Design method of gas compressor flow channel regulation and control component based on bionic ridge

Abstract

The embodiment of the invention discloses a method for designing a flow channel regulation and control component of a gas compressor based on a bionic ridge. The method comprises the following steps: extracting a ridge profile curve from a ridge specimen picture of a peeler turtle; extracting contour control points to obtain a contour control point sequence; based on the contour control point sequence, generating a two-side ridge fitting curve; the target ridge height and the target upper end width are used as control variables, two curves in the two-side ridge fitting curves are scaled and shifted, and a bionic ridge section maintaining the original contours of the two-side ridge fitting curves is obtained; fitting the blade geometric data of the gas compressor stationary blade to obtain a first ridge position parameter and a second ridge position parameter associated with the gas compressor stationary blade, and further obtaining a ridge axial guide molded line; adjusting the position posture of the bionic dorsal ridge section, and carrying out lofting along the axial guide molded line of the dorsal ridge to generate a three-dimensional bionic dorsal ridge structure; the three-dimensional bionic ridge structure serves as a gas compressor flow channel regulation and control component and is integrated in a gas compressor flow channel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow control of impeller machinery, and in particular to a design method of a compressor flow passage regulating component based on bionic back ridges. BACKGROUND

[0002] As core energy conversion equipment, impeller machinery is widely used in aerospace propulsion systems, ship power propulsion systems, energy and chemical industries; among them, aeroengines and gas turbines are key fields with core competitiveness. As the core component of aeroengines and gas turbines, the performance of the compressor directly determines the thrust-to-weight ratio, thermal efficiency and reliability of the whole machine. With the development of aviation technology towards high thrust-to-weight ratio and high maneuverability, the compressor needs to meet the dual demands of improving overall load and reducing stage number while increasing single-stage load to reduce the weight and complexity of the whole machine; heavy-duty gas turbines also have urgent demands for "high load, high efficiency and high reliability" of the compressor.

[0003] However, with the continuous increase of the load of the compressor, the flow characteristics in the cascade flow passage have changed significantly. On the one hand, the transverse pressure gradient effect in the cascade flow passage is significantly enhanced due to the increase of the load; on the other hand, the streamwise adverse pressure gradient is intensified due to the expansion or contraction of the flow passage. The above two factors jointly induce three-dimensional flow separation in the cascade flow passage, and the low-energy fluid in the boundary layer of the end wall and the blade surface no longer follows the main flow, but migrates along the transverse direction to the suction surface and accumulates near the suction surface to form a separation vortex.

[0004] Flow separation can be regarded as a self-organizing phenomenon of flow field, but its unsteady effect will have a significant negative impact on the performance of the compressor. Lightly, it leads to an increase in flow loss and reduces the isentropic efficiency of the compressor; heavily, it causes flow field instability, seriously affects the system operation stability, and even causes engine failure. SUMMARY

[0005] Therefore, the embodiments of the present application provide a design method of a compressor flow passage regulating component based on bionic back ridges, which at least solves the problem of flow separation in the end region of the compressor.

[0006] The technical scheme of the embodiments of the present application is as follows: In a first aspect, the embodiments of the present application provide a design method of a compressor flow passage regulating component based on bionic back ridges, comprising: obtaining a back ridge specimen picture of a box turtle, extracting a back ridge contour curve from the back ridge specimen picture, extracting contour control points of the back ridge contour curve to obtain a contour control point sequence, and generating two-side back ridge fitting curves based on the contour control point sequence; scaling and shifting two curves in the two-side spine fitting curves to obtain a biomimetic spine section that maintains an original profile of the two-side spine fitting curves, a lower end width of the biomimetic spine section being determined based on the target spine height, the target upper end width and a shape of the original profile; obtaining blade geometry data of the compressor stator blade, fitting the blade geometry data to obtain a first spine position parameter associated with the compressor stator blade, determining a second spine position parameter based on the first spine position parameter, and obtaining a spine axial guide curve based on the first spine position parameter and the second spine position parameter; determining a third spine position parameter based on the lower end width, adjusting a position and posture of the biomimetic spine section according to the second spine position parameter and the third spine position parameter, lofting along the spine axial guide curve to generate a three-dimensional biomimetic spine structure, and integrating the three-dimensional biomimetic spine structure as a compressor flow passage regulating component in a compressor flow passage.

