Impeller blade leading edge design method and device, oblique flow impeller, equipment and medium

Abstract

The invention relates to the technical field of gas compressors, and discloses a blade front edge design method and device of an impeller, an oblique flow impeller, equipment and a medium, and according to the blade height of a connecting point between a root sweepback molded line and a tip sweepforward molded line, the numerical interval of the blade height is divided into a first interval and a second interval. A target root sweepback molded line is constructed by determining the sweepback amount corresponding to each first height in the first interval, and the root area of the blade is sweepback, so that the strength of the blade is improved, and the vibration problem of the blade is solved. And the sweepback amount corresponding to each second height in the second interval is determined to construct a target tip sweepforward molded line, so that the impeller tip adapts to better ultrasonic incoming flow. By the adoption of the structure that the roots of the blades sweep backwards and the tips of the blades sweep forwards, the performance of the oblique flow compressor is improved.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a method and device for designing the leading edge of an impeller blade, an inclined flow impeller, equipment and a medium. Background Art

[0002] The cross-flow compressor has the advantages of high pressure ratio and wide working range of centrifugal compressors and large flow and high efficiency of axial flow compressors, especially at high specific speeds, it shows relatively superior performance. With the development of high-performance turboshaft engines, the research on cross-flow compressors has become a new hotspot in recent years. In order to meet the ever-increasing power-to-weight ratio design requirements of turboshaft engines, cross-flow compressors are developing in the direction of high pressure ratio and high load. High-pressure ratio cross-flow compressors usually have the characteristics of high blade tip Mach number (up to 1.45). In order to achieve high performance, how to effectively control the shock wave in the blade tip area is very critical. The forward-swept design can effectively organize the shock wave structure in the blade tip area and control flow losses, but the simple leading edge forward sweep will bring more serious problems such as blade strength.

[0003] Therefore, how to design the leading edge of the blade to improve the performance of the oblique flow impeller while avoiding problems such as blade strength has become a very critical issue. Summary of the invention

[0004] In view of this, the present application provides a method, device, diagonal flow impeller, equipment and medium for designing the leading edge of an impeller blade to solve the problem that the current impeller swept design easily affects the performance of the diagonal flow compressor.

[0005] In a first aspect, the present application provides a method for designing a leading edge of an impeller blade, wherein the root of the leading edge of the blade is swept back and the tip is swept forward, the method comprising:

[0006] Determine the numerical range of the blade height and the connection point height of the leading edge profile, the blade height is the height of any point on the leading edge profile projected relative to the forehead line, and the connection point height is the blade height corresponding to the connection point between the root swept back profile and the tip swept forward profile;

[0007] Based on the connection point height, the numerical interval of the blade height is divided into a first interval and a second interval;

[0008] Determine the swept amount corresponding to each first height in the first interval, and determine the swept amount corresponding to each second height in the second interval; wherein the swept amount is the distance of the first height or the second height relative to the root point of the blade in a direction perpendicular to the frontal line;

[0009] Based on the sweep amounts corresponding to each first height and each second height, a target root swept profile line and a target tip swept profile line are determined to obtain a target leading edge profile line of the blade.

[0010] Beneficial effects: The present application utilizes the blade height at the connection point between the root swept profile and the tip swept profile to divide the numerical range of the blade height into a first range and a second range. By determining the swept amount corresponding to each first height in the first range, a target root swept profile is constructed, and the root area of ​​the blade is swept back to increase the strength of the blade and improve the blade vibration problem. By determining the swept amount corresponding to each second height in the second range, a target tip swept profile is constructed to make the impeller tip adapt to better supersonic incoming flow. By adopting a structure in which the blade root is swept back and the tip is swept forward, the performance of the diagonal flow compressor is improved.

[0011] In an optional implementation, determining the sweep amount corresponding to each first height in the first interval, and determining the sweep amount corresponding to each second height in the second interval, includes:

[0012] Input each first height in the first interval into the first profile control function to obtain the sweep amount corresponding to each first height;

[0013] Input each second height in the second interval into the second profile control function to obtain the sweep amount corresponding to each second height; wherein, the function values ​​of the first profile control function and the second profile control function at the connection point height are equal, and the function values ​​of the first-order derivative of the first profile control function and the first-order derivative of the second profile control function at the connection point height are equal.

[0014] Beneficial effects: The present application determines the swept amount corresponding to each first height in the first interval and each second height in the second interval through the first profile control function and the second profile control function, and then determines the degree of swept back of the leading edge root and swept forward of the tip of the blade, thereby obtaining the leading edge profile of the blade. In addition, by ensuring that the first profile control function and the second profile control function, and the first-order derivative of the first profile control function and the first-order derivative of the second profile control function are continuous at the height of the connection point, the leading edge profile is ensured to have a smooth transition, reduce the stress on the leading edge of the blade, and reduce the vibration of the blade.

