Air inlet channel, air inlet channel design method, equipment and medium

Abstract

The invention relates to the technical field of air inlet channel design, in particular to an air inlet channel, an air inlet channel design method and device and a medium. The air inlet channel comprises a straight pipe section and an arc-shaped section connected with the first end of the straight pipe section, and the arc center of the arc-shaped section is located on the side away from the first face of the arc-shaped section; a preset included angle is formed between the plane where a plurality of target points on the second surface of the arc-shaped section are located and the radial surface of the straight pipe section, the plurality of target points are a plurality of points farthest from the second end of the straight pipe section in the circumferential direction, and the first surface of the arc-shaped section is an extension surface of the outer wall surface of the straight pipe section on the arc-shaped section; and the second surface of the arc-shaped section is an extension surface of the inner wall surface of the straight pipe section on the arc-shaped section. The accuracy and reliability of the research result of the influence of the air inlet channel on the working characteristics of the air compressor determined in the experimental environment can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air intake duct design, and in particular to an air intake duct and an air intake duct design method, device and medium. Background Art

[0002] The working condition of the compressor, as an important component of an aircraft engine, will affect the performance and even safety of the aircraft engine. As the air inlet that transmits air to the compressor, it is particularly important to study the impact of the air inlet on the working characteristics of the compressor for compressor design.

[0003] In the related art, the influence of the air intake duct on the working characteristics of the compressor can be studied in an experimental environment through an air intake duct and a compressor test bench.

[0004] However, the flow characteristics of the inlet under flight conditions and experimental conditions are different. In particular, since the inlet flow under the experimental environment is static flow, the inlet based on the existing geometric structure cannot provide the compressor with an airflow with the same characteristics as in actual flight conditions during the process of studying the impact of the inlet on the working characteristics of the compressor under experimental conditions, resulting in inaccurate research results. Summary of the invention

[0005] The present disclosure is proposed in view of the above problems. The present disclosure provides an air inlet and an air inlet design method, device and medium, which can improve the accuracy and reliability of the research results of the influence of the air inlet on the working characteristics of the compressor determined in an experimental environment.

[0006] According to one aspect of the present disclosure, there is provided an air intake duct, comprising:

[0007] A straight pipe segment, and an arc segment connected to the first end of the straight pipe segment, wherein the arc center of the arc segment is located on a side away from the first surface of the arc segment, and the plane where multiple target points on the second surface of the arc segment are located has a preset angle with the radial surface of the straight pipe segment, wherein the multiple target points are multiple points farthest from the second end of the straight pipe segment in the circumferential direction, the first surface of the arc segment is an extension surface of the outer wall surface of the straight pipe segment on the arc segment, and the second surface of the arc segment is an extension surface of the inner wall surface of the straight pipe segment on the arc segment.

[0008] According to another aspect of the present disclosure, there is provided an air intake duct design method, comprising:

[0009] Establishing an original three-dimensional model of the arc segment of the air inlet duct, and processing the coordinate values ​​of the arc segment in the original three-dimensional model based on an interpolation algorithm to obtain a parameterized model of the arc segment;

[0010] Based on the coordinate values ​​of the arc segment at multiple positions in the arc segment parameterized model and the flow rate of the compressor test bench, determine the pressure peaks and pressure gradients at the multiple positions and at the inlet duct outlet;

[0011] Determine the optimized arc segment parameterized model by using a global optimization algorithm, taking the minimum function value of the objective function as the optimization goal, wherein the objective function is a function of the maximum pressure peaks and the maximum pressure gradients at the multiple positions and at the inlet duct outlet, and the degree of change of the coordinate values ​​at the multiple positions before and after the optimization;

[0012] If the boundary layer thickness of the optimized inlet duct model is smaller than that of the optimized inlet duct model, and there is no flow separation phenomenon, the three-dimensional inlet duct model determined based on the optimized inlet duct model will be determined as the target three-dimensional inlet duct matching the compressor test bench, wherein the optimized inlet duct is established based on the optimized arc segment parameterized model, and the optimized inlet duct is established based on the arc segment parameterized model before optimization.

[0013] According to another aspect of the present disclosure, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the above-mentioned intake duct design method.

[0014] According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned intake duct design method is implemented.

[0015] According to the air inlet and the air inlet design method, equipment and medium of the embodiments of the present disclosure, the static incoming flow is sucked into the straight pipe section through the arc section connected to the straight pipe section, so that in an experimental environment, the oblique cut air inlet can provide the compressor test bench with an airflow with the same fluid characteristics as under actual flight conditions, thereby improving the accuracy and reliability of the research results of the influence of the determined air inlet on the operating characteristics of the compressor.

[0016] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other purposes, features and advantages of the present disclosure will become more apparent by describing the embodiments of the present disclosure in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1 It is a schematic diagram of the structure of an air intake duct according to an embodiment of the present disclosure.

[0019] Figure 2 is a flow chart illustrating an air intake duct design method according to a disclosed embodiment.

[0020] Figure 3 1 is a cross-sectional view of an air intake duct along the axial direction according to an embodiment of the present disclosure.

[0021] Figure 4 is a block diagram illustrating an air intake duct design apparatus according to an embodiment of the present disclosure.

