Three-dimensional flow guide structure, design method and system for turbine blade sector cascade test

Abstract

The application provides a three-dimensional flow guide structure for turbine blade sector cascade test, a design method and a system, the method comprising: obtaining an inlet flow angle of a plurality of radial sections of a test blade, determining a plurality of fairing flow guide curves, constructing a fairing three-dimensional surface, and constructing a three-dimensional surface sector based on the plurality of circumferentially arranged fairing three-dimensional surfaces; judging whether a three-dimensional flow field of the three-dimensional surface sector meets the inlet flow angle requirement of the test blade; if yes, the design is completed; if not, parameters are adjusted until the requirement is met and the design is completed; the method constructs a three-dimensional surface sector to form a three-dimensional flow field, so that the outlet flow angle of the three-dimensional flow guide structure meets the inlet flow angle requirement of the whole test blade, thereby simulating the theoretical state of the test blade at all radial positions of the test blade, and improving the effectiveness of the test result and the utilization rate of the test result.

Description

Three-dimensional guide structure, design method and system for turbine blade fan-shaped cascade experiments Technical Field

[0001] This invention belongs to the technical field of turbine blade testing and research for aero-engines and gas turbines, specifically relating to a three-dimensional flow guiding structure, design method, and system for turbine blade fan-shaped cascade testing. Background Technology

[0002] While turbine blades are actually constructed as a full-ring structure, to reduce testing difficulty and save costs, some tests can be conducted using only a portion of the ring, simplified to a fan-shaped blade cascade, based on the turbine blade testing requirements. Examples include tests related to blade cooling, such as film cooling effect tests, comprehensive cooling effect tests, flow characteristic tests, and external heat transfer tests. The inlet of the fan-shaped blade cascade test section is typically connected to a straight guide vane, providing the required inlet airflow angle. This inlet airflow angle formed by the straight guide vane is a fixed, single angle, which is approximately acceptable for guide vanes. However, for rotor blades, the relatively large variation in the inlet airflow angle in the radial direction leads to significant differences between the experimental and theoretical conditions.

[0003] Currently, the common approach in fan-shaped blade cascade experiments is to use a straight guide vane to create the inlet airflow angle. This fixed airflow angle is generally chosen as the mid-section of the blade to ensure that the airflow angle at the mid-section matches the theoretical state. The experimental results are also only extracted from the mid-section. This approach has two drawbacks:

[0004] 1) Complete full-blade test results cannot be obtained, resulting in poor comprehensiveness of test verification;

[0005] 2) Only intermediate section test results can be used, resulting in low test utilization. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, this invention proposes a three-dimensional flow guiding structure design method for turbine blade fan-shaped cascade experiments, comprising:

[0007] Obtain the inlet airflow angles of multiple radial sections of the test blade;

[0008] Based on the inlet airflow angles of the multiple radial sections, multiple smooth guide curves are determined; the starting tangent direction of each smooth guide curve is the same as the air supply airflow direction of the fan-shaped blade test, and the ending tangent direction of each smooth guide curve is the same as the inlet airflow angle direction of the corresponding radial section.

[0009] A smooth three-dimensional surface is constructed based on multiple smooth flow guide curves, and a three-dimensional surface sector is constructed based on multiple smooth three-dimensional surfaces arranged circumferentially.

[0010] A three-dimensional flow field simulation calculation is performed on the three-dimensional curved surface sector to obtain the three-dimensional flow field of the three-dimensional curved surface sector;

[0011] Determine whether the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade; if it does, use the three-dimensional curved fan segment as the geometric model of the three-dimensional guide structure to complete the design; if it does not meet the requirement, adjust the parameters of the three-dimensional curved fan segment until the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade to complete the design of the three-dimensional guide structure.

[0012] Preferably, adjusting the parameters of the three-dimensional curved sector until the three-dimensional flow field of the three-dimensional curved sector meets the inlet airflow angle requirement of the test blade includes:

[0013] Adjust the number of smooth three-dimensional surfaces in the three-dimensional curved surface sector to obtain a new three-dimensional curved surface sector, and repeat the simulation calculation and judgment until the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirement of the test blade;

[0014] When adjusting only the number of smooth three-dimensional surfaces in the three-dimensional curved sector cannot meet the inlet airflow angle requirement, adjust the length of at least one of the smooth guide curves and reconstruct the three-dimensional curved sector. Repeatedly perform simulation calculations and judgments until the three-dimensional flow field of the three-dimensional curved sector meets the inlet airflow angle requirement of the test blade.