[0015] In an optional implementation, determining a target root swept profile based on the swept amount corresponding to each first height and each second height includes:

[0016] constructing a root swept profile line based on the swept amount corresponding to each first height, and determining a first swept angle between the root swept profile line and the frontal line;

[0017] According to the tip point height of the blade and the sweep amount corresponding to the tip point height, a second sweep angle between the first connecting line and the frontal line is obtained; wherein the tip point height is the blade height corresponding to the tip point of the blade, and the first connecting line is the connecting line between the tip point and the root point;

[0018] If it is detected that the first sweep angle, the second sweep angle, and the sweep amount corresponding to the connection point height meet the first preset constraint condition, the root swept profile line is used as the target root swept profile line.

[0019] Beneficial effect: The present application utilizes the sweep amount corresponding to each first height to construct the root swept profile line, and performs constraint verification on the first sweep angle between the root swept profile line and the frontal line, the second sweep angle between the line connecting the tip point and the root point and the frontal line, and the maximum sweep amount of the root swept profile line. If the verification passes, the root swept profile line is used as the target root swept profile line, and the sweep degree of the leading edge of the blade is then designed.

[0020] In an optional embodiment, the first preset constraint includes: the range of the first sweep angle is 0 to -30°, the range of the second sweep angle is 0 to -45°, and the sweep amount corresponding to the connection point height is not less than 0 and not greater than 0.25 times the length of the blade hub.

[0021] Beneficial effect: The present application ensures that the target root swept profile meets the performance and reliability requirements by performing constraint detection on the first sweep angle, the second sweep angle and the sweep amount corresponding to the connection point height.

[0022] In an optional embodiment, determining a target tip forward swept profile based on the sweep amounts corresponding to each first height and each second height includes:

[0023] constructing a tip forward sweep profile line based on the sweep amount corresponding to each second height, and determining a first forward sweep angle between the tip forward sweep profile line and the forehead line;

[0024] Determine a second forward sweep angle between the second connecting line and the forehead line according to the height of the connecting point and the sweep amount corresponding to the height of the connecting point, the height of the tip point and the sweep amount corresponding to the height of the tip point; wherein the second connecting line is the connecting line between the tip point and the connecting point;

[0025] If it is detected that the difference between the first sweep angle, the second sweep angle, and the sweep amount corresponding to the connection point height and the sweep amount corresponding to the tip point height meets the second preset constraint condition, the tip swept profile line is used as the target tip swept profile line.

[0026] Beneficial effect: The present application utilizes the sweep amount corresponding to each second height to construct the tip swept-forward profile line, and performs constraint verification on the first swept-forward angle between the tip swept-forward profile line and the frontal line, the second swept-forward angle between the line connecting the tip point and the connecting point and the frontal line, and the swept-back amount of the tip swept-forward profile line. If the verification passes, the tip swept-forward profile line is used as the target tip swept-forward profile line, and the swept degree of the leading edge of the blade is then designed.

[0027] In an optional embodiment, the second preset constraint includes: the range of the first sweep angle is 0 to 20°, the range of the second sweep angle is 0 to 30°, and the difference between the sweep amount corresponding to the connection point height and the sweep amount corresponding to the tip point height is not less than 0.05 times the span length of the blade and not greater than 0.25 times the span length of the blade.

[0028] Beneficial effect: The present application ensures that the swept-forward profile of the target tip meets the performance and reliability requirements by performing constraint detection on the first swept-forward angle, the second swept-forward angle and the swept-forward displacement.

[0029] In a second aspect, the present application provides a device for designing the leading edge of an impeller blade, wherein the root of the leading edge of the blade is swept back and the tip is swept forward, the device comprising:

[0030] The first processing module is used to determine the numerical range of the blade height and the connection point height of the leading edge profile, the blade height is the height of any point on the leading edge profile projected relative to the forehead line, and the connection point height is the blade height corresponding to the connection point between the root swept back profile and the tip swept forward profile;

[0031] A second processing module, configured to divide the numerical interval of the blade height into a first interval and a second interval based on the connection point height;

[0032] A third processing module is used to determine the swept amount corresponding to each first height in the first interval, and to determine the swept amount corresponding to each second height in the second interval; wherein the swept amount is the distance of the first height or the second height relative to the root point of the blade in a direction perpendicular to the forehead line;

[0033] The fourth processing module is used to determine a target root swept profile and a target tip swept profile based on the swept amounts corresponding to each first height and each second height, so as to obtain a target leading edge profile of the blade.