[0007] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects: The method for designing a compressor flow passage regulating component based on a biomimetic spine provided by the present application obtains a spine specimen picture of a box turtle, and extracts a spine profile curve from the spine specimen picture. The physical form of the spine of the box turtle is converted into a quantifiable two-dimensional curve, which provides a geometric basis for subsequent design of the biomimetic spine. The profile control points of the spine profile curve are extracted to obtain a sequence of profile control points. The problem of insufficient density of key points is solved by increasing the density between every two profile control points, and the local curvature details are increased. Based on the sequence of profile control points, two-side spine fitting curves are generated. One side curve of the fitted spine is symmetrically mapped to solve the problem of slight asymmetry of the original spine specimen of the box turtle. Two curves in the two-side spine fitting curves are scaled and shifted to obtain a biomimetic spine section that maintains the original profile of the two-side spine fitting curves. The fixed profile of the biological form of the spine of the box turtle is converted into an engineering adjustable parameterized model through scaling and shifting operations, and the biomimetic spine section is generated on the premise of retaining the fluid control advantage of the spine of the box turtle. Blade geometry data of the compressor stator blade are obtained, and based on the blade geometry data, a path for lofting of the biomimetic spine section is determined, and the spine axial guide curve ensures that the three-dimensional biomimetic spine structure extends along the flow passage. The position and posture of the biomimetic spine section are adjusted according to the second spine position parameter and the third spine position parameter, and lofting is performed along the spine axial guide curve to generate a three-dimensional biomimetic spine structure. The adjusted position and posture are avoided from deviating due to angle deviation, and additional flow loss is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort. Figure 1 A flow chart of a design method of a compressor flow passage regulating component based on a bionic dorsal spine provided in an embodiment of the present application; Figure 2 A bionic structure extraction diagram provided in an embodiment of the present application; Figure 3 A bionic dorsal spine regulating structure geometric diagram provided in an embodiment of the present application; Figure 4 A bionic dorsal spine regulating structure provided in an embodiment of the present application Figure 3 An A-A sectional view of the bionic dorsal spine regulating structure in the middle of the bionic dorsal spine regulating structure provided in an embodiment of the present application; Figure 5 A stator blade geometric diagram provided in an embodiment of the present application; Figure 6 A stator blade top view positioning profile diagram provided in an embodiment of the present application; Figure 7 A compressor flow passage geometric diagram provided in an embodiment of the present application; Figure 8 A compressor flow passage provided in an embodiment of the present application Figure 7 A B-B sectional view of the compressor flow passage in the middle of the compressor flow passage provided in an embodiment of the present application; Figure 9 A compressor flow passage provided in an embodiment of the present application Figure 7 A C-C sectional view of the compressor flow passage in the middle of the compressor flow passage provided in an embodiment of the present application; Figure 10 An outlet total pressure loss coefficient along a dimensionless blade height distribution diagram provided in an embodiment of the present application; Reference signs: Compressor flow passage-1; Stator blade-2; Three-dimensional bionic dorsal spine structure-3; Stator blade suction surface section-201; Stator blade pressure surface section-202; Leading edge positioning line-203; Axial positioning line-204; Deflection positioning line-205; Suction surface positioning line-206; Stator blade positioning point-207; Trailing edge section-208; Leading edge section-209; Lower end line of bionic dorsal spine section-301; Upper end line of bionic dorsal spine section-302; Two-side dorsal spine fitting curve-303; Dorsal spine axial guide profile-304; Bionic dorsal spine positioning point-305; Target upper end width- w 1 ; Lower end width- w 2 ; Target dorsal spine height- H ; Stator blade chord length- L ; Stator blade axial chord length-L x ; the circumferential chord length of the stationary blade L y ; the third preset distance N 1 ; the fourth preset distance N 2 ; the deflection angle θ ; L b - the three-dimensional biomimetic dorsal chord length. DETAILED DESCRIPTION

[0009] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0010] In the following description, “some embodiments” are related to a subset of all possible embodiments, but it can be understood that “some embodiments” can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0011] It should be noted that the terms “first\second\third” involved in the embodiments of the present application are only to distinguish similar objects, and do not represent the specific order of the objects. It can be understood that “first\second\third” can be interchanged with specific order or sequence as allowed, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0012] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as that generally understood by those of ordinary skill in the art to which the embodiments of the present application belong. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such.

[0013] The embodiments of the present application provide a biomimetic dorsal spine-based compressor flow passage regulating component design method, Figure 1 A flowchart of a biomimetic dorsal spine-based compressor flow passage regulating component design method provided by the embodiments of the present application is shown in Figure 1 The method comprises at least the following steps: In step S110, a back ridge specimen picture of the Emyda sinensis is obtained, a back ridge contour curve is extracted from the back ridge specimen picture, contour control points of the back ridge contour curve are extracted to obtain a contour control point sequence, and a two-side back ridge fitting curve 303 is generated based on the contour control point sequence. For one Emyda sinensis specimen, a high-resolution single-lens reflex camera or a photography module of a professional three-dimensional scanning device is used to carry out multi-view shooting. The shooting points are set at a fixed step along the direction from the head to the tail of the back ridge of the Emyda sinensis, and at the same time, different angles are used to shoot the same area. Finally, multiple back section pictures of the Emyda sinensis are obtained. Through manual comparison and quantitative analysis of an image quality evaluation software, one picture with the best comprehensive quality is finally selected from the multiple back section pictures as the back ridge specimen picture.

[0014] The high-definition and low-interference back ridge specimen picture determines the accuracy and reliability of the subsequent curve fitting result.

[0015] The core feature of the back ridge of the Emyda sinensis is the longitudinally extended back ridge contour structure, and these back ridge contours need to be positioned as the target of contour extraction. Key points are added to the back ridge specimen picture of the Emyda sinensis, and a back ridge contour curve is extracted based on the key points. The operation of extracting the back ridge contour curve can convert the physical form of the back ridge of the Emyda sinensis into a quantifiable two-dimensional curve, providing a geometric basis for the subsequent design of the biomimetic back ridge section.

[0016] The extracted back ridge contour curve may have the following problems: (1) insufficient key point density: the added key points may miss local curvature details; (2) image acquisition or extraction of the back ridge contour curve may introduce noise points; (3) the back ridge specimen of the Emyda sinensis may have slight asymmetry.

[0017] Based on the above problems, contour control points are extracted from the back ridge contour curve to obtain a contour control point sequence. The distance between the contour control points is smaller than the distance between the key points, which is equivalent to increasing the density between every two contour control points, solving the problem of insufficient key point density and increasing local curvature details. It ensures that the subsequent biomimetic back ridge section is accurately restored to the biomechanical characteristics of the back ridge of the Emyda sinensis.