[0022] Figure 5 is a schematic diagram illustrating a computer program product according to an embodiment of the present disclosure.

[0023] Figure 6 is a hardware block diagram illustrating an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present disclosure more obvious, the exemplary embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the exemplary embodiments described here.

[0025] In the related art, in an experimental environment, when studying the influence of the inlet on the operating characteristics of the compressor through an inlet and a compressor test bench, an inlet with the same geometric structure as that under actual flight conditions is usually used. The incoming flow under actual flight conditions is a dynamic inflow, which can directly provide gas to the compressor.

[0026] However, the inlet flow in the experimental environment is static flow. During the experiment, after the gas is directly provided to the compressor through the inlet, it is impossible to provide the compressor with an environment with the same characteristics as under actual flight conditions (i.e., the airflow environment under the condition of inlet static pressure distortion), resulting in inaccurate research results.

[0027] In order to solve the above problems, the present disclosure provides an air intake duct, such as Figure 1 As shown, the air intake duct includes:

[0028] A straight pipe segment 101, and an arc segment 102 connected to the first end of the straight pipe segment 101, wherein the arc center of the arc segment is located on a side away from the first surface a of the arc segment, and the plane where multiple target points on the second surface b of the arc segment are located has a preset angle with the radial surface of the straight pipe segment, wherein the multiple target points are multiple points farthest from the second end of the straight pipe segment in the circumferential direction, the first surface of the arc segment is an extension surface of the outer wall surface of the straight pipe segment on the arc segment, and the second surface of the arc segment is an extension surface of the inner wall surface of the straight pipe segment on the arc segment.

[0029] In summary, the air inlet provided in the embodiment of the present disclosure sucks the static incoming flow into the straight pipe section through the arc section connected to the straight pipe section, so that in an experimental environment, the oblique cut air inlet can provide the compressor test bench with an airflow with the same fluid properties as under actual flight conditions, thereby improving the accuracy and reliability of the research results of the influence of the determined air inlet on the operating characteristics of the compressor.

[0030] The embodiment of the present disclosure provides an air intake duct design method, which can be applied to a terminal device of a resource service provider, and the terminal device can be a computer, a notebook, a tablet computer or a server, such as Figure 2 As shown, Figure 2 A flow chart of an air intake duct design method provided by an embodiment of the present disclosure is shown, including:

[0031] Step S201, establishing an original three-dimensional model of the arc segment of the air inlet duct, and processing the coordinate values ​​of the arc segment in the original three-dimensional model based on an interpolation algorithm to obtain a parameterized model of the arc segment;

[0032] Step S202, based on the coordinate values ​​of the arc segment at multiple positions in the arc segment parameterized model and the flow rate of the compressor test bench, determine the pressure peaks and pressure gradients at multiple positions and at the inlet duct outlet;

[0033] Step S203, determining an optimized arc segment parameterized model by using a global optimization algorithm with the function value of the objective function being minimized as the optimization goal;

[0034] The objective function is a function of the maximum pressure peak and the maximum pressure gradient at multiple positions and at the inlet port outlet, as well as the degree of change of the coordinate values ​​at multiple positions before and after optimization.

[0035] Step S204: if the boundary layer thickness of the optimized intake duct model is smaller than that of the optimized intake duct model, and there is no flow separation phenomenon, the three-dimensional intake duct model determined based on the optimized intake duct model is determined as the target three-dimensional intake duct matching the compressor test bench;

[0036] The optimized air intake duct is established based on the optimized arc segment parameterized model, and the optimized air intake duct is established based on the optimized arc segment parameterized model.

[0037] In summary, the inlet duct design method provided in the embodiment of the present disclosure, on the one hand, determines the pressure peak and pressure gradient at the inlet duct outlet in combination with the flow parameters of the test bench, and optimizes the geometric structure of the arc section of the inlet duct by constructing the objective function of the two flow field parameters of the pressure peak and the pressure gradient, thereby improving the matching degree between the designed inlet duct and the compressor test bench, and improving the accuracy of the compressor characteristic research results determined based on the designed inlet duct and the compressor test bench; on the other hand, the shape of the arc section of the inlet duct is optimized through the global optimization algorithm, without consuming a large amount of computing resources, thereby improving the design efficiency of the inlet duct.

[0038] The following Figure 2 The specific implementation methods of each step in the embodiment shown are described in detail:

[0039] In step S201, the terminal device establishes an original three-dimensional model of the arc segment of the air inlet duct, and processes the coordinate values ​​of the arc segment in the original three-dimensional model based on an interpolation algorithm to obtain a parameterized model of the arc segment.

[0040] In the embodiment of the present disclosure, the type of interpolation algorithm used in the design process of the air intake duct can be determined based on actual needs, and the embodiment of the present disclosure does not limit this.