[0015] Preferably, the initial design number of smooth three-dimensional curved surfaces in the three-dimensional curved sector is the same as the number of test blades in the sector blade cascade test.

[0016] Preferably, the initial design length of each of the smooth guide curves is determined based on the chord length of the test blade.

[0017] Preferably, adjusting the number of smoothed three-dimensional surfaces in the three-dimensional surface sector includes:

[0018] Increase the number of smooth three-dimensional surfaces in the three-dimensional surface sector according to the set increment;

[0019] The number of increases is at least once;

[0020] The maximum number of smooth three-dimensional surfaces in the three-dimensional curved surface sector is twice the number of the test blades.

[0021] Preferably, adjusting the length of at least one of the smoothing guide curves includes:

[0022] The length of the smoothed flow guide curve may be increased or decreased according to the starting tangent direction and the ending tangent direction of at least one of the smoothed flow guide curves.

[0023] Preferably, determining whether the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade includes:

[0024] Calculate the deviation between the outlet airflow angle of the three-dimensional curved fan segment and the inlet airflow angle of the test blade in the three-dimensional flow field, and determine whether the deviation meets the set allowable deviation range requirements.

[0025] Preferably, the step of constructing a smooth three-dimensional surface based on multiple smooth flow guide curves includes:

[0026] Based on the positions and spacing of the multiple radial sections, the corresponding multiple smooth flow guiding curves are arranged;

[0027] Using the arranged smooth flow guide curves as contour lines, a smooth three-dimensional surface is constructed through surface fitting.

[0028] Based on the same inventive concept, the present invention also provides a three-dimensional flow guiding structure for turbine blade fan-shaped cascade testing, comprising:

[0029] Multiple curved guide vanes are arranged in the guide channel;

[0030] The shape, number, and arrangement of the multi-curved guide vanes are determined based on the shape, number, and arrangement of the smooth three-dimensional curved surfaces in the geometric model;

[0031] The smoothed three-dimensional surface and the geometric model are the smoothed three-dimensional surface and geometric model in the design method described above.

[0032] Based on the same inventive concept, this invention also provides a three-dimensional flow guiding structure design system for turbine blade fan-shaped cascade testing, comprising:

[0033] The data acquisition module is used to acquire the inlet airflow angles of multiple radial sections of the test blade;

[0034] The curve determination module is used to determine multiple smooth guide curves based on the inlet airflow angles of multiple radial sections; the starting tangent direction of each smooth guide curve is the same as the air supply airflow direction of the fan-shaped blade test, and the ending tangent direction of each smooth guide curve is the same as the inlet airflow angle direction of the corresponding radial section.

[0035] The sector construction module is used to construct a smooth three-dimensional surface based on multiple smooth flow guide curves, and to construct three-dimensional surface sectors based on multiple smooth three-dimensional surfaces arranged in a circumferential direction.

[0036] The simulation module is used to perform three-dimensional flow field simulation calculations on the three-dimensional curved surface sector to obtain the three-dimensional flow field of the three-dimensional curved surface sector;

[0037] The judgment and adjustment module is used to determine whether the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade. If it does, the three-dimensional curved fan segment is used as the geometric model of the three-dimensional guide structure to complete the design. If it does not meet the requirement, the parameters of the three-dimensional curved fan segment are adjusted until the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade to complete the design of the three-dimensional guide structure.

[0038] Preferably, the determination and adjustment module includes:

[0039] The first adjustment submodule is used to adjust the number of smooth three-dimensional surfaces in the three-dimensional curved surface sector to obtain a new three-dimensional curved surface sector, and to repeatedly perform simulation calculations and judgments until the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirement of the test blade.

[0040] The second adjustment submodule is used to adjust the length of at least one of the smooth guide curves and reconstruct the three-dimensional curved surface sector when adjusting only the number of smooth three-dimensional curved surfaces in the three-dimensional curved surface sector cannot meet the inlet airflow angle requirement. The simulation calculation and judgment are repeated until the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirement of the test blade.

[0041] Preferably, the initial design number of smooth three-dimensional curved surfaces in the three-dimensional curved sector is the same as the number of test blades in the sector blade cascade test.