[0018] In addition, based on the contour control point sequence, a two-side back ridge fitting curve is generated. In the fitting process, the noise points are deleted or modified, so that all the contour control points are fitted onto a smooth curve. And the curve of one side of the back ridge obtained by fitting is symmetrically mapped, solving the problem of slight asymmetry of the original back ridge specimen of the Emyda sinensis. Based on this, the effect of the subsequent three-dimensional biomimetic back ridge structure on suppressing the secondary flow vortex in the end region of the compressor is improved, and the flow field uniformity and compressor efficiency are improved.

[0019] In step S120, a target back ridge height is determined based on the back ridge height of the back ridge specimen picture. Hand target upper end width w 1 For control variables, the two curves in the curve fitting 303 of the two sides of the back ridge are scaled and offset to obtain a biomimetic back ridge section that maintains the original profile of the two sides of the back ridge fitting curve 303, the lower end width of the biomimetic back ridge section w 2 Based on the target back ridge height H , the target upper end width w 1 and the shape of the original profile is determined; The original profile of the biomimetic back ridge is a fixed profile, the back ridge height and the upper end width of the biomimetic back ridge section are control variables, and the lower end width of the biomimetic back ridge changes with the changes of the back ridge height and the upper end width of the biomimetic back ridge. Therefore, according to different requirements, the back ridge height and the upper end width of the biomimetic back ridge section are changed, different biomimetic back ridge sections can be obtained, and different three-dimensional biomimetic back ridge structures are determined.

[0020] An offset is added to each of the two curves in the two sides of the biomimetic back ridge fitting line through a program, and the double of the offset of each side is the upper end width of the biomimetic back ridge.

[0021] Because the heights of different compressor flow channels are different, scaling makes the back ridge section height adapt to the actual flow channel space, and equidimensional scaling ensures that the curvature ratio of the original profile of the back ridge is unchanged, and the hydrodynamic advantage of the original biological profile is retained. The lower end width of the biomimetic back ridge section is automatically calculated based on the original profile shape, avoiding flow field distortion caused by manual intervention.

[0022] The scaling and offset operations convert the fixed profile of the back ridge biological form of the box turtle into engineering adjustable parameters, and on the premise of retaining the fluid control advantage of the back ridge of the box turtle, realize precise matching with the size of the compressor flow channel and the distribution of the static blade, and finally improve the flow stability of the compressor flow channel under high load working condition.

[0023] In step S130, the blade geometry data of the compressor static blade 2 is obtained, the first back ridge position parameter associated with the compressor static blade 2 is obtained by fitting the blade geometry data, the second back ridge position parameter is determined based on the first back ridge position parameter, and the back ridge axial guide profile 304 is obtained based on the first back ridge position parameter and the second back ridge position parameter; The compressor static blade is a non-rotating blade fixed to the wall end of the compressor flow channel, and the function of the compressor static blade is to guide the direction of the airflow in the compressor and expand the pressure.

[0024] Based on the first back ridge position parameter and the second back ridge position parameter obtained from the blade geometry data of the compressor static blade, the starting point and the extension path of the back ridge axial guide profile are derived to ensure that the obtained three-dimensional biomimetic back ridge structure works cooperatively with the compressor static blade.

[0025] The dorsal axial guide curve provides a path for lofting the biomimetic dorsal section, ensuring that the three-dimensional biomimetic dorsal structure extends along the flow passage. The dorsal axial guide curve inherits the suction surface streamline trend of the compressor stator blade, allowing the three-dimensional biomimetic dorsal structure to naturally blend into the flow field of the compressor and suppress secondary flow vortices in the compressor.

[0026] In step S140, the third dorsal position parameter is determined based on the lower end width w 2 After adjusting the position and posture of the biomimetic dorsal section according to the second dorsal position parameter and the third dorsal position parameter, the biomimetic dorsal section is lofted along the dorsal axial guide curve 304 to generate a three-dimensional biomimetic dorsal structure 3. The three-dimensional biomimetic dorsal structure 3 is integrated into the compressor flow passage 1 as a compressor flow passage regulating component.

[0027] When lofting the biomimetic dorsal section, positioning is required at two locations. The first location is on the biomimetic dorsal section, and the second location is on the position of the stator blade in the compressor. The two locations are then corresponded, and the biomimetic dorsal section is lofted along the dorsal axial guide curve to generate a three-dimensional biomimetic dorsal structure.

[0028] The third dorsal position parameter of the biomimetic dorsal section is determined. The third dorsal position parameter provides a positioning reference on the biomimetic dorsal section, ensuring accurate positioning of the biomimetic dorsal section during lofting. The three-dimensional biomimetic dorsal structure generated by lofting the biomimetic dorsal section along the dorsal axial guide curve cooperates with the flow field of the compressor stator blade, avoiding angle deviation of the adjusted position and posture and causing additional flow loss.

[0029] By adjusting the size and shape of the biomimetic dorsal section, the first dorsal position parameter, and the second dorsal position parameter, different three-dimensional biomimetic dorsal structures can be constructed to quickly adapt to the flow passage size of different compressors. Under the premise of maintaining the original flow passage structure, the three-dimensional biomimetic dorsal structure is integrated into the flow passage wall, which is low in cost and significantly optimizes the aerodynamic performance and operating stability of the compressor.