[0041] In an optional embodiment, the process of the terminal device establishing the original three-dimensional model of the arc segment of the air inlet duct includes: fitting the two-dimensional arc lines of the first part of the arc segment along the radial direction at multiple initial positions in the circumferential direction by double twist lines in combination with a pre-set preset angle to obtain the initial two-dimensional model of the first part of the arc segment, and fitting the two-dimensional arc lines of the second part of the arc segment along the radial direction at multiple initial positions in the circumferential direction by double twist lines to obtain the initial two-dimensional model of the second part of the arc segment; then, lofting the initial two-dimensional models of the first part of the arc segment and the second part of the arc segment to obtain the original three-dimensional model of the arc segment of the air inlet duct, wherein in the original three-dimensional model, the distance between the target point on the second surface of the first part of the arc segment and the second end of the straight pipe section of the air inlet duct is greater than the distance between the target point on the second surface of the second part of the arc segment and the second end of the straight pipe section of the air inlet duct. The cross-sectional view of the air inlet duct along the axial direction is as shown in FIG. Figure 3 As shown, Figure 3 1021 is the cross-sectional area of ​​the first arc segment, and 1022 is the cross-sectional area of ​​the second arc segment. The original three-dimensional model of the arc segment of the air intake duct can be constructed by combining the preset angle of the bevel cut in the bevel cut air intake duct required in the experimental scenario, so that the designed air intake duct meets the actual needs of the experimental scenario.

[0042] It can be understood that the specific value of the preset angle can be determined based on actual needs, and the embodiments of the present disclosure are not limited to this. For example, the preset angle θ∈[-45°, 15°].

[0043] Among them, the double twisted line is a double twisted line in polar coordinate form, and the double twisted line formula in polar coordinate form is:

[0044] r 2 =a 2 cos2θ; (Formula 1)

[0045] In Formula 1, a is a parameter for controlling the length of the twisted pair, and can be specifically determined based on actual needs.

[0046] It should be noted that, in the embodiment of the present disclosure, since it is necessary to design an oblique inlet duct with the end of the arc segment on the side of the outer wall of the straight pipe segment, in the process of fitting the two-dimensional arc lines along the radial direction at multiple initial positions of the first part of the arc segment at the circumferential direction through a double twist line to obtain the initial two-dimensional model of the first part of the arc segment, the double twist line needs to be rotated 45 degrees counterclockwise; similarly, in order to fit the two-dimensional arc lines along the radial direction at multiple initial positions of the second part of the arc segment at the circumferential direction through a double twist line to obtain the initial two-dimensional model of the second part of the arc segment, the double twist line needs to be rotated 45 degrees clockwise.

[0047] In an optional embodiment, since the wall thickness of the straight pipe section is known, the shape of the entire arc segment can be directly determined after determining the geometric shape of one side of the arc segment connected to the inner wall of the straight pipe section, and the terminal device processes the coordinate value of the arc segment in the original three-dimensional model based on the interpolation algorithm to obtain the arc segment parameterized model. The process includes: interpolating the arc coordinate value of the radial part of the second surface of the arc segment in the original three-dimensional model based on the interpolation algorithm to obtain the arc segment parameterized model. The arc segment parameterized model can be constructed by the coordinates of the radial part of the arc of one side of the arc segment connected to the inner wall of the straight pipe section, which reduces the amount of data processing in the design process of the bevel inlet duct and improves the design efficiency.

[0048] For example, the interpolation algorithm may be the carmull_rom spline interpolation algorithm, and the spline interpolation algorithm may be:

[0049]

[0050] In Formula 2, t is a position parameter, α is a parameter for adjusting the degree of distortion of the Carmull-Rom curve, which can be determined based on actual needs. The embodiments of the present disclosure are not limited to this. For example, α can be 0.5, P is a position coordinate value, and r is an interpolation round.

[0051] In step S202, the terminal device determines the pressure peaks and pressure gradients at multiple positions and at the inlet outlet based on the coordinate values ​​of the arc segment at multiple positions in the arc segment parameterized model and the flow rate of the compressor test bench.

[0052] In the disclosed embodiment, the flow rate of the compressor test bench is equal to the inlet outlet flow rate, and the pressure peak and pressure gradient are flow field parameters.

[0053] In an optional embodiment, the process of determining the pressure peaks and pressure gradients at multiple positions and at the inlet outlet by the terminal device based on the coordinate values ​​of the arc segment at multiple positions in the arc segment parameterized model and the flow rate of the compressor test bench may include: constructing a first fluid equation for the arc segment in the inlet model corresponding to the arc segment parameterized model based on the panel method, and constructing a second fluid equation at the inlet outlet in the inlet model based on the panel method; then, solving the equation group consisting of the first fluid equation and the second fluid equation in combination with the coordinate values ​​of the arc segment at multiple positions in the arc segment parameterized model and the flow rate of the compressor test bench to obtain the dipole strengths at multiple positions and at the inlet outlet; further, solving the model based on the dipole strengths at multiple positions and at the inlet outlet and the pressure peak and pressure gradient to obtain the pressure peaks and pressure gradients at multiple positions and at the inlet outlet. The flow parameters of the compressor test bench under the experimental environment can be combined to determine the flow field parameters of the inlet duct under the test scenario, so as to design an oblique cut inlet duct with geometric characteristics that better meet the requirements of the experimental scenario based on the flow field parameters of the inlet duct under the test scenario.

[0054] Among them, the first fluid equation is:

[0055]

[0056] In formula 3, B i , C i is the coefficient at the i-th position among multiple positions, which can be determined based on actual conditions, μ i is the dipole strength at the ith position, and the source strength at the ith position is σ i =n i Q ∞ , where n i is the normal direction vector at the i-th position, Q ∞ is the flow value at infinity, and N is the total number of multiple locations.