[0042] Preferably, the initial design length of each of the smooth guide curves is determined based on the chord length of the test blade.

[0043] Preferably, the first adjustment submodule is specifically used for:

[0044] Increase the number of smooth three-dimensional surfaces in the three-dimensional surface sector according to the set increment;

[0045] The number of increases is at least once;

[0046] The maximum number of smooth three-dimensional surfaces in the three-dimensional curved surface sector is twice the number of the test blades.

[0047] Preferably, the second adjustment submodule is specifically used for:

[0048] The length of the smoothed flow guide curve may be increased or decreased according to the starting tangent direction and the ending tangent direction of at least one of the smoothed flow guide curves.

[0049] Preferably, the judgment and adjustment module further includes:

[0050] The judgment submodule is used to calculate the deviation between the outlet airflow angle of the three-dimensional curved fan segment and the inlet airflow angle of the test blade in the three-dimensional flow field, and to determine whether the deviation meets the set allowable deviation range requirements.

[0051] Preferably, the sector construction module is specifically used for:

[0052] Based on the positions and spacing of the multiple radial sections, the corresponding multiple smooth flow guiding curves are arranged;

[0053] Using the arranged smooth flow guide curves as contour lines, a smooth three-dimensional surface is constructed through surface fitting.

[0054] Based on the same inventive concept, the present invention also provides a computer device, comprising: one or more processors;

[0055] Memory, used to store one or more programs;

[0056] When the one or more programs are executed by the one or more processors, a three-dimensional flow guide structure design method for turbine blade fan-shaped cascade experiments is implemented as described above.

[0057] Based on the same inventive concept, the present invention also provides a computer-readable storage device having a computer program stored thereon, wherein when the computer program is executed, it implements the three-dimensional flow guide structure design method for turbine blade fan-shaped cascade test as described above.

[0058] Compared with the closest existing technology, the present invention has the following beneficial effects:

[0059] This invention provides a three-dimensional flow guiding structure, design method, and system for turbine blade fan-shaped cascade testing. The method includes: obtaining the inlet airflow angles of multiple radial sections of the test blade; determining multiple smooth flow guiding curves based on the inlet airflow angles of the multiple radial sections; the starting tangent direction of each smooth flow guiding curve is the same as the airflow direction of the fan-shaped cascade test, and the ending tangent direction of each smooth flow guiding curve is the same as the inlet airflow angle direction of the corresponding radial section; constructing a smooth three-dimensional surface based on the multiple smooth flow guiding curves, and constructing a three-dimensional surface fan segment based on the multiple circumferentially arranged smooth three-dimensional surfaces; performing three-dimensional flow field simulation calculations on the three-dimensional surface fan segment to obtain the three-dimensional flow field of the three-dimensional surface fan segment; and determining whether the three-dimensional flow field of the three-dimensional surface fan segment is... The method determines whether the inlet airflow angle requirement of the test blade is met. If it is, the three-dimensional curved sector is used as the geometric model of the three-dimensional guide structure to complete the design. If it is not, the parameters of the three-dimensional curved sector are adjusted until the three-dimensional flow field of the three-dimensional curved sector meets the inlet airflow angle requirement of the test blade, thus completing the design of the three-dimensional guide structure. This method constructs a three-dimensional flow field by designing and building a three-dimensional curved sector, so that the outlet airflow angle of the three-dimensional guide structure meets the overall inlet airflow angle requirement of the test blade. This allows the theoretical state of the test blade to be simulated at all radial positions. This makes the simulation of the inlet flow field of the test blade more accurate, improves the effectiveness and utilization of the test results, obtains more test data in a single test, and indirectly reduces the test cost. Attached Figure Description

[0060] Figure 1 is a schematic flowchart of a three-dimensional flow guide structure design method for turbine blade fan-shaped cascade testing provided by the present invention;

[0061] Figure 2 is a schematic diagram of a three-dimensional flow guiding structure for turbine blade fan-shaped cascade testing provided by the present invention;

[0062] Figure 3 is a top view of the inlet section and guide section provided by the present invention;

[0063] Figure 4 is a schematic diagram of a three-dimensional flow guiding structure design system for turbine blade fan-shaped cascade testing provided by the present invention.

