speed turbine over a wide range of operating conditions.

[0094] It is understood that the design point selection module calculates the overall performance of the variable speed power turbine under all operating conditions based on the following formula:

[0095]

[0096] Where ξ represents the comprehensive performance evaluation index of the variable speed power turbine, and η i t represents the efficiency of a variable-speed power turbine at speed i. i This represents the operating time of the variable speed power turbine at speed i, where T is the total operating time of the variable speed power turbine, and w i W represents the fuel consumption flow rate of a variable-speed power turbine at speed i. design This indicates the design fuel flow rate at different engine speeds.

[0097] It is understandable that the efficiency of a variable-speed power turbine can be calculated based on the following formula:

[0098]

[0099] Where u represents the load factor, D 2m Indicates the ratio of the inlet and outlet diameters. Ka represents the velocity loss coefficient of the stator blades, and Ka represents the axial speed ratio coefficient. C represents the flow coefficient. 1u U2 represents the circumferential component of the absolute velocity at the inlet, U2 represents the circumferential velocity at the outlet, ψ represents the velocity loss coefficient of the moving blade, and W represents the velocity component of the moving blade. 2u The circumferential component of the relative velocity at the exit.

[0100] It is understood that when performing inverse problem design, the inverse problem design module first initially selects the number of turbine stages, and then sequentially performs inverse problem design, forward problem calculation and analysis, and comprehensive performance calculation under all operating conditions. With the goal of achieving the best comprehensive performance under all operating conditions for the entire engine mission, and with the selection of other design parameters as constraints, iterative optimization is performed to select the number of turbine stages corresponding to the highest comprehensive performance under all operating conditions.

[0101] It is understandable that a 4-stage turbine is used when the power level is between 5000kW and 6000kW.

[0102] It is understood that when the inverse problem design module performs inverse problem design, if the variable speed power turbine has three or more stages, the power distribution ratio is set as: intermediate stage > first stage > last stage.

[0103] It is understood that when performing inverse problem design, the inverse problem design module sets the outlet Mach number of the variable speed power turbine to 0.4 to 0.75.

[0104] It is understood that each module in the system of this embodiment corresponds to each step in the above method embodiment. Therefore, the specific working principle and process of each module will not be repeated here. Please refer to the above method embodiment.

[0105] In addition, another embodiment of the present invention provides an electronic device including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the method described above by calling the computer program stored in the memory.

[0106] In addition, another embodiment of the present invention provides a computer-readable storage medium for storing a computer program for performing one-dimensional design of a variable speed power turbine, wherein the computer program executes the steps of the method described above when run on a computer.

[0107] Common computer-readable storage media include: floppy disks, flexible disks, hard disks, magnetic tapes, any other magnetic media, CD-ROMs, any other optical media, punch cards, paper tape, any other physical media with perforated patterns, random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), flash erasable programmable read-only memory (FLASH-EPROM), any other memory chips or cartridges, or any other media readable by a computer. Instructions may further be transmitted or received by a transmission medium. The term transmission medium can include any tangible or intangible medium used to store, encode, or carry instructions for machine execution, and includes digital or analog communication signals or intangible media that facilitate communication of such instructions. Transmission media include coaxial cables, copper wires, and optical fibers, which contain conductors for transmitting a bus of computer data signals.

[0108] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A one-dimensional design method for a variable-speed power turbine, characterized in that, Includes the following: Enter the target speed range; Based on the inverse problem design of each speed state within the target speed range, one-dimensional geometric parameters of the variable speed power turbine under different speed states are obtained; Based on one-dimensional geometric parameters under different speed conditions, forward problem calculation and analysis are performed to obtain the turbine characteristics of the variable speed power turbine under different speed conditions; The comprehensive performance of the variable speed power turbine under different operating conditions is calculated based on the turbine characteristics under different speed conditions, and the speed condition with the highest comprehensive performance under different operating conditions is selected as the design speed point. The overall performance of the variable speed power turbine under all operating conditions is calculated based on the following formula: ； in, This refers to the comprehensive performance evaluation index of a variable speed power turbine. This represents the efficiency of a variable-speed power turbine at speed i. This represents the operating time of the variable-speed power turbine at speed i, where T is the total operating time of the variable-speed power turbine. This represents the fuel consumption flow rate of the variable speed power turbine at speed i. Indicates the design fuel flow rate at different engine speeds; The efficiency of a variable-speed power turbine is calculated based on the following formula: ； in, Indicates the load factor. Indicates the ratio of the inlet and outlet diameters. This represents the velocity loss coefficient of the stator blades. Indicates the axial speed ratio coefficient. Indicates the flow coefficient. The circumferential component of the absolute velocity of the inlet. Indicates the exit circumferential speed. This represents the velocity loss coefficient of the moving blade. The circumferential component of the relative velocity at the exit.

2. The one-dimensional design method for a variable-speed power turbine as described in claim 1, characterized in that, When performing inverse problem design, the number of turbine stages is initially selected. Then, inverse problem design, forward problem calculation and analysis, and comprehensive performance calculation under all operating conditions are performed in sequence. The goal is to achieve the best comprehensive performance under all operating conditions for the entire engine mission, and the selection of other design parameters is used as a constraint to iteratively optimize and select the number of turbine stages corresponding to the highest comprehensive performance under all operating conditions.

3. The one-dimensional design method for a variable-speed power turbine as described in claim 2, characterized in that, When the power level is 5000kW~6000kW, a 4-stage turbine is used.

4. The one-dimensional design method for a variable-speed power turbine as described in claim 1, characterized in that, When designing the inverse problem, if the variable speed power turbine has three or more stages, the power distribution ratio is set as follows: intermediate stage > first stage > last stage.

5. The one-dimensional design method for a variable-speed power turbine as described in claim 1, characterized in that, When performing inverse problem design, the outlet Mach number of the variable speed power turbine is set to 0.4~0.

75.

6. A one-dimensional design system for a variable-speed power turbine, employing the one-dimensional design method for a variable-speed power turbine as described in any one of claims 1 to 5, characterized in that, include: The target speed input module is used to input the target speed range; The inverse problem design module is used to perform inverse problem design based on the various speed states within the target speed range, and obtain the one-dimensional geometric parameters of the variable speed power turbine under different speed states; The forward problem calculation module is used to perform forward problem calculation and analysis based on one-dimensional geometric parameters under different speed conditions, so as to obtain the turbine characteristics of the variable speed power turbine under different speed conditions; The design point selection module is used to calculate the overall performance of the variable speed power turbine under different operating conditions based on the turbine characteristics under different speed conditions, and select the speed condition with the highest overall performance under different operating conditions as the design speed point.

7. An electronic device, characterized in that, The method includes a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the method as described in any one of claims 1 to 5 by calling the computer program stored in the memory.

8. A computer-readable storage medium for storing a computer program for one-dimensional design of a variable-speed power turbine, characterized in that, The computer program, when run on a computer, performs the steps of the method as described in any one of claims 1 to 5.

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