[0057] The second fluid equation is:

[0058] B out σ out +C out μ out =0; (Formula 4)

[0059] In formula 4, B out , C out is the coefficient at the inlet duct outlet, which can be determined based on actual conditions, μ out is the dipole strength at the inlet exit, and the source strength at the inlet exit is σ out =n out Q ∞ -V out , where n out is the normal direction vector at the inlet outlet, V out is the inlet duct outlet flow rate. It can be understood that the inlet duct outlet flow rate is the flow rate of the compressor test bench.

[0060] The process of obtaining the pressure peaks and pressure gradients at multiple positions and the inlet duct outlet based on the dipole strengths at multiple positions and the inlet duct outlet and the pressure peak and pressure gradient solution model of the terminal device includes: inputting the dipole strengths and coordinate values ​​at multiple positions and the inlet duct outlet into the pressure peak and pressure gradient solution model to obtain the pressure peaks and pressure gradients at multiple positions and the inlet duct outlet. Based on the pressure peak and pressure gradient solution model, the pressure peaks and pressure gradients at multiple positions and the inlet duct outlet can be quickly determined, further improving the design efficiency of the bevel inlet duct.

[0061] Among them, the pressure peak and pressure gradient solution model is:

[0062]

[0063] In Formula 5, x and z are coordinate values, μ is the dipole strength, aoa is the intake angle of attack, which can be determined based on actual needs. The embodiments of the present disclosure do not limit this. For example, aoa can be 0, P0 is atmospheric pressure, ρ is air density, i is the i-th position among multiple positions and the intake duct outlet, P is the peak pressure, PPG is the positive pressure gradient, and APG is the adverse pressure gradient.

[0064] In step S203, the terminal device determines the optimized arc segment parameterized model through a global optimization algorithm with the minimum function value of the objective function as the optimization goal.

[0065] In the embodiment of the present disclosure, the objective function is a function of the maximum pressure peak and the maximum pressure gradient at multiple positions and at the inlet port outlet, and the degree of change of the coordinate values ​​at the multiple positions before and after optimization.

[0066] In an optional embodiment, the terminal device constructs an objective function based on the degree of change of the coordinate values ​​at multiple positions before and after optimization, the maximum pressure peak and maximum pressure gradient of the first arc segment at multiple positions and at the inlet duct outlet, and the maximum pressure peak and maximum pressure gradient of the second arc segment at multiple positions and at the inlet duct outlet. The objective function can be constructed based on the flow field parameters at the first arc segment and the flow field parameters at the second arc segment in the bevel cut inlet duct arc segment to further improve the accuracy of the arc segment geometry determined during the arc segment geometry optimization process.

[0067] Among them, the objective function is:

[0068]

[0069] In Formula 6, W is the weight, SF is the degree of change of the coordinate values ​​at multiple positions before and after optimization, and Fcn1 = max(|P| upper ), Fcn1 is the maximum pressure peak value of the first arc segment at multiple positions and at the inlet outlet, Fcn2 = max(|PPG| upper ), Fcn2 is the maximum positive pressure gradient of the first arc segment at multiple positions and at the inlet outlet, Fcn3 = max(|APG| upper ), Fcn3 is the maximum adverse pressure gradient of the first arc segment at multiple positions and at the inlet outlet, Fcn4 = max(|P| lower ), Fcn4 is the maximum pressure peak value of the second arc segment at multiple positions and at the inlet outlet, Fcn5 = max(|PPG| lower ), Fcn5 is the maximum positive pressure gradient of the second arc segment at multiple positions and at the inlet outlet, Fcn6 = max(|APG| lower ), Fcn6 is the maximum adverse pressure gradient of the second arc segment at multiple positions and at the inlet outlet.

[0070] It should be noted that, in the embodiment of the present disclosure, the change degree SF of the coordinate values ​​at multiple positions before and after optimization is:

[0071]

[0072] In Formula 7, P opt and P origin are the coordinate values ​​before and after optimization at each position, ΔP range is the coordinate change threshold, wherein the coordinate change threshold on the x-axis is Δx=±1 mm, and the coordinate change threshold on the y-axis is Δy=±1.

[0073] Among them, the weight of the maximum peak value of the first arc segment, the weight of the maximum positive pressure gradient, and the weight of the maximum adverse pressure gradient can be determined based on actual needs, and the embodiments of the present disclosure do not limit this. At the same time, since it is found in the actual design process that the first arc segment is more prone to flow separation, the optimization weight of the lower lip portion is strengthened, and the weight of the maximum peak value of the second arc segment is a preset multiple of the weight of the maximum peak value of the first arc segment. Similarly, the weight of the maximum positive pressure gradient of the second arc segment is a preset multiple of the weight of the maximum positive pressure gradient of the first arc segment, and the weight of the maximum adverse pressure gradient of the second arc segment is a preset multiple of the weight of the maximum adverse pressure gradient of the first arc segment. Specifically, it can be determined based on actual needs, and the embodiments of the present disclosure do not limit this. For example, W upper :W lower =1:4.