[0064] Figure 5 is a schematic diagram of an electronic device structure provided by the present invention;

[0065] Among them, 1. Guide channel; 2. Multi-curved guide plate; 3. Inlet section; 4. Blade cascade test section; 5. Test blade. Detailed Implementation

[0066] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0067] Example 1

[0068] The present invention provides a three-dimensional flow guiding structure design method for turbine blade sector cascade experiments, as shown in Figure 1, comprising:

[0069] S1. Obtain the inlet airflow angle of multiple radial sections of the test blade;

[0070] S2. Based on the inlet airflow angles of the multiple radial sections, determine multiple smooth guide curves; the starting tangent direction of each smooth guide curve is the same as the airflow direction of the fan-shaped blade test, and the ending tangent direction of each smooth guide curve is the same as the inlet airflow angle direction of the corresponding radial section.

[0071] S3. Based on multiple smooth flow guide curves, a smooth three-dimensional surface is constructed, and based on multiple smooth three-dimensional surfaces arranged in a circumferential direction, a three-dimensional surface sector is constructed.

[0072] S4. Perform three-dimensional flow field simulation calculation on the three-dimensional curved surface sector to obtain the three-dimensional flow field of the three-dimensional curved surface sector;

[0073] S5. Determine whether the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade; if it does, use the three-dimensional curved fan segment as the geometric model of the three-dimensional guide structure to complete the design; if it does not meet the requirement, adjust the parameters of the three-dimensional curved fan segment until the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade to complete the design of the three-dimensional guide structure.

[0074] To address the issue of a single inlet airflow angle in fan-shaped blade tests, this invention designs and constructs a three-dimensional curved fan segment to form a three-dimensional flow field. This ensures that the outlet airflow angle of the three-dimensional guide structure meets the overall inlet airflow angle requirements of the test blade, thereby simulating the theoretical state of the test blade at all radial positions. This makes the simulation of the inlet flow field of the test blade more accurate, improves the effectiveness and utilization of the test results, and allows for more test data to be obtained in a single test, indirectly reducing test costs.

[0075] It should be noted that, depending on the different structures and requirements of the test blades, the designed geometric model can take different forms, thereby ensuring that the three-dimensional flow guide structure produced according to the geometric model has an outlet airflow angle in the radial direction that is consistent with the inlet airflow angle required by the test blade.

[0076] Considering the mainstream inlet parameter requirements of the test blade, in S1 above, n radial sections of the test blade are selected, where n is the number of sections of the test blade that are required to maintain the inlet airflow angle. Then, the inlet airflow angle of each radial section is extracted from the mainstream inlet parameters of the test blade to complete the data acquisition. For example, n≥5.

[0077] To ensure the three-dimensional guide structure meets the inlet airflow angle requirements of each radial section, S2 needs to be designed individually for each inlet airflow angle, resulting in a smooth spline curve for each radial section, serving as the smooth guide curve. The smooth guide curve acts as an airflow deflector, its task being to smoothly and seamlessly transform the upstream, fixed-direction parallel airflow (the supply airflow for the fan-shaped blade test) into the inlet airflow at the specific angle required by the test blade at that radial section.

[0078] Specifically, in S2 above, the starting and ending tangent directions of the smoothed guide curves are restricted. Meanwhile, in this embodiment, the initial design length of each smoothed guide curve is determined based on the chord length of the test blade; specifically, the initial design length of the smoothed guide curve can be approximately equal to the chord length of the test blade, avoiding large-angle bends. This is the physical prerequisite for ensuring airflow adhesion, preventing separation, and thus forming a high-quality three-dimensional flow field.

[0079] In this embodiment, the initial design number of smooth three-dimensional curved surfaces in the three-dimensional curved sector is the same as the number of test blades in the sector blade cascade experiment.

[0080] It should be noted that the length and number of smooth guide curves are adjustable parameters in the design process. By clarifying the initial design length and number in the design process of the above initial parameters, the subsequent iterative optimization process has a clear starting point and adjustment direction, thereby efficiently and reliably obtaining a geometric model design that meets the airflow angle requirements.

[0081] In this embodiment, when constructing a smooth three-dimensional surface based on multiple smooth flow guide curves in S3 above, it may include:

[0082] Based on the positions and spacing of the multiple radial sections, the corresponding multiple smooth flow guiding curves are arranged;

[0083] Using the arranged smooth flow guide curves as contour lines, a smooth three-dimensional surface is constructed through surface fitting.