[0034] In a third aspect, the present application provides an oblique flow impeller, the leading edge profile of the blades of the oblique flow impeller is obtained by the impeller leading edge design method of the first aspect or any corresponding embodiment thereof.

[0035] In a fourth aspect, the present application provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the impeller blade leading edge design method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0036] In a fifth aspect, the present application provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the impeller blade leading edge design method of the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 is a schematic flow chart of a method for designing a leading edge of an impeller blade according to an embodiment of the present application;

[0039] Figure 2 is a schematic structural diagram of a blade according to an embodiment of the present application;

[0040] Figure 3 is a schematic flow chart of another impeller blade leading edge design method according to an embodiment of the present application;

[0041] Figure 4 is a schematic diagram of a leading edge profile control function according to an embodiment of the present application;

[0042] Figure 5 is a schematic diagram of performance comparison of an oblique flow impeller according to an embodiment of the present application;

[0043] Figure 6 is a structural block diagram of a blade leading edge design device for an impeller according to an embodiment of the present application;

[0044] Figure 7 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0046] The high-pressure ratio diagonal flow compressor can effectively improve the power-to-weight ratio of the turboshaft engine. Its diagonal flow impeller design usually has the characteristics of high blade tip Mach number. To achieve high-performance design, the key is to effectively control the shock wave in the blade tip area. The forward-swept design can effectively organize the shock wave structure in the blade tip area and control flow losses, but the simple forward sweep of the leading edge will bring more serious problems such as blade strength. Therefore, how to design the leading edge of the blade to improve the performance of the diagonal flow impeller under the premise of avoiding problems such as blade strength has become a very critical issue.

[0047] According to an embodiment of the present application, an embodiment of a method for designing a leading edge of an impeller blade is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0048] In this embodiment, a method for designing the leading edge of an impeller blade is provided. Figure 1 is a flow chart of a method for designing the leading edge of an impeller blade according to an embodiment of the present application, such as Figure 1 As shown, the process includes the following steps:

[0049] Step S101, determine the numerical range of the blade height and the connection point height of the leading edge profile. The blade height is the height of any point on the leading edge profile projected relative to the forehead line. The connection point height is the blade height corresponding to the connection point between the root swept back profile and the tip swept forward profile.

[0050] Specifically, if Figure 2 As shown in the figure, the height of any point on the leading edge of the blade projected onto the frontal line is recorded as the blade height R h , then the blade height R h The minimum value is the height of the projection of the root point of the blade to the forehead line. The blade height R h The maximum value is the height of the projection of the tip of the blade onto the frontal line.

[0051] In some optional embodiments, by obtaining the blade height R h The value range of is normalized to a closed interval, and the numerical interval of the blade height is obtained [0,1], where the left end point of the numerical interval corresponds to the projection height of the root point of the blade, that is, R h1 = 0, the right end point of the numerical interval corresponds to the projection height of the tip of the blade, i.e. R h2=1. In addition, the root of the leading edge of the blade is swept back and the tip is swept forward. The leading edge profile of the blade is composed of the root swept back profile and the tip swept forward profile. The point where the root swept back profile turns to the tip swept forward profile is the connection point. The part below the connection point is the root swept back profile, and the part above the connection point is the tip swept forward profile. The height of the connection point projected to the forehead line, i.e., the connection point height R1, belongs to the numerical interval [0,1].

[0052] Step S102: dividing the numerical interval of the blade height into a first interval and a second interval based on the connection point height.

[0053] Specifically, with the connection point height R1 as the dividing point, the numerical interval [0,1] of the blade height is divided into a first interval [0,R1) and a second interval [R1,1]. Alternatively, the connection point height R1 can also be included in the first interval, but the present application is not limited to this.

[0054] Step S103, determining the swept amount corresponding to each first height in the first interval, and determining the swept amount corresponding to each second height in the second interval; wherein the swept amount is the distance of the first height or the second height relative to the root point of the blade in a direction perpendicular to the frontal line.

[0055] Specifically, the root point of the blade is taken as the zero point, and for each first height in the first interval [0, R1), it is respectively input into the first profile control function, and the distance of each first height relative to the zero point in the vertical direction of the frontal line is respectively determined to obtain the sweep amount corresponding to each first height. The first height is any height in the first interval [0, R1), and the number of first heights can be sampled according to the actual accuracy requirements. The more sampling points, the higher the accuracy.