[0074] In an optional implementation, the terminal device uses a global optimization algorithm to minimize the function value of the objective function as the optimization goal. In the process of determining the optimized arc segment parameterized model, the global optimization algorithm used may be a particle swarm algorithm and a genetic algorithm, which can improve iteration efficiency.

[0075] In step S204, if the boundary layer thickness of the optimized intake duct model is smaller than that of the optimized intake duct model and there is no flow separation phenomenon, the terminal device will determine the three-dimensional intake duct model determined based on the optimized intake duct model as the target three-dimensional intake duct that matches the compressor test bench.

[0076] In the embodiment of the present disclosure, the optimized air intake duct is established based on the optimized arc segment parameterized model, and the optimized air intake duct is established based on the optimized arc segment parameterized model.

[0077] The terminal device may determine, based on a computational fluid dynamics (CFD) method, whether the boundary layer thickness of the intake duct model after optimization is smaller than that of the intake duct model before optimization, and whether there is no flow separation phenomenon.

[0078] In an optional embodiment, if the boundary layer thickness of the optimized air intake duct model is thicker than that of the optimized air intake duct model, or there is flow separation, the iterative optimization of the arc segment parameterized model is repeated by updating the weight of the objective function, increasing the coordinate change threshold related to the second part of the arc segment, or the parameters of the global optimization algorithm, until it is determined that the boundary layer thickness of the optimized air intake duct model is thinner than that of the optimized air intake duct model, and there is no flow separation.

[0079] In an optional embodiment, if the boundary layer thickness of the optimized inlet duct model is smaller than that of the optimized inlet duct model, and there is no flow separation phenomenon, the terminal device will determine the three-dimensional inlet duct model based on the optimized inlet duct model as the target three-dimensional inlet duct that matches the compressor test bench, wherein the process by which the terminal device determines the three-dimensional inlet duct model based on the optimized inlet duct model can be implemented based on the lofting method.

[0080] In an optional embodiment, after determining the three-dimensional inlet duct model determined based on the optimized inlet duct model as the target three-dimensional inlet duct matching the compressor test bench, the terminal device can also: in response to obtaining the secondary modeling instruction, in combination with the pre-set preset angle, fit the radial two-dimensional arc lines of the first part of the arc segment at multiple updated positions in the circumferential direction through double twist lines to obtain an updated two-dimensional model of the first part of the arc segment, and fit the radial two-dimensional arc lines of the second part of the arc segment at multiple updated positions in the circumferential direction through double twist lines to obtain an updated two-dimensional model of the second part of the arc segment, wherein the number of multiple updated positions is greater than the number of multiple initial positions; then, perform lofting processing on the updated two-dimensional models of the first part of the arc segment and the second part of the arc segment to obtain an updated three-dimensional model of the inlet duct arc segment; further, based on the updated three-dimensional model of the inlet duct arc segment, determine the updated target three-dimensional inlet duct matching the compressor test bench. When the modeling effect is not ideal, the air intake duct can be redesigned through coordinate information of more positions to improve the matching degree between the designed oblique cut air intake duct and the actual needs.

[0081] It can be understood that the process by which the terminal device determines the updated target three-dimensional air inlet duct that matches the compressor test bench based on the updated three-dimensional model of the arc segment of the air inlet duct can refer to the process in which the terminal device determines the target three-dimensional air inlet duct that matches the compressor test bench based on the original three-dimensional model of the arc segment of the air inlet duct in the above embodiment, and the present disclosed embodiment will not elaborate on this.

[0082] An exemplary embodiment of the present disclosure provides an air intake duct design device, which may be a server or a chip applied to a server. Figure 4 FIG. 1 shows a schematic block diagram of functional modules of an air intake design device according to an exemplary embodiment of the present disclosure. Figure 4 As shown, the air inlet design device 400 includes:

[0083] The model building module 401 is configured to build an original three-dimensional model of the arc segment of the air inlet duct, and process the coordinate values ​​of the arc segment in the original three-dimensional model based on an interpolation algorithm to obtain a parameterized model of the arc segment;

[0084] A determination module 402 is configured to determine the pressure peaks and pressure gradients at the multiple positions and at the inlet port outlet based on the coordinate values ​​of the arc segment at the multiple positions in the arc segment parameterized model and the flow rate of the compressor test bench;

[0085] The optimization module 403 is configured to determine the optimized arc segment parameterized model by using a global optimization algorithm with the function value of the objective function being minimized as the optimization target, wherein the objective function is a function of the maximum pressure peaks and the maximum pressure gradients at the multiple positions and at the inlet duct outlet, and the degree of change of the coordinate values ​​at the multiple positions before and after the optimization;

[0086] The model establishment module 404 is configured to determine the three-dimensional inlet duct model determined based on the optimized inlet duct model as the target three-dimensional inlet duct matching the compressor test bench if the boundary layer thickness of the inlet duct model after optimization is smaller than that of the inlet duct model before optimization and there is no flow separation phenomenon, wherein the inlet duct after optimization is established based on the parameterized model of the arc segment after optimization, and the inlet duct before optimization is established based on the parameterized model of the arc segment before optimization.