[0084] It should be noted that the multiple smooth flow guiding curves can be arranged proportionally according to the positions and spacing of multiple radial sections, or the spatial relationship between the multiple smooth flow guiding curves can be determined by other equivalent mathematical methods based on the positions and spacing of multiple radial sections.

[0085] When performing three-dimensional flow field simulation calculations in S4 above, it is necessary to set simulation boundary conditions with reference to the actual installation of the multi-curved guide vanes 2 in Figures 2 and 3. In actual installation, multiple multi-curved guide vanes 2 are circumferentially installed in the fan-shaped guide channel 1. The inlet and wall of the guide channel 1, as well as the wall of the multi-curved guide vanes 2, are the key boundaries. Three-dimensional flow field simulation calculations can be performed using numerical simulation software such as CFX or FLUENT. This can accurately simulate and calculate the three-dimensional flow field and outlet airflow angle of the three-dimensional curved fan segment, providing an objective and quantitative data basis for subsequent judgment on whether the design of the three-dimensional guide structure meets the aerodynamic performance requirements of the test blades.

[0086] In this embodiment, when determining whether the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade in S5 above, it may include:

[0087] Calculate the deviation between the outlet airflow angle of the three-dimensional curved fan segment and the inlet airflow angle of the test blade in the three-dimensional flow field, and determine whether the deviation meets the set allowable deviation range requirements.

[0088] Specifically, the outlet airflow angle of the simulated three-dimensional curved fan segment is used as the inlet airflow angle for the experiment, and the allowable deviation from the theoretically required inlet airflow angle of the test blade is calculated. For example, the deviation is allowed to be 1%, meaning the allowable deviation range is required to be no more than 1%.

[0089] In S5 above, the parameters of the three-dimensional curved surface sector are adjusted, including the number of smoothed three-dimensional curved surfaces and / or the length of the smoothed flow guide curve.

[0090] In this embodiment, adjusting the parameters of the three-dimensional curved surface sector in S5 until the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirement of the test blade can include:

[0091] S501. Adjust the number of smooth three-dimensional surfaces in the three-dimensional curved surface sector to obtain a new three-dimensional curved surface sector, and perform simulation calculations and judgments repeatedly until the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirement of the test blade.

[0092] S502. When adjusting only the number of smooth three-dimensional surfaces in the three-dimensional curved fan segment cannot meet the inlet airflow angle requirement, adjust the length of at least one of the smooth guide curves and reconstruct the three-dimensional curved fan segment. Repeatedly perform simulation calculations and judgments until the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade.

[0093] It should be noted that in S502, after adjusting the length of the smoothing guide curve, the smoothing three-dimensional surface is updated, and it is necessary to return to S3. The three-dimensional surface sector is reconstructed according to the initial design quantity of the smoothing three-dimensional surface, and the simulation calculation and judgment are repeated. If the design requirements are still not met at this time, S501 is executed based on the adjusted length of the smoothing guide curve. When the number of smoothing three-dimensional surfaces is increased to the upper limit and the design requirements are still not met, the length of the smoothing guide curve is readjusted again until the three-dimensional flow field of the three-dimensional surface sector meets the inlet airflow angle requirement of the test blade.

[0094] In this embodiment, adjusting the number of smooth three-dimensional surfaces in the three-dimensional surface sector in S501 above may include:

[0095] Increase the number of smooth three-dimensional surfaces in the three-dimensional surface sector according to the set increment;

[0096] The number of increases is at least once;

[0097] The maximum number of smooth three-dimensional surfaces in the three-dimensional curved surface sector is twice the number of the test blades.

[0098] For example, the increment is set to 1. Each time the quantity is adjusted, a smooth three-dimensional surface is added and the simulation is re-performed until the upper limit of the quantity is reached or the three-dimensional flow field of the three-dimensional surface sector meets the inlet airflow angle requirement of the test blade.

[0099] In this embodiment, adjusting the length of at least one of the smooth flow guiding curves in S502 above may include:

[0100] The length of the smoothed flow guide curve may be increased or decreased according to the starting tangent direction and the ending tangent direction of at least one of the smoothed flow guide curves.