[0056] Furthermore, for each second height in the second interval [R1,1], it is respectively input into the second profile control function, and the distance of each second height relative to the zero point in the vertical direction of the forehead line is respectively determined to obtain the sweep amount corresponding to each second height. Wherein, the second height is any height in the first interval [0,R1), and the number of second heights can be sampled according to the actual accuracy requirements. The more sampling points, the higher the accuracy.

[0057] Step S104, based on the sweep amounts corresponding to each first height and each second height, a target root swept profile and a target tip swept profile are determined to obtain a target leading edge profile of the blade.

[0058] Specifically, according to the swept amount corresponding to each first height and each second height, the target root swept profile and the target tip swept profile are constructed, so as to determine the degree of root swept back and tip swept forward of the blade, and obtain the target leading edge profile of the blade. Since the forward sweep of the blade tip can effectively control the flow in the tip area and reduce flow losses, the swept back of the blade is beneficial to improve the strength of the blade itself. Therefore, this embodiment comprehensively utilizes the swept shape feature, and can produce the characteristics of high flow, high load and high efficiency while avoiding the problems of strength and so on in the oblique flow impeller.

[0059] The impeller blade leading edge design method provided in this embodiment divides the numerical interval of the blade height into a first interval and a second interval by using the blade height at the connection point between the root swept profile and the tip swept profile. By determining the swept amount corresponding to each first height in the first interval, a target root swept profile is constructed, and the root area of ​​the blade is swept back to improve the strength of the blade and improve the blade vibration problem. By determining the swept amount corresponding to each second height in the second interval, a target tip swept profile is constructed to make the impeller tip adapt to better supersonic incoming flow. By adopting a structure in which the blade root is swept back and the tip is swept forward, the performance of the inclined flow compressor is improved.

[0060] In this embodiment, a method for designing the leading edge of an impeller blade is provided. Figure 3 is a flow chart of a method for designing the leading edge of an impeller blade according to an embodiment of the present application, such as Figure 3 As shown, the process includes the following steps:

[0061] Step S301, determine the value range of the blade height and the connection point height of the leading edge profile. The blade height is the height of any point on the leading edge profile projected relative to the forehead line. The connection point height is the blade height corresponding to the connection point between the root swept back profile and the tip swept forward profile. For details, please refer to Figure 1 The detailed description of step S101 in the illustrated embodiment will not be repeated here.

[0062] Step S302: Based on the connection point height, the numerical interval of the blade height is divided into a first interval and a second interval. Figure 1 The detailed description of step S102 in the illustrated embodiment will not be repeated here.

[0063] Step S303, determining the swept amount corresponding to each first height in the first interval, and determining the swept amount corresponding to each second height in the second interval; wherein the swept amount is the distance of the first height or the second height relative to the root point of the blade in a direction perpendicular to the frontal line.

[0064] Specifically, the above step S303 includes:

[0065] Step S3031: input each first height in the first interval into the first profile control function to obtain the sweep amount corresponding to each first height.

[0066] Specifically, the first type line control function is Where a, b, c, and d are all constants. Input the first height into f1 to get the sweep amount corresponding to the first height.

[0067] Step S3032, input each second height in the second interval into the second type line control function to obtain the sweep amount corresponding to each second height; wherein, the function values ​​of the first type line control function and the second type line control function at the connection point height are equal, and the function values ​​of the first-order derivative of the first type line control function and the first-order derivative of the second type line control function at the connection point height are equal.

[0068] Specifically, the second type line control function is Where, e, f, g, and h are all constants. By inputting each second height into f2, the corresponding sweep amount of each second height can be obtained.

[0069] In some optional implementations, several sets of polynomial functions can be established to describe the sweep amount distribution of the leading edge profile of the blade, and the corresponding piecewise functions of the several sets of polynomial functions in the closed interval [0,1] are recorded as f(R h ), R h f(R h ) is the only independent variable. For example, f(R h ) function is as follows:

[0070]

[0071] Among them, f(R h ) is the sweep of the impeller leading edge profile.

[0072] It should be noted that f(R h ) and its first-order derivative are continuous at R1. The continuity of the first-order derivative can ensure that the leading edge profile has no sharp corners or inflection points at R1, and the transition between the root sweep and the tip sweep is smooth, thereby ensuring that the stress on the leading edge of the blade is relatively small.

[0073] The embodiment of the present application uses the first profile control function and the second profile control function to determine the swept amount corresponding to each first height in the first interval and each second height in the second interval, and then determines the degree of swept back of the leading edge root and swept forward of the tip of the blade, thereby obtaining the leading edge profile of the blade. In addition, by ensuring that the first profile control function and the second profile control function, and the first-order derivative of the first profile control function and the first-order derivative of the second profile control function are continuous at the height of the connection point, the leading edge profile is ensured to have a smooth transition, reduce the stress on the leading edge of the blade, and reduce the vibration of the blade.