[0087] Optionally, the model building module 401 is configured to:

[0088] In combination with the preset angle, the two-dimensional arc lines of the first arc segment along the radial direction at multiple initial positions in the circumferential direction are fitted by a double twist line to obtain an initial two-dimensional model of the first arc segment, and the two-dimensional arc lines of the second arc segment along the radial direction at multiple initial positions in the circumferential direction are fitted by a double twist line to obtain an initial two-dimensional model of the second arc segment;

[0089] The initial two-dimensional models of the first partial arc segment and the second partial arc segment are lofted to obtain an original three-dimensional model of the air inlet arc segment, wherein, in the original three-dimensional model, the distance between the target point on the second surface of the first partial arc segment and the second end of the air inlet straight pipe segment is greater than the distance between the target point on the second surface of the second partial arc segment and the second end of the air inlet straight pipe segment.

[0090] Optionally, the device further includes an updating module 405 configured to:

[0091] In response to obtaining the secondary modeling instruction, in combination with the preset angle, a two-dimensional arc line along the radial direction at a plurality of updated positions of the first partial arc segment in the circumferential direction is fitted by a double twist line to obtain an updated two-dimensional model of the first partial arc segment, and a two-dimensional arc line along the radial direction at a plurality of updated positions of the second partial arc segment is fitted by a double twist line to obtain an updated two-dimensional model of the second partial arc segment, wherein the number of the plurality of updated positions is greater than the number of the plurality of initial positions;

[0092] Performing lofting processing on the updated two-dimensional models of the first partial arc segment and the second partial arc segment to obtain an updated three-dimensional model of the air inlet arc segment;

[0093] Based on the updated three-dimensional model of the arc segment of the air inlet duct, an updated target three-dimensional air inlet duct matching the compressor test bench is determined.

[0094] Optionally, the apparatus further includes a construction module 406 configured to:

[0095] Based on the change degree of the coordinate values ​​at the multiple positions before and after the optimization, the maximum pressure peaks and the maximum pressure gradient of the first arc segment at the multiple positions and at the inlet duct outlet, and the maximum pressure peaks and the maximum pressure gradient of the second arc segment at the multiple positions and at the inlet duct outlet, the objective function is constructed, wherein the objective function is:

[0096]

[0097] Where W is the weight, SF is the change degree of the coordinate values ​​at multiple positions before and after optimization, Fcn1=max(|P| upper ), Fcn1 is the maximum pressure peak of the first arc segment at the plurality of positions and at the inlet duct outlet, Fcn2=max(|PPG| upper ), Fcn2 is the maximum positive pressure gradient of the first arc segment at the plurality of positions and at the inlet duct outlet, Fcn3 = max(|APG| upper ), Fcn3 is the maximum adverse pressure gradient of the first arc segment at the plurality of positions and at the inlet duct outlet, Fcn4=max(|P| lower ), Fcn4 is the maximum pressure peak of the second arc segment at the plurality of positions and at the inlet duct outlet, Fcn5=max(|PPG| lower ), Fcn5 is the maximum positive pressure gradient of the second arc segment at the plurality of positions and at the inlet duct outlet, Fcn6 = max(|APG| lower ), Fcn6 is the maximum adverse pressure gradient of the second partial arc segment at the multiple positions and at the inlet outlet.

[0098] Optionally, the determining module 402 is configured to:

[0099] Constructing a first fluid equation of the arc segment in the air intake model corresponding to the arc segment parameterized model based on the panel method, and constructing a second fluid equation at the air intake outlet in the air intake model based on the panel method;

[0100] In combination with the coordinate values ​​of the arc segment at multiple positions in the arc segment parameterized model and the flow rate of the compressor test bench, the equation group consisting of the first fluid equation and the second fluid equation is solved to obtain the dipole strengths at multiple positions and at the inlet duct outlet;

[0101] Based on the dipole strengths at the plurality of positions and at the inlet duct outlet, and the pressure peak and pressure gradient solving model, the pressure peak and pressure gradient at the plurality of positions and at the inlet duct outlet are obtained.

[0102] Optionally, the determining module 402 is configured to:

[0103] The dipole strengths and coordinate values ​​at the multiple positions and the inlet duct outlet are input into the pressure peak and pressure gradient solution model to obtain the pressure peak and pressure gradient at the multiple positions and the inlet duct outlet, wherein the pressure peak and pressure gradient solution model is:

[0104]

[0105] Where x and z are coordinate values, μ is the dipole strength, V out is the inlet duct outlet flow rate, the inlet duct outlet flow rate is the flow rate of the compressor test bench, aoa is the inlet attack angle, P0 is the atmospheric pressure, ρ is the air density, and i is the i-th position among multiple positions and the inlet duct outlet.

[0106] Optionally, the model building module 401 is configured to:

[0107] Based on the interpolation algorithm, the arc coordinate values ​​of the upper part of the second surface of the arc segment in the original three-dimensional model along the radial direction are interpolated to obtain a parameterized model of the arc segment.

[0108] The exemplary embodiment of the present disclosure also provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor in communication. The memory stores a computer program that can be executed by the at least one processor, and the computer program is used to cause the electronic device to perform the method according to the embodiment of the present disclosure when executed by the at least one processor.

[0109] The exemplary embodiments of the present disclosure also provide a non-transitory computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to perform the method according to the embodiments of the present disclosure.