[0101] It should be noted that since the solution of the smooth three-dimensional curved surface is not unique, the length of the smooth guide curve may increase or decrease during the adjustment process, while avoiding large-angle bends in the curve. Following the adjustment sequence of S5, different attempts are made and then simulation calculations are performed to ensure that the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirements of the test blade.

[0102] Example 2

[0103] Based on the same inventive concept, this invention also provides a three-dimensional flow guiding structure for turbine blade fan-shaped cascade testing, as shown in Figures 2 and 3, comprising:

[0104] Multiple curved guide vanes 2 are arranged in the guide channel 1;

[0105] The shape, quantity, and arrangement of the multi-curved guide vanes 2 are determined based on the shape, quantity, and arrangement of the smooth three-dimensional curved surfaces in the geometric model;

[0106] The smooth three-dimensional surface and the geometric model are the smooth three-dimensional surface and geometric model in the above embodiment of a three-dimensional flow guide structure design method for turbine blade fan-shaped cascade test.

[0107] Specifically, guided by the geometric model, the multi-curved guide vane 2 is manufactured according to the smooth three-dimensional curved surface in the geometric model. The guide channel 1 connects the inlet section 3 and the blade test section 4. The axial airflow of the fan-shaped blade test, i.e., the mainstream, enters the guide channel 1 through the fan-shaped channel of the inlet section 3. Figure 2 shows the cross-sectional positional relationship of the inlet section 3, the guide channel 1, and the blade test section 4, as well as the positional arrangement of the multi-curved guide vane 2 in the guide channel 1. The guide channel 1 is also a fan-shaped channel. Multiple multi-curved guide vanes 2 are arranged circumferentially along the guide channel 1, as shown in Figure 3. These multiple multi-curved guide vanes 2 divide the guide channel 1 into multiple airflow channels, forcibly turning the mainstream to form the designed three-dimensional flow field, achieving a correspondence between the outlet airflow angle of the guide channel 1 and the inlet airflow angle required by the test blade 5. At this time, the intake conditions experienced by each radial section of the test blade 5 from the blade root to the blade tip are highly consistent with its designed requirements.

[0108] It should be noted that the multi-curved guide plate 2 is specifically a multi-curved thin plate.

[0109] Example 3

[0110] Based on the same inventive concept, this invention also provides a three-dimensional flow guiding structure design system for turbine blade fan-shaped cascade testing, as shown in Figure 4, comprising:

[0111] The data acquisition module is used to acquire the inlet airflow angles of multiple radial sections of the test blade;

[0112] The curve determination module is used to determine multiple smooth guide curves based on the inlet airflow angles of multiple radial sections; the starting tangent direction of each smooth guide curve is the same as the air supply airflow direction of the fan-shaped blade test, and the ending tangent direction of each smooth guide curve is the same as the inlet airflow angle direction of the corresponding radial section.

[0113] The sector construction module is used to construct a smooth three-dimensional surface based on multiple smooth flow guide curves, and to construct three-dimensional surface sectors based on multiple smooth three-dimensional surfaces arranged in a circumferential direction.

[0114] The simulation module is used to perform three-dimensional flow field simulation calculations on the three-dimensional curved surface sector to obtain the three-dimensional flow field of the three-dimensional curved surface sector;

[0115] The judgment and adjustment module is used to determine whether the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade. If it does, the three-dimensional curved fan segment is used as the geometric model of the three-dimensional guide structure to complete the design. If it does not meet the requirement, the parameters of the three-dimensional curved fan segment are adjusted until the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade to complete the design of the three-dimensional guide structure.

[0116] In this embodiment, the determination and adjustment module includes:

[0117] The first adjustment submodule is used to adjust the number of smooth three-dimensional surfaces in the three-dimensional curved surface sector to obtain a new three-dimensional curved surface sector, and to repeatedly perform simulation calculations and judgments until the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirement of the test blade.

[0118] The second adjustment submodule is used to adjust the length of at least one of the smooth guide curves and reconstruct the three-dimensional curved surface sector when adjusting only the number of smooth three-dimensional curved surfaces in the three-dimensional curved surface sector cannot meet the inlet airflow angle requirement. The simulation calculation and judgment are repeated until the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirement of the test blade.

[0119] In this embodiment, the initial design number of smooth three-dimensional curved surfaces in the three-dimensional curved sector is the same as the number of test blades in the sector blade cascade experiment.