[0074] Step S304, based on the sweep amounts corresponding to each first height and each second height, determine a target root swept profile and a target tip swept profile to obtain a target leading edge profile of the blade.

[0075] Specifically, the above step S304 includes:

[0076] Step S3041, constructing a root swept profile line based on the swept amount corresponding to each first height, and determining a first swept angle between the root swept profile line and the forehead line.

[0077] Specifically, see again Figure 2 After constructing the root swept profile using the swept amount corresponding to each first height, determine the first swept angle α1 between the root swept profile and the frontal line. It should be noted that the first swept angle α1 can be used to characterize the inclination degree of the leading edge of the blade near the root.

[0078] Step S3042, obtain the second sweep angle between the first connecting line and the frontal line according to the tip point height of the blade and the sweep amount corresponding to the tip point height; wherein the tip point height is the blade height corresponding to the tip point of the blade, and the first connecting line is the line between the tip point and the root point.

[0079] Specifically, see again Figure 2 , according to the tip height, i.e. R h2 = 1 and the tip height R h2 The corresponding sweep amount L2 is calculated using the formula α2 = arctan(L2 / R h2 ), the second sweep angle α2 between the line connecting the tip point and the root point and the forehead line is calculated. It should be noted that the second sweep angle α2 can be used to characterize the overall inclination of the root swept profile line.

[0080] Step S3043: If it is detected that the first sweep angle, the second sweep angle, and the sweep amount corresponding to the connection point height meet the first preset constraint condition, the root swept profile line is used as the target root swept profile line.

[0081] In an optional embodiment, the first preset constraint condition includes: the range of the first sweep angle is 0 to -30°, the range of the second sweep angle is 0 to -45°, and the sweep amount corresponding to the connection point height is not less than 0 and not greater than the blade hub length L h 0.25 times of the root sweep profile. It should be noted that the clockwise angle of the root sweep profile relative to the forehead line is negative, and the counterclockwise angle is positive. Therefore, by constraining the first sweep angle, the second sweep angle, and the sweep amount corresponding to the connection point height, it is ensured that the target root sweep profile meets the performance and reliability requirements.

[0082] In an optional embodiment, if it is detected that the first sweep angle α1 is 0 to -30°, the second sweep angle α2 is 0 to -45°, and the maximum sweep amount of the root swept profile, that is, the sweep amount f(R1) corresponding to the connection point height meets 0≤f(R1)≤0.25L h , the root swept profile is taken as the target root swept profile.

[0083] The embodiment of the present application utilizes the sweep amount corresponding to each first height to construct a root swept profile line, and performs constraint verification on the first sweep angle between the root swept profile line and the frontal line, the second sweep angle between the line connecting the tip point and the root point and the frontal line, and the maximum sweep amount of the root swept profile line. If the verification passes, the root swept profile line is used as the target root swept profile line, and the sweep degree of the leading edge of the blade is then designed.

[0084] Step S3044, constructing a tip-swept forward profile based on the sweep amount corresponding to each second height, and determining a first sweep angle between the tip-swept forward profile and the forehead line.

[0085] Specifically, see again Figure 2 After constructing the tip swept profile using the swept amount corresponding to each second height, determine the first swept angle β1 between the tip swept profile and the frontal line. It should be noted that the first swept angle β1 can be used to characterize the inclination degree of the blade leading edge near the tip.

[0086] Step S3045, determining the second forward sweep angle between the second connecting line and the forehead line according to the connecting point height and the corresponding sweep amount of the connecting point height, the tip point height and the corresponding sweep amount of the tip point height; wherein the second connecting line is the connecting line between the tip point and the connecting point.

[0087] Specifically, see again Figure 2 According to the connection point height R1 and the sweep amount corresponding to the connection point height R1, that is, f(R1)=L1, the formula β2=arctan((L1-L2) / (R h2 -R1)), the second sweep angle β2 between the line connecting the tip point and the connection point and the forehead line is calculated. It should be noted that the second sweep angle β2 can be used to characterize the overall inclination of the tip sweep profile line.

[0088] Step S3046, if it is detected that the difference between the first sweep angle, the second sweep angle, and the sweep amount corresponding to the connection point height and the sweep amount corresponding to the tip point height meets the second preset constraint condition, the tip swept profile line is used as the target tip swept profile line.