[0030] The application provides a compressor flow passage regulating component design method based on a bionic spine. A spine specimen picture of a box turtle is obtained, and a spine contour curve is extracted from the spine specimen picture. The physical form of the box turtle spine is converted into a quantifiable two-dimensional curve, providing a geometric basis for subsequent bionic spine design. The contour control points of the spine contour curve are extracted to obtain a contour control point sequence. By increasing the density between every two contour control points, the problem of insufficient key point density is solved, and local curvature details are increased. Based on the contour control point sequence, two-side spine fitting curves are generated. The slight asymmetry of the original box turtle spine specimen is solved by symmetric mapping of one side of the fitting spine curve. The two curves in the two-side spine fitting curve are scaled and offset to obtain a bionic spine section that maintains the original contour of the two-side spine fitting curve. The fixed contour of the box turtle spine biological form is converted into an engineering adjustable parameterized model through scaling and offset operations, and the bionic spine section is generated under the premise of retaining the fluid control advantage of the box turtle spine. The blade geometry data of the compressor static blade are obtained, and the path of the bionic spine section is determined based on the blade geometry data. The spine axial guide type ensures that the three-dimensional bionic spine structure extends along the flow passage. The position and posture of the bionic spine section are adjusted according to the second spine position parameter and the third spine position parameter, and the three-dimensional bionic spine structure is generated by lofting along the spine axial guide type line. The adjusted position and posture deviation caused by angle deviation is avoided, and additional flow loss is generated.

[0031] In some embodiments, in step S110, the "spine contour curve is extracted from the spine specimen picture", comprising: Step S1101, importing the spine specimen picture into Catia software; Step S1102, using the key point adding function of the Catia software, adding a key point every first preset distance along the ridge line contour of the box turtle spine in the spine specimen picture to obtain a plurality of key points; Step S1103, using the curve fitting function of the Catia software, connecting the plurality of key points in sequence with a curve to obtain a spine contour curve.

[0032] Catia is a three-dimensional digital design and engineering software, which is applied to the fields of aerospace, automobile manufacturing, industrial product development and the like, and supports full-process digital solutions from concept design, detailed modeling to production manufacturing. The key point adding and curve fitting functions of Catia can accurately process the spine specimen picture of the box turtle.

[0033] Figure 2 The bionic structure extraction diagram provided for the embodiments of the application.

[0034] As Figure 2(Left) as shown, the dorsal spine specimen picture into Catia software, dorsal spine specimen picture alone into a component layer. Using the key point adding function, in a separate layer, along the edge of the turtle spine contour by the first preset distance to add key points, get a plurality of key points. By the curve fitting function of Catia software, connect the plurality of key points with a curve of a distinctive color (for example, red), to obtain the dorsal spine contour curve. For example, the size of the first preset distance can be set to 2% of the size of the dorsal spine specimen picture.

[0035] In which, the dorsal spine contour curve is distinguished from the layer of the dorsal spine specimen picture, so as to extract the dorsal spine contour curve later.

[0036] In some embodiments, in step S110, "extracting the contour control points of the dorsal spine contour curve to obtain a contour control point sequence" comprises: Step S1104, using the GetData coordinate calibration function, the lowest point of the two sides of the dorsal spine contour curve as the x-axis, and the vertical line of the lowest point of the dorsal spine contour curve as the y-axis, a two-dimensional coordinate system is established; Step S1105, using the GetData segmented sampling function, along the x-axis direction in the two-dimensional coordinate system, between adjacent key points, a second preset distance is extracted to extract the encryption points in the dorsal spine contour curve, and the key points and the encryption points are arranged according to the x-axis coordinate size to obtain a contour control point sequence; the second preset distance is smaller than the first preset distance.

[0037] As Figure 2 (Middle) as shown, the red dorsal spine curve is regarded as a symmetric dorsal spine curve, the lowest point of the dorsal spine contour curve is regarded as the x-axis, and the vertical line of the lowest point of the dorsal spine contour curve is regarded as the y-axis, to ensure that the length proportion of the x-axis and the y-axis is consistent with the proportion of the dorsal spine contour curve.

[0038] Taking the brown of the dorsal spine specimen picture as the background color and the red dorsal spine contour curve as the line segment, the data points are encrypted between adjacent key points in the order of the x-axis size, and the encrypted contour control point sequence is obtained. The horizontal coordinate density between any two adjacent contour control points in the contour control point sequence increases. For example, the horizontal coordinate distance between any two adjacent contour control points in the contour control point sequence is originally 0.03 times the proportion of the dorsal spine specimen picture, and after the data points are encrypted, the horizontal coordinate distance between any two adjacent contour control points in the contour control point sequence increases to 0.01 times the proportion of the dorsal spine specimen picture.

[0039] In the process of extracting the back ridge profile curve, there may be redundant and miscellaneous points due to equipment precision limitations, image noise or human operation errors. These miscellaneous points are not true reflection of the feature points of the back ridge shape of the Red-Eared Slider, but irrelevant or erroneous interference data. If retained, it will affect the authenticity of the subsequent bionic back ridge design. Therefore, the redundant miscellaneous points in the profile control points are deleted, and the profile control points after deleting the redundant miscellaneous points are stored as a profile control point sequence.

[0040] In some embodiments, in step S110, "generating a two-sided back ridge fitting curve 303 based on the profile control point sequence" comprises: Step S1106, selecting control points with positive x-axis coordinates from the profile control point sequence to obtain positive control points; Step S1107, using a first curve fitting model to optimize the distribution of the positive control points in the y-axis, fitting the positive control points to a smooth curve to obtain a right side back ridge fitting curve; Step S1108, symmetrically mapping the right side back ridge fitting curve with the y-axis as the symmetry axis to generate a left side back ridge fitting curve; the right side back ridge fitting curve and the left side back ridge fitting curve together constitute the two-sided back ridge fitting curve 303.