[0110] like Figure 5As shown, the exemplary embodiment of the present disclosure further provides a computer program product 500, including a computer program 501, wherein when the computer program is executed by a processor of a computer, it is used to enable the computer to perform the method according to the embodiment of the present disclosure.

[0111] refer to Figure 6 , a block diagram of an electronic device 600 that can be used as a terminal device of the present disclosure will now be described, which is an example of a hardware device that can be applied to various aspects of the present disclosure. The electronic device is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples, and are not intended to limit the implementation of the present disclosure described and / or required herein.

[0112] like Figure 6 As shown, the electronic device 600 includes a computing unit 601, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 602 or a computer program loaded from a storage unit 608 into a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the electronic device 600 can also be stored. The computing unit 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0113] A plurality of components in the electronic device 600 are connected to the I / O interface 605, including: an input unit 606, an output unit 607, a storage unit 608, and a communication unit 609. The input unit 606 may be any type of device capable of inputting information to the electronic device 600, and the input unit 606 may receive input digital or character information, and generate key signal inputs related to user settings and / or function control of the electronic device. The output unit 607 may be any type of device capable of presenting information, and may include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 608 may include, but is not limited to, a disk, an optical disk. The communication unit 609 allows the electronic device 600 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and may include, but is not limited to, a modem, a network card, an infrared communication device, a wireless communication transceiver, and / or a chipset, such as a Bluetooth™ device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0114] The computing unit 601 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 601 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 601 performs the various methods and processes described above. For example, in some embodiments, the method of the exemplary embodiment of the present disclosure may be implemented as a computer software program, which is tangibly included in a machine-readable medium, such as a storage unit 608. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 600 via the ROM 602 and / or the communication unit 609. In some embodiments, the computing unit 601 may be configured to perform the method of the exemplary embodiment of the present disclosure by any other appropriate means (e.g., by means of firmware).

[0115] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0116] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0117] As used in this disclosure, the terms "machine-readable medium" and "computer-readable medium" refer to any computer program product, apparatus, and / or device (e.g., disk, optical disk, memory, programmable logic device (PLD)) for providing machine instructions and / or data to a programmable processor, including a machine-readable medium that receives machine instructions as a machine-readable signal. The term "machine-readable signal" refers to any signal for providing machine instructions and / or data to a programmable processor.

[0118] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0119] The systems and techniques described herein may be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), and the Internet.

[0120] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present disclosure is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a terminal, a user device or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, for example, a floppy disk, a hard disk, a tape; it may also be an optical medium, for example, a digital video disc (DVD); it may also be a semiconductor medium, for example, a solid state drive (SSD).

[0121] Although the present disclosure has been described in conjunction with specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present disclosure. Accordingly, this specification and the drawings are merely exemplary illustrations of the present disclosure as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present disclosure. Obviously, those skilled in the art may make various modifications and variations to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

Claims

1. An air intake duct, characterized in that: include: A straight pipe segment, and an arc segment connected to the first end of the straight pipe segment, wherein the arc center of the arc segment is located on a side away from the first surface of the arc segment, and the plane where multiple target points on the second surface of the arc segment are located has a preset angle with the radial surface of the straight pipe segment, wherein the multiple target points are multiple points farthest from the second end of the straight pipe segment in the circumferential direction, the first surface of the arc segment is an extension surface of the outer wall surface of the straight pipe segment on the arc segment, and the second surface of the arc segment is an extension surface of the inner wall surface of the straight pipe segment on the arc segment.

2. An air intake duct design method, characterized in that: include: Establishing an original three-dimensional model of the arc segment of the air inlet duct, and processing the coordinate values ​​of the arc segment in the original three-dimensional model based on an interpolation algorithm to obtain a parameterized model of the arc segment; Based on the coordinate values ​​of the arc segment at multiple positions in the arc segment parameterized model and the flow rate of the compressor test bench, determine the pressure peaks and pressure gradients at the multiple positions and at the inlet duct outlet; Determine the optimized arc segment parameterized model by using a global optimization algorithm, taking the minimum function value of the objective function as the optimization goal, wherein the objective function is a function of the maximum pressure peaks and the maximum pressure gradients at the multiple positions and at the inlet duct outlet, and the degree of change of the coordinate values ​​at the multiple positions before and after the optimization; If the boundary layer thickness of the optimized inlet duct model is smaller than that of the optimized inlet duct model, and there is no flow separation phenomenon, the three-dimensional inlet duct model determined based on the optimized inlet duct model will be determined as the target three-dimensional inlet duct matching the compressor test bench, wherein the optimized inlet duct is established based on the optimized arc segment parameterized model, and the optimized inlet duct is established based on the arc segment parameterized model before optimization.

3. The air intake duct design method according to claim 2, characterized in that: The method of establishing the original three-dimensional model of the air inlet arc section includes: In combination with the preset angle, the two-dimensional arc lines of the first arc segment along the radial direction at multiple initial positions in the circumferential direction are fitted by a double twist line to obtain an initial two-dimensional model of the first arc segment, and the two-dimensional arc lines of the second arc segment along the radial direction at multiple initial positions in the circumferential direction are fitted by a double twist line to obtain an initial two-dimensional model of the second arc segment; The initial two-dimensional models of the first partial arc segment and the second partial arc segment are lofted to obtain an original three-dimensional model of the air inlet arc segment, wherein, in the original three-dimensional model, the distance between the target point on the second surface of the first partial arc segment and the second end of the air inlet straight pipe segment is greater than the distance between the target point on the second surface of the second partial arc segment and the second end of the air inlet straight pipe segment.