[0089] In an optional embodiment, the second preset constraint condition includes: the range of the first sweep angle is 0 to 20°, the range of the second sweep angle is 0 to 30°, and the difference between the sweep amount corresponding to the connection point height and the sweep amount corresponding to the tip point height is not less than the blade span length L s 0.05 times and not more than 0.25 times the blade span length. It should be noted that the tip forward sweep profile is negative in the clockwise direction and positive in the counterclockwise direction relative to the frontal line. Thus, by constraining the detection of the first forward sweep angle, the second forward sweep angle and the forward sweep back displacement, i.e. the difference between L1 and L2, it is ensured that the target tip forward sweep profile meets the performance and reliability requirements.

[0090] In an optional embodiment, if it is detected that the first sweep angle β1 is 0-20°, the second sweep angle β2 is 0-30°, and the sweep amount of the tip sweep line meets 0.05L s ≤f(R1)-f(1)≤0.25L s , the tip forward swept profile line is taken as the target tip forward swept profile line.

[0091] The embodiment of the present application utilizes the sweep amount corresponding to each second height to construct the tip swept-forward profile line, and performs constraint verification on the first sweep angle between the tip swept-forward profile line and the frontal line, the second sweep angle between the line connecting the tip point and the connecting point and the frontal line, and the swept-back amount of the tip swept-forward profile line. If the verification passes, the tip swept-forward profile line is used as the target tip swept-forward profile line, and the tip swept degree of the leading edge of the blade is then designed.

[0092] Step S3047, obtaining the target leading edge profile of the blade according to the target root swept profile and the target tip swept profile.

[0093] The impeller blade leading edge design method provided in this embodiment divides the numerical interval of the blade height into a first interval and a second interval by using the blade height at the connection point between the root swept profile and the tip swept profile. By determining the swept amount corresponding to each first height in the first interval and performing constraint verification, a target root swept profile is constructed, thereby improving the strength of the blade and improving the blade vibration problem. By determining the swept amount corresponding to each second height in the second interval and performing constraint verification, a target tip swept profile is constructed, so that the impeller tip can adapt to better supersonic incoming flow. By adopting a composite swept design in which the leading edge of the oblique flow impeller is swept in the root area and swept forward in the local area of ​​the tip, the performance of the high-pressure ratio oblique flow impeller is improved while avoiding problems such as blade strength.

[0094] The blade leading edge design scheme of the impeller of the present application is described in detail below with reference to an application example.

[0095] In this application example, the leading edge profile control function of the blade is shown in the following formula:

[0096]

[0097] Among them, f(R h )The function is continuous at f(0.7387)=16.2, and the first-order derivative f′(0.7387)=31.6 is also continuous, f(R h ) Function distribution is as follows Figure 4 shown.

[0098] The performance of the oblique flow impeller under the leading edge of the traditional straight leading edge (the straight line between the root point and the tip point) and the composite blade of this application example were numerically analyzed by computational fluid dynamics (CFD), and the following results were obtained: Figure 5 The characteristic line of the diagonal flow compressor is shown.

[0099] Depend on Figure 5 It can be seen that compared with the straight swept leading edge, after the composite swept leading edge is adopted in this application example, the efficiency of the inclined flow compressor is improved to varying degrees within the entire characteristic line flow range, and the peak efficiency of the inclined flow impeller increases by about 0.3 percentage points.

[0100] The leading edge of the inclined flow impeller adopts partial radial height forward sweep and root backward sweep, which is mainly manifested in that the leading edge of the blade is swept backward when the incoming flow Mach number is below 1.0, and the leading edge of the blade is swept forward when the incoming flow Mach number is above 1.3, and the leading edge of the blade may not be swept when the incoming flow Mach number is 1.0-1.3.

[0101] The oblique flow impeller with a composite swept leading edge design proposed in this application has the design feature of overall backward sweeping to ensure the strength of the oblique flow impeller to meet the needs of engineering applications, while forward sweeping in the local area of ​​the blade tip can well adapt to the high pressure ratio and high blade tip flow Mach number, effectively control the complex shock wave structure in the blade tip area, reduce flow losses, and improve the performance of the oblique flow impeller.