[0041] Since the back ridge specimen of the Red-Eared Slider may have a slight asymmetry problem, such as Figure 2 As shown in FIG. 6 (right), the control points with positive x-axis coordinates in the profile control point sequence are extracted to obtain positive control points, and the ExpGro2 model is used to fit the x-axis positive point coordinates to obtain a right side back ridge fitting curve. The fitting process is shown in formula (1): Formula (1); In formula (1), is the dependent variable, representing the fitted value of the y-coordinate of the back ridge fitting curve at the x-coordinate; is the independent variable, representing the x-coordinate of the back ridge fitting curve; is the first exponential function, is the fitting coefficient controlling the amplitude and weight of the first exponential function ; is the second exponential function; is the fitting coefficient controlling the amplitude and weight of the second exponential function ; represents the offset, and are the shape adjustment parameters of the back ridge fitting curve.

[0042] The right side dorsal spine fitting curve is symmetrically mapped to generate the left side dorsal spine fitting curve with the y-axis as the symmetric axis. The symmetric mapping is performed by flipping the coordinate sign to copy the right side dorsal spine fitting curve to the left side to obtain the left side dorsal spine fitting curve. The two side dorsal spine fitting curves are symmetric with respect to the y-axis in the two-dimensional coordinate system.

[0043] In some embodiments, in step S120, the target dorsal spine height H and the target upper end width w 1 For the control variable, scaling and shifting the two curves in the two side dorsal spine fitting curves 303 to obtain the bionic dorsal spine section that maintains the original profile of the two side dorsal spine fitting curves 303 includes: Step S1201, determining the target dorsal spine height H of the two side dorsal spine fitting curves 303; Step S1202, scaling the two curves of the two side dorsal spine fitting curves 303 on the y-axis until the height of the two curves reaches the target dorsal spine height H ; Step S1203, determining the target upper end width w 1 of the two side dorsal spine fitting curves 303; Step S1204, shifting the two curves of the two side dorsal spine fitting curves 303 in opposite directions on the x-axis until the upper end distance of the two curves is the target upper end width w 1 ; Step S1205, after scaling and shifting the two side dorsal spine fitting curves 303, the bionic dorsal spine section that maintains the original profile of the two side dorsal spine fitting curves 303 is obtained.

[0044] Figure 3 The bionic dorsal spine regulating structure is provided for the embodiment of the present application. Figure 4 The A-A cross-sectional view of the bionic dorsal spine regulating structure in Figure 3 .

[0045] As shown in Figure 4 , the dorsal spine section is set to maintain the dorsal spine profile by scaling the left and right curves of the two side dorsal spine fitting curves. The target dorsal spine height of the bionic dorsal spine section is the control variable, and the target upper end width is the shift amount of the two side dorsal spine fitting curves.

[0046] The two curves of the two side dorsal spine fitting curves are offset in opposite directions on the x-axis until the upper ends of the two curves are at the target upper end width. Among them, the two curves of the two side dorsal spine fitting curves cannot be offset to the left or to the right at the same time, but when the left side dorsal spine fitting curve is offset to the left, the right side dorsal spine fitting curve is offset to the right by the same offset amount. When the left side dorsal spine fitting curve is offset to the right, the right side dorsal spine fitting curve is offset to the left by the same offset amount. Twice the offset amount each time is the target upper end width corresponding to the upper end line 302 of the biomimetic dorsal spine section. The lower end width corresponding to the lower end line 301 of the biomimetic dorsal spine section is determined by the target dorsal spine height of the biomimetic dorsal spine section and the target upper end width obtained by offsetting.

[0047] In some embodiments, the "first dorsal spine position parameter" in step S130 includes a leading edge positioning line 203 and an axial positioning line 204; in step S130, "obtaining blade geometry data of the compressor static blade 2, fitting the blade geometry data to obtain the first dorsal spine position parameter associated with the compressor static blade 2" includes: Step S1301, obtaining static blade suction surface section data, leading edge section data and static blade chord length L ; Step S1302, based on the static blade suction surface section data, extracting the coordinate control points of the static blade suction surface section 201 to obtain a three-dimensional suction surface section control point sequence; Step S1303, based on the leading edge section data, determining the leading edge positioning line 203; Step S1304, offsetting the leading edge positioning line 203 in the negative direction of the x-axis by a third preset distance N 1 , making a parallel line of the leading edge positioning line 203 to generate the axial positioning line 204.

[0048] Figure 5 The static blade geometry diagram provided for the embodiments of the present application. Figure 6 The static blade overhead positioning profile diagram provided for the embodiments of the present application.

[0049] As Figure 5 and Figure 6 shown, the three-dimensional compressor static blade includes a static blade suction surface section 201, a static blade pressure surface section 202, a leading edge section 209 and a trailing edge section 208.

[0050] The blade geometry data of the compressor static blade includes static blade suction surface section data, leading edge section data and static blade chord length. Among them, the static blade chord length is the distance between the static blade leading edge section and the trailing edge section.

[0051] On the horizontal plane where the compressor stationary blades are located, the direction of the line connecting the leading edge to the trailing edge is taken as the positive direction of the x-axis; the direction perpendicular to the x-axis from the pressure surface to the suction surface of the stationary blade is taken as the y-axis. The vertical height direction of the compressor stationary blades is taken as the z-axis. A three-dimensional coordinate system is established based on the x-axis, y-axis, and z-axis.

[0052] After establishing a three-dimensional coordinate system based on the stationary blade, the data of the stationary blade suction surface section, the data of the stationary blade leading edge section, and the chord length of the stationary blade are obtained based on the coordinate control points of the stationary blade suction surface section, stationary blade pressure surface section, leading edge section and trailing edge section in the three-dimensional coordinate system.

[0053] The third preset distance represents the distance between the axial positioning line and the leading edge positioning line.