[0120] In this embodiment, the initial design length of each smooth guide curve is determined based on the chord length of the test blade.

[0121] In this embodiment, the first adjustment submodule is specifically used for:

[0122] Increase the number of smooth three-dimensional surfaces in the three-dimensional surface sector according to the set increment;

[0123] The number of increases is at least once;

[0124] The maximum number of smooth three-dimensional surfaces in the three-dimensional curved surface sector is twice the number of the test blades.

[0125] In this embodiment, the second adjustment submodule is specifically used for:

[0126] The length of the smoothed flow guide curve may be increased or decreased according to the starting tangent direction and the ending tangent direction of at least one of the smoothed flow guide curves.

[0127] In this embodiment, the determination and adjustment module further includes:

[0128] The judgment submodule is used to calculate the deviation between the outlet airflow angle of the three-dimensional curved fan segment and the inlet airflow angle of the test blade in the three-dimensional flow field, and to determine whether the deviation meets the set allowable deviation range requirements.

[0129] In this embodiment, the sector construction module is specifically used for:

[0130] Based on the positions and spacing of the multiple radial sections, the corresponding multiple smooth flow guiding curves are arranged;

[0131] Using the arranged smooth flow guide curves as contour lines, a smooth three-dimensional surface is constructed through surface fitting.

[0132] Example 4

[0133] As shown in Figure 5, the present invention also provides an electronic device, which may be a computer device, a microcontroller device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, processor, and transceiver component are connected via a bus; the memory can be used to store executable programs, and an exemplary executable program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, which can be accessed and / or modified when instructions are executed.

[0134] The processor may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and it is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to realize the corresponding method flow or corresponding function, so as to realize the steps of the three-dimensional guide structure design method for turbine blade fan-shaped cascade test in the above embodiment.

[0135] Example 5

[0136] Based on the same inventive concept, this invention also provides a readable storage device, specifically an electronic device readable storage medium (Memory). This readable storage medium is a memory device within an electronic device used to store programs and data. It is understood that the storage medium here can include both built-in storage media within the electronic device and extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more executable programs (including program code). It should be noted that the storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. Loading and executing one or more instructions stored in the storage medium by the processor can implement the steps of the three-dimensional guide structure design method for turbine blade fan-shaped cascade experiments described in the above embodiments.

[0137] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0138] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more blocks of the flowchart illustrations and / or one or more blocks of the block diagrams.

[0139] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0140] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims of the present invention.

Claims

1. A three-dimensional flow guiding structure design method for turbine blade fan-shaped cascade experiments, characterized in that, include: The process involves obtaining the inlet airflow angles of multiple radial sections of the test blade; determining multiple smooth guide curves based on these radial section inlet airflow angles; the starting tangent direction of each smooth guide curve is the same as the airflow direction of the fan-shaped blade test, and the ending tangent direction of each smooth guide curve is the same as the inlet airflow angle direction of the corresponding radial section; constructing a smooth three-dimensional surface based on the multiple smooth guide curves, and constructing a three-dimensional surface fan segment based on the multiple circumferentially arranged smooth three-dimensional surfaces; performing three-dimensional flow field simulation calculations on the three-dimensional surface fan segment to obtain its three-dimensional flow field; determining whether the three-dimensional flow field of the three-dimensional surface fan segment meets the inlet airflow angle requirements of the test blade; if it does, using the three-dimensional surface fan segment as the geometric model of the three-dimensional guide structure to complete the design; if it does not meet the requirements, then performing parameter analysis on the three-dimensional surface fan segment. The parameters of the three-dimensional curved surface sector are adjusted until the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirement of the test blade, thus completing the three-dimensional guide structure design. This adjustment includes: adjusting the number of smoothed three-dimensional surfaces in the three-dimensional curved surface sector to obtain a new three-dimensional curved surface sector, and repeatedly performing simulation calculations and judgments until the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirement of the test blade; when adjusting only the number of smoothed three-dimensional surfaces in the three-dimensional curved surface sector cannot meet the inlet airflow angle requirement, the length of at least one of the smoothed guide curves is adjusted, and the three-dimensional curved surface sector is reconstructed, repeatedly performing simulation calculations and judgments until the three-dimensional flow field of the three-dimensional curved surface sector meets the inlet airflow angle requirement of the test blade.