[0102] In this embodiment, a device for designing the leading edge of an impeller blade is also provided, and the device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0103] This embodiment provides a blade leading edge design device for an impeller, wherein the root of the blade leading edge is swept back and the tip is swept forward, such as Figure 6 As shown, including:

[0104] The first processing module 601 is used to determine the value range of the blade height and the connection point height of the leading edge profile, the blade height is the height of any point on the leading edge profile projected relative to the forehead line, and the connection point height is the blade height corresponding to the connection point between the root swept back profile and the tip swept forward profile;

[0105] A second processing module 602 is used to divide the numerical interval of the blade height into a first interval and a second interval based on the connection point height;

[0106] The third processing module 603 is used to determine the swept amount corresponding to each first height in the first interval, and to determine the swept amount corresponding to each second height in the second interval; wherein the swept amount is the distance of the first height or the second height relative to the root point of the blade in a direction perpendicular to the forehead line;

[0107] The fourth processing module 604 is used to determine a target root swept profile and a target tip swept profile based on the swept amounts corresponding to each first height and each second height, so as to obtain a target leading edge profile of the blade.

[0108] In some optional implementations, the third processing module 603 is further configured to:

[0109] Input each first height in the first interval into the first profile control function to obtain the sweep amount corresponding to each first height;

[0110] Input each second height in the second interval into the second profile control function to obtain the sweep amount corresponding to each second height; wherein, the function values ​​of the first profile control function and the second profile control function at the connection point height are equal, and the function values ​​of the first-order derivative of the first profile control function and the first-order derivative of the second profile control function at the connection point height are equal.

[0111] In some optional implementations, the fourth processing module 604 is further configured to:

[0112] constructing a root swept profile line based on the swept amount corresponding to each first height, and determining a first swept angle between the root swept profile line and the frontal line;

[0113] According to the tip point height of the blade and the sweep amount corresponding to the tip point height, a second sweep angle between the first connecting line and the frontal line is obtained; wherein the tip point height is the blade height corresponding to the tip point of the blade, and the first connecting line is the connecting line between the tip point and the root point;

[0114] If it is detected that the first sweep angle, the second sweep angle, and the sweep amount corresponding to the connection point height meet the first preset constraint condition, the root swept profile line is used as the target root swept profile line.

[0115] In some optional embodiments, the first preset constraint includes: the range of the first sweep angle is 0 to -30°, the range of the second sweep angle is 0 to -45°, and the sweep amount corresponding to the connection point height is not less than 0 and not greater than 0.25 times the length of the blade hub.

[0116] In some optional implementations, the fourth processing module 604 is further configured to:

[0117] constructing a tip forward sweep profile line based on the sweep amount corresponding to each second height, and determining a first forward sweep angle between the tip forward sweep profile line and the forehead line;

[0118] Determine a second forward sweep angle between the second connecting line and the forehead line according to the height of the connecting point and the sweep amount corresponding to the height of the connecting point, the height of the tip point and the sweep amount corresponding to the height of the tip point; wherein the second connecting line is the connecting line between the tip point and the connecting point;

[0119] If it is detected that the difference between the first sweep angle, the second sweep angle, and the sweep amount corresponding to the connection point height and the sweep amount corresponding to the tip point height meets the second preset constraint condition, the tip swept profile line is used as the target tip swept profile line.

[0120] In some optional embodiments, the second preset constraint includes: the range of the first sweep angle is 0 to 20°, the range of the second sweep angle is 0 to 30°, and the difference between the sweep amount corresponding to the connection point height and the sweep amount corresponding to the tip point height is not less than 0.05 times the span length of the blade and not greater than 0.25 times the span length of the blade.

[0121] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0122] The impeller blade leading edge design device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0123] The embodiment of the present application also provides an oblique flow impeller, the leading edge profile of the blades of the oblique flow impeller is obtained by the leading edge design method of the impeller blades of the above embodiment.

[0124] The present application also provides a computer device having the above Figure 6 The impeller blade leading edge design device is shown.

[0125] See also Figure 7 , Figure 7is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present application, such as Figure 7 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 7 A processor 10 is taken as an example.

[0126] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0127] The memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0128] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0129] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0130] The computer device also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 7 The example of connecting through bus is taken in the following.

[0131] The input device 30 can receive input digital or character information, and generate key signal input related to the user settings and function control of the computer device, such as a touch screen, a keypad, a mouse, a track pad, a touch pad, an indicator bar, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED) and a tactile feedback device (e.g., a vibration motor), etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0132] The embodiment of the present application also provides a computer-readable storage medium. The above method according to the embodiment of the present application can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0133] Part of the present application may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present application through the operation of the computer. Those skilled in the art should understand that the existence of computer program instructions in computer-readable media includes but is not limited to source files, executable files, installation package files, etc., and accordingly, the way in which computer program instructions are executed by a computer includes but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to the computer.