[0054] In some embodiments, the "second back ridge position parameter" in step S130 includes the suction surface positioning line 206, the stationary blade positioning point 207, and the deflection positioning line 205; in step S130, "determining the second back ridge position parameter based on the first back ridge position parameter, and obtaining the back ridge axial guide profile 304 based on the first back ridge position parameter and the second back ridge position parameter" includes: Step S1305: Based on the second curve fitting model, the sequence of control points of the suction surface segment is fitted to obtain the fitting formula of the suction surface positioning line 206. Step S1306, based on the leading edge positioning line 203 and the fourth preset distance N 2 Determine the starting point of the suction surface positioning line 206; Step S1307: Based on the starting point of the suction surface positioning line 206 and the fitting formula, the suction surface positioning line 206 is positioned. Step S1308: Based on the intersection of the suction surface positioning line 206 and the axial positioning line 204, determine the stationary blade positioning point 207; Step S1309: The stationary blade positioning point 207 is determined as the starting point of the axial guide profile 304 of the spine; Step S1310, based on the chord length of the stationary blade L Determine the length of the axial guide profile 304 of the spine; Step S1311: Using the stationary blade positioning point 207 as the rotation center, rotate the axial positioning line 204 by a preset deflection angle. θ The deflection positioning line 205 is obtained; Step S1312, based on the starting point of the dorsal axial guide line 304, the length of the dorsal axial guide line 304, the deflection positioning line 205 and the suction surface positioning line 206, the dorsal axial guide line 304 is determined and positioned.

[0055] Based on the static blade suction surface segment data, the coordinate control points of the static blade suction surface segment are extracted to obtain a three-dimensional suction surface segment control point sequence. The abscissa of the coordinate control points of the static blade suction surface segment is defined as the abscissa of the biomimetic dorsal axial guide line, and the ordinate of the coordinate control points of the static blade suction surface segment is defined as the ordinate of the biomimetic dorsal axial guide line.

[0056] The second curve fitting model can be an ExpDec1 model. The second curve fitting model is used to fit the static blade suction surface segment control point sequence to obtain a fitting formula of the suction surface positioning line, as shown in formula (2): Formula (2); In formula (2), Y 2 represents the ordinate of the suction surface positioning line; represents a natural exponential function term; represents the abscissa of the suction surface positioning line; t 3 represents a quantitative parameter, reflecting the speed of the exponential change of the suction surface positioning line; B 1 represents an amplitude coefficient before the exponential function; B 2 represents a constant term, representing the longitudinal offset of the suction surface positioning line.

[0057] Based on the static blade chord length, the length of the dorsal axial guide line is determined. For example, the length of the dorsal axial guide line is determined as 75% of the static blade chord length. The fourth preset distance is the distance between the suction surface positioning line and the suction surface segment.

[0058] The length of the dorsal axial guide line is determined as the biomimetic dorsal chord length. The starting point of the dorsal axial guide line is determined as the starting point of the dorsal axial guide line, the curvature of the curve where the suction surface positioning line is located as the curvature of the dorsal axial guide line, and the dorsal axial guide line is perpendicular to the deflection positioning line. According to the length of the dorsal axial guide line, the dorsal axial guide line is determined.

[0059] In some embodiments, the "third dorsal position parameter" in step S140 includes the biomimetic dorsal positioning point 305 and the lower end width w 2 ; in step S140, based on the lower end width w 2determining a third back ridge position parameter; adjusting the biomimetic back ridge section according to the second back ridge position parameter and the third back ridge position parameter, lofting the axial guide curve 304 to generate a three-dimensional biomimetic back ridge structure 3", including: Step S1401, taking the midpoint of the lower end width w2 as a biomimetic back ridge positioning point 305; w 2 Step S1402, adjusting the biomimetic back ridge section according to the biomimetic back ridge positioning point 305, the lower end width w2, the deflection positioning line 205, the stator blade positioning point 207 and the suction surface positioning line 206, lofting the axial guide curve 304 to generate a three-dimensional biomimetic back ridge structure 3. w 2 Step S1402, adjusting the biomimetic back ridge section according to the biomimetic back ridge positioning point 305, the lower end width w2, the deflection positioning line 205, the stator blade positioning point 207 and the suction surface positioning line 206, lofting the axial guide curve 304 to generate a three-dimensional biomimetic back ridge structure 3.

[0060] In some embodiments, in step S1402, "adjusting the biomimetic back ridge section according to the biomimetic back ridge positioning point 305, the lower end width w2, the deflection positioning line 205, the stator blade positioning point 207 and the suction surface positioning line 206", includes: w 2 coinciding the biomimetic back ridge positioning point 305 with the stator blade positioning point 207; coinciding the lower end width w2 with the deflection positioning line 205; and making the biomimetic back ridge section perpendicular to the plane on which the deflection positioning line 205 and the suction surface positioning line 206 lie.

[0061] In some embodiments, in step S140, "integrating the three-dimensional biomimetic back ridge structure 3 as a compressor flow channel regulating component into the compressor flow channel 1", includes: Step S1403, adjusting the target back ridge height h, the target upper end width w1, the first back ridge position parameter and the second back ridge position parameter to obtain different three-dimensional biomimetic back ridge structures 3; H w 1 Step S1403, adjusting the target back ridge height h, the target upper end width w1, the first back ridge position parameter and the second back ridge position parameter to obtain different three-dimensional biomimetic back ridge structures 3; Step S1404, integrating the different three-dimensional biomimetic back ridge structures 3 as compressor flow channel regulating components into the wall end of the compressor flow channel 1.