2. The method as described in claim 1, characterized in that, The initial design number of smooth three-dimensional curved surfaces in the three-dimensional curved sector is the same as the number of test blades in the sector blade cascade test.

3. The method as described in claim 1 or 2, characterized in that, The initial design length of each of the smoothed flow guide curves is determined based on the chord length of the test blade.

4. The method as described in claim 2, characterized in that, Adjusting the number of smooth three-dimensional surfaces in the three-dimensional curved surface sector includes: increasing the number of smooth three-dimensional surfaces in the three-dimensional curved surface sector according to a set increment; the number of increases is at least once; the upper limit of the number of smooth three-dimensional surfaces in the three-dimensional curved surface sector is twice the number of test blades.

5. The method as described in claim 3, characterized in that, Adjusting the length of at least one of the smoothed flow guide curves includes: increasing or decreasing the length of the smoothed flow guide curve according to the starting tangent direction and the ending tangent direction of the at least one smoothed flow guide curve.

6. The method as described in claim 1, characterized in that, The step of determining whether the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade includes: calculating the deviation between the outlet airflow angle of the three-dimensional curved fan segment in the three-dimensional flow field and the inlet airflow angle of the test blade, and determining whether the deviation meets the set allowable deviation range requirement.

7. The method as described in claim 1, characterized in that, The process of constructing a smooth three-dimensional surface based on multiple smooth flow guide curves includes: arranging the corresponding multiple smooth flow guide curves based on the positions and spacing of multiple radial sections; using the arranged multiple smooth flow guide curves as contour lines, and constructing a smooth three-dimensional surface through surface fitting.

8. A three-dimensional flow guiding structure for testing turbine blade fan-shaped cascades, characterized in that, include: Multiple curved guide plates are arranged in the flow channel; the shape, number and arrangement of the curved guide plates are determined according to the shape, number and arrangement of the smooth three-dimensional curved surface in the geometric model; the smooth three-dimensional curved surface and the geometric model are the smooth three-dimensional curved surface and geometric model in the design method of any one of claims 1-7.

9. A three-dimensional flow guiding structure design system for turbine blade fan-shaped cascade experiments, characterized in that, include: The data acquisition module is used to acquire the inlet airflow angles of multiple radial sections of the test blade; The curve determination module is used to determine multiple smooth guide curves based on the inlet airflow angles of multiple radial sections; the starting tangent direction of each smooth guide curve is the same as the air supply airflow direction of the fan-shaped blade test, and the ending tangent direction of each smooth guide curve is the same as the inlet airflow angle direction of the corresponding radial section; the fan segment construction module is used to construct a smooth three-dimensional surface based on multiple smooth guide curves, and construct a three-dimensional surface fan segment based on multiple circumferentially arranged smooth three-dimensional surfaces; The simulation module is used to perform three-dimensional flow field simulation calculations on the three-dimensional curved fan segment to obtain the three-dimensional flow field of the three-dimensional curved fan segment; the judgment and adjustment module is used to determine whether the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade; if it meets the requirement, the three-dimensional curved fan segment is used as the geometric model of the three-dimensional guide structure to complete the design; if it does not meet the requirement, the parameters of the three-dimensional curved fan segment are adjusted until the three-dimensional flow field of the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade to complete the design of the three-dimensional guide structure; the parameter adjustment of the three-dimensional curved fan segment is performed until the three-dimensional curved fan segment meets the inlet airflow angle requirement of the test blade to complete the design of the three-dimensional guide structure. The three-dimensional flow field satisfies the inlet airflow angle requirement of the test blade, including: adjusting the number of smooth three-dimensional surfaces in the three-dimensional curved fan segment to obtain a new three-dimensional curved fan segment, and repeatedly performing simulation calculations and judgments until the three-dimensional flow field of the three-dimensional curved fan segment satisfies the inlet airflow angle requirement of the test blade; when adjusting only the number of smooth three-dimensional surfaces in the three-dimensional curved fan segment cannot satisfy the inlet airflow angle requirement, adjusting the length of at least one of the smooth guide curves, and reconstructing the three-dimensional curved fan segment, repeatedly performing simulation calculations and judgments until the three-dimensional flow field of the three-dimensional curved fan segment satisfies the inlet airflow angle requirement of the test blade.

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