[0134] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for designing the leading edge of an impeller blade, characterized in that: The leading edge of the blade has a root swept back and a tip swept forward, the method comprising: Determine the numerical range of the blade height and the connection point height of the leading edge profile, the blade height is the height of any point on the leading edge profile projected relative to the forehead line, and the connection point height is the blade height corresponding to the connection point between the root swept back profile and the tip swept forward profile; Based on the connection point height, dividing the numerical interval of the blade height into a first interval and a second interval; Determine the swept amount corresponding to each first height in the first interval, and determine the swept amount corresponding to each second height in the second interval; wherein the swept amount is the distance of the first height or the second height relative to the root point of the blade in a direction perpendicular to the frontal line; Based on the sweep amounts corresponding to each first height and each second height, a target root swept profile line and a target tip swept profile line are determined to obtain a target leading edge profile line of the blade.

2. The method according to claim 1, characterized in that The step of determining the swept amount corresponding to each first height in the first interval and determining the swept amount corresponding to each second height in the second interval comprises: Input each first height in the first interval into the first profile control function to obtain the sweep amount corresponding to each first height; Input each second height in the second interval into the second type line control function to obtain the sweep amount corresponding to each second height; wherein, the function values ​​of the first type line control function and the second type line control function at the height of the connection point are equal, and the function values ​​of the first-order derivative of the first type line control function and the first-order derivative of the second type line control function at the height of the connection point are equal.

3. The method according to claim 1, characterized in that The step of determining a target root swept profile based on the swept amount corresponding to each first height and each second height includes: constructing a root swept profile line based on the swept amount corresponding to each first height, and determining a first swept angle between the root swept profile line and the frontal line; According to the tip point height of the blade and the sweep amount corresponding to the tip point height, a second sweep angle between the first connecting line and the frontal line is obtained; wherein the tip point height is the blade height corresponding to the tip point of the blade, and the first connecting line is the connecting line between the tip point and the root point; If it is detected that the first sweep angle, the second sweep angle, and the sweep amount corresponding to the connection point height meet the first preset constraint condition, the root swept profile line is used as the target root swept profile line.

4. The method according to claim 3, characterized in that The first preset constraint conditions include: the range of the first sweep angle is 0 to -30°, the range of the second sweep angle is 0 to -45°, and the sweep amount corresponding to the connection point height is not less than 0 and not greater than 0.25 times the length of the blade hub.

5. The method according to claim 3, characterized in that: The step of determining the target tip forward swept profile based on the swept amount corresponding to each first height and each second height includes: constructing a tip forward sweep profile line based on the sweep amount corresponding to each second height, and determining a first forward sweep angle between the tip forward sweep profile line and the forehead line; Determine a second forward sweep angle between the second connecting line and the forehead line according to the height of the connecting point and the sweep amount corresponding to the height of the connecting point, the height of the tip point and the sweep amount corresponding to the height of the tip point; wherein the second connecting line is the connecting line between the tip point and the connecting point; If it is detected that the difference between the first sweep angle, the second sweep angle, the sweep amount corresponding to the connection point height and the sweep amount corresponding to the tip point height meets the second preset constraint condition, the tip swept profile line is used as the target tip swept profile line.

6. The method according to claim 5, characterized in that The second preset constraint conditions include: the range of the first sweep angle is 0 to 20°, the range of the second sweep angle is 0 to 30°, and the difference between the sweep amount corresponding to the connection point height and the sweep amount corresponding to the tip point height is not less than 0.05 times the span length of the blade and not more than 0.25 times the span length of the blade.

7. A device for designing the leading edge of an impeller blade, characterized in that: The leading edge of the blade has a root portion swept back and a tip portion swept forward, the device comprising: The first processing module is used to determine the numerical range of the blade height and the connection point height of the leading edge profile, the blade height is the height of any point on the leading edge profile projected relative to the forehead line, and the connection point height is the blade height corresponding to the connection point between the root swept back profile and the tip swept forward profile; A second processing module, configured to divide the numerical interval of the blade height into a first interval and a second interval based on the connection point height; A third processing module is used to determine the swept amount corresponding to each first height in the first interval, and to determine the swept amount corresponding to each second height in the second interval; wherein the swept amount is the distance of the first height or the second height relative to the root point of the blade in a direction perpendicular to the forehead line; The fourth processing module is used to determine a target root swept profile and a target tip swept profile based on the swept amounts corresponding to each first height and each second height, so as to obtain a target leading edge profile of the blade.

8. An oblique flow impeller, characterized in that: The leading edge profile of the blade of the diagonal flow impeller is obtained by the leading edge design method of the impeller blade according to any one of claims 1 to 6.

9. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the impeller blade leading edge design method according to any one of claims 1 to 6 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the impeller blade leading edge design method according to any one of claims 1 to 6.

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