[0062] The first back ridge position parameter includes a leading edge positioning line and an axial positioning line. The second back ridge position parameter includes a suction surface positioning line, a stator blade positioning point and a deflection positioning line.

[0063] ​​​by changing the distance between the axial positioning line and the leading edge positioning line in the first back ridge position parameter, changing the deflection angle between the suction surface positioning line and the deflection positioning line in the second back ridge position parameter, changing the distance between the suction surface positioning line and the suction surface section, and changing the position of the static blade positioning point to change the three-dimensional biomimetic back ridge chord length L b to obtain different three-dimensional biomimetic back ridge structures.

[0064] Figure 7 A compressor flow passage geometry schematic diagram is provided for the embodiments of the present application. Figure 8 A Figure 7 B-B cross-sectional view of the intermediate pressure compressor flow passage. Figure 9 A Figure 7 C-C cross-sectional view of the intermediate pressure compressor flow passage.

[0065] As Figures 7 to 9 shown, due to the significant pressure gradient change of the compressor flow passage from the inlet to the outlet, and the different flow separation intensities of the static blade suction surface at different chord length positions. Therefore, different three-dimensional biomimetic back ridge structures are constructed, which are integrated at different positions of the compressor flow passage wall end as compressor flow passage regulating components, and can accurately regulate the local flow characteristics in the flow passage to maximize the suppression of flow separation and improve aerodynamic efficiency.

[0066] Figure 10 An outlet total pressure loss coefficient along the dimensionless blade height distribution diagram is provided for the embodiments of the present application. As Figure 10 shown, in some embodiments, a three-dimensional biomimetic back ridge structure is arranged in the end region flow passage of the high-speed high-load compressor cascade studied, for example, the distance between the axial positioning line and the leading edge positioning line is set to 30 mm, and the distance between the suction surface positioning line and the suction surface section is set to 5 mm. Numerical simulation is performed on the three-dimensional compressor original geometry and the compressor flow passage geometry with three-dimensional biomimetic back ridge geometry of the present embodiment by using computational fluid dynamics method, and the comparison of the total pressure loss coefficient along the dimensionless blade height distribution diagram of the outlet cross section (0.4 chord length after the blade trailing edge) shows that the three-dimensional biomimetic back ridge structure designed by using the compressor flow passage regulating component design method based on biomimetic back ridge of the present application has significant beneficial effects on the end region of the flow passage, significantly improves the total pressure loss of the end region of the flow passage, although the loss increases in the middle section of the blade, but under the blocking, inducing and guiding effect of the three-dimensional biomimetic back ridge structure, it shows significant positive gain, significantly suppresses the expansion of the secondary flow, and improves the flow capacity of the blade passage.

[0067] In addition, the beneficial effects of the present application are embodied in (1) a modeling method for effectively extracting a biomimetic structure shape is presented, which provides new ideas for modeling and application of various biomimetic structures in other fields, and can quickly verify the effectiveness of other biomimetic structures. (2) For the problem of secondary flow in the internal flow passage of the high-load compressor due to the transverse pressure gradient of the end wall of the internal flow passage, the quantitative and positioning quantitative method of the three-dimensional biomimetic ridge structure is provided, which provides a systematic research method for the arrangement position and overall structure change of the three-dimensional biomimetic ridge structure, and improves the operation efficiency of the high-load compressor. (3) The first ridge position parameter and the second ridge position parameter provide rapid positioning for the subsequent biomimetic ridge in the high-load compressor end wall multi-position verification, make up for the deficiency of the new generation of high-load compressors in end wall separation regulation, and have important engineering application prospect.

[0068] It should be pointed out here that the description of the above device embodiments is similar to the description of the above method embodiments, and has similar beneficial effects as the method embodiments. For technical details not disclosed in the system embodiments of the present application, please refer to the description of the method embodiments of the present application for understanding.

[0069] It should be pointed out here that the description of the above device embodiments is similar to the description of the above method embodiments, and has similar beneficial effects as the method embodiments. For technical details not disclosed in the system embodiments of the present application, please refer to the description of the method embodiments of the present application for understanding.

[0070] Correspondingly, the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the biomimetic ridge based compressor flow passage regulating component design method in any of the above embodiments. Correspondingly, the present application also provides a computer program product, which is used to implement the steps of the biomimetic ridge based compressor flow passage regulating component design method in any of the above embodiments when the computer program product is executed by a processor of an electronic device.

[0071] It should be understood that every feature, structure, or characteristic described herein is within a preferred embodiment of the present application. It should be noted that the foregoing embodiments are merely exemplary and are not to be construed as limiting the present application. It should also be noted that features described in the foregoing relate to both structural and method aspects of the application. Accordingly, the terminology in use has a broad meaning from the context of use. It should be understood that the terms "comprises", "comprising", "includes", "including" or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0072] It should be noted that, as used in this document, the terms "comprises", "comprising", "includes", "including", or the like, are used in the sense of "including but not limited to", and not in the sense of "consisting only of the listed items". The term "coupled" as used herein is intended to mean physically, logically, or communicatively coupled or connected.

[0073] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The above-described device embodiments are only illustrative, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed components can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0074] The units described above as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units; they can be located in one place or distributed on multiple network units; some or all of the units can be selected according to actual needs to achieve the purpose of the embodiments of the present application. In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be realized in the form of hardware or hardware plus software functional unit.

[0075] Alternatively, the above-mentioned integrated units of the present application, if realized in the form of software function modules and sold or used as independent products, can also be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions for causing the device automatic test line to execute all or part of the methods described in the embodiments of the present application. The foregoing storage medium includes mobile storage devices, ROM, magnetic discs or optical discs and various media that can store program codes.