4. The air intake duct design method according to claim 3, characterized in that: After determining the three-dimensional air intake model determined based on the optimized air intake model as a target three-dimensional air intake matched with the compressor test bench, the method further includes: In response to obtaining the secondary modeling instruction, in combination with the preset angle, a two-dimensional arc line along the radial direction at a plurality of updated positions of the first partial arc segment in the circumferential direction is fitted by a double twist line to obtain an updated two-dimensional model of the first partial arc segment, and a two-dimensional arc line along the radial direction at a plurality of updated positions of the second partial arc segment is fitted by a double twist line to obtain an updated two-dimensional model of the second partial arc segment, wherein the number of the plurality of updated positions is greater than the number of the plurality of initial positions; Performing lofting processing on the updated two-dimensional models of the first partial arc segment and the second partial arc segment to obtain an updated three-dimensional model of the air inlet arc segment; Based on the updated three-dimensional model of the arc segment of the air inlet duct, an updated target three-dimensional air inlet duct matching the compressor test bench is determined.

5. The air intake duct design method according to claim 3, characterized in that: The method further comprises: Based on the change degree of the coordinate values ​​at the multiple positions before and after the optimization, the maximum pressure peaks and the maximum pressure gradient of the first arc segment at the multiple positions and at the inlet duct outlet, and the maximum pressure peaks and the maximum pressure gradient of the second arc segment at the multiple positions and at the inlet duct outlet, the objective function is constructed, wherein the objective function is: Where W is the weight, SF is the change degree of the coordinate values ​​at multiple positions before and after optimization, Fcn1=max(|P| upper ), Fcn1 is the maximum pressure peak of the first arc segment at the plurality of positions and at the inlet duct outlet, Fcn2=max(|PPG| upper ), Fcn2 is the maximum positive pressure gradient of the first arc segment at the plurality of positions and at the inlet duct outlet, Fcn3 = max(|APG| upper ), Fcn3 is the maximum adverse pressure gradient of the first arc segment at the plurality of positions and at the inlet duct outlet, Fcn4=max(|P| lower ), Fcn4 is the maximum pressure peak of the second arc segment at the plurality of positions and at the inlet duct outlet, Fcn5=max(PPG lower ), Fcn5 is the maximum positive pressure gradient of the second arc segment at the plurality of positions and at the inlet outlet, Fcn6=max(APG lower ), Fcn6 is the maximum adverse pressure gradient of the second partial arc segment at the multiple positions and at the inlet outlet.

6. The air intake duct design method according to claim 2, characterized in that: The method of determining the pressure peaks and pressure gradients at the multiple positions and at the inlet duct outlet based on the coordinate values ​​of the arc segment at the multiple positions in the arc segment parameterized model and the flow rate of the compressor test bench comprises: Constructing a first fluid equation of the arc segment in the air intake model corresponding to the arc segment parameterized model based on the panel method, and constructing a second fluid equation at the air intake outlet in the air intake model based on the panel method; In combination with the coordinate values ​​of the arc segment at multiple positions in the arc segment parameterized model and the flow rate of the compressor test bench, the equation group consisting of the first fluid equation and the second fluid equation is solved to obtain the dipole strengths at multiple positions and at the inlet duct outlet; Based on the dipole strengths at the plurality of positions and at the inlet duct outlet, and the pressure peak and pressure gradient solving model, the pressure peak and pressure gradient at the plurality of positions and at the inlet duct outlet are obtained.

7. The air intake duct design method according to claim 6, characterized in that: The method of obtaining the pressure peaks and pressure gradients at the plurality of positions and at the inlet duct outlet based on the dipole strengths at the plurality of positions and at the inlet duct outlet, and the pressure peak and pressure gradient solving model, comprises: The dipole strengths and coordinate values ​​at the multiple positions and the inlet duct outlet are input into the pressure peak and pressure gradient solution model to obtain the pressure peak and pressure gradient at the multiple positions and the inlet duct outlet, wherein the pressure peak and pressure gradient solution model is: Where x and z are coordinate values, μ is the dipole strength, V out is the inlet duct outlet flow rate, the inlet duct outlet flow rate is the flow rate of the compressor test bench, aoa is the inlet attack angle, P0 is the atmospheric pressure, ρ is the air density, and i is the i-th position among multiple positions and the inlet duct outlet.

8. The air intake duct design method according to claim 2, characterized in that: The method of processing the coordinate values ​​of the arc segments in the original three-dimensional model based on the interpolation algorithm to obtain the arc segment parameterized model includes: Based on the interpolation algorithm, the arc coordinate values ​​of the upper part of the second surface of the arc segment in the original three-dimensional model along the radial direction are interpolated to obtain a parameterized model of the arc segment.

9. An electronic device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the air intake duct design method described in any one of claims 2-8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the air intake duct design method described in any one of claims 2 to 8 is implemented.

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