[0076] The methods disclosed in the several method embodiments provided by the present application can be combined arbitrarily without conflict to obtain new method embodiments. The features disclosed in the several method or device embodiments provided by the present application can be combined arbitrarily without conflict to obtain new method embodiments or device embodiments.

[0077] The above is only an implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for designing a control component of a compressor passage based on a biomimetic dorsal spine, characterized in that, The method comprises the following steps: a specimen picture of a carapace of a soft-shelled turtle is obtained, and a carapace contour curve is extracted from the specimen picture; contour control points of the carapace contour curve are extracted to obtain a contour control point sequence; based on the contour control point sequence, two-side carapace fitting curves are generated; target carapace height and target upper end width are taken as control variables, and two curves in the two-side carapace fitting curves are scaled and offset to obtain a biomimetic carapace section that maintains an original profile of the two-side carapace fitting curves, and a lower end width of the biomimetic carapace section is determined based on the target carapace height, the target upper end width and the shape of the original profile; blade geometry data of a compressor static blade are obtained, and the blade geometry data are fitted to obtain first carapace position parameters associated with the compressor static blade; second carapace position parameters are determined based on the first carapace position parameters, and a carapace axial guide profile is obtained based on the first carapace position parameters and the second carapace position parameters; third carapace position parameters are determined based on the lower end width, and after the biomimetic carapace section is adjusted in position and posture according to the second carapace position parameters and the third carapace position parameters, the biomimetic carapace section is lofted along the carapace axial guide profile to generate a three-dimensional biomimetic carapace structure; and the three-dimensional biomimetic carapace structure is integrated into a compressor flow channel as a compressor flow channel regulating component.

2. The method of claim 1, wherein, The carapace contour curve is extracted from the specimen picture, which comprises the following steps: the specimen picture is imported into Catia software; a key point adding function of the Catia software is used to add a key point every first preset distance along a ridge line profile of the carapace of the soft-shelled turtle in the specimen picture to obtain a plurality of key points; a curve fitting function of the Catia software is used to connect the plurality of key points in sequence with a curve to obtain a carapace contour curve.

3. The method of claim 2, wherein, The contour control points of the carapace contour curve are extracted to obtain a contour control point sequence, which comprises the following steps: a coordinate calibration function of GetData is used to take a line connecting the lowest points of two curves of the carapace contour curve as an x-axis, take a perpendicular line of the lowest point connecting line passing through an apex of the carapace contour curve as a y-axis, and establish a two-dimensional coordinate system; a segmented sampling function of GetData is used to extract encrypted points in the carapace contour curve every second preset distance between adjacent key points along the x-axis direction in the two-dimensional coordinate system, and the key points and the encrypted points are arranged according to the x-axis coordinate size to obtain a contour control point sequence; the second preset distance is smaller than the first preset distance.

4. The method of claim 3, wherein, The two-side carapace fitting curves are generated based on the contour control point sequence, which comprises the following steps: control points with positive x-axis coordinates are selected from the contour control point sequence to obtain positive control points; a first curve fitting model is used to optimize the distribution of the positive control points in the y-axis, fit the positive control points to a smooth curve, and obtain a right-side carapace fitting curve; the right-side carapace fitting curve is symmetrically mapped with the y-axis as the axis of symmetry to generate a left-side carapace fitting curve; The right side dorsal spine fitting curve and the left side dorsal spine fitting curve together constitute two side dorsal spine fitting curves.

5. The method of claim 4, wherein, The two curves in the two side dorsal spine fitting curves are scaled and offset with the target dorsal spine height and the target upper end width as control variables to obtain a bionic dorsal spine section that maintains the original profile of the two side dorsal spine fitting curves, including: determining a target dorsal spine height of the two side dorsal spine fitting curves; scaling the two curves of the two side dorsal spine fitting curves on the y-axis until the height of the two curves reaches the target dorsal spine height; determining a target upper end width of the two side dorsal spine fitting curves; offsetting the two curves of the two side dorsal spine fitting curves in opposite directions on the x-axis until the upper end distance of the two curves is the target upper end width; scaling and offsetting the two side dorsal spine fitting curves to obtain a bionic dorsal spine section that maintains the original profile of the two side dorsal spine fitting curves.

6. The method of claim 1, wherein, The first dorsal spine position parameter includes a leading edge positioning line and an axial positioning line; the blade geometry data of the compressor static blade is obtained, and the first dorsal spine position parameter associated with the compressor static blade is obtained by fitting the blade geometry data, including: obtaining static blade suction surface segment data, leading edge segment data and static blade chord length; based on the static blade suction surface segment data, extracting the coordinate control points of the static blade suction surface segment to obtain a three-dimensional suction surface segment control point sequence; based on the leading edge segment data, determining a leading edge positioning line; at a third preset distance offset from the leading edge positioning line in the negative direction of the x-axis, a parallel line of the leading edge positioning line is drawn to generate an axial positioning line.

7. The method of claim 6, wherein, The second dorsal spine position parameter includes a suction surface positioning line, a static blade positioning point and a deflection positioning line; the second dorsal spine position parameter is determined based on the first dorsal spine position parameter, and a dorsal spine axial guide profile is obtained based on the first dorsal spine position parameter and the second dorsal spine position parameter, including: based on a second curve fitting model, fitting the suction surface segment control point sequence to obtain a fitting formula of the suction surface positioning line; based on the leading edge positioning line and a fourth preset distance, determining the starting point of the suction surface positioning line; based on the starting point of the suction surface positioning line and the fitting formula, positioning the suction surface positioning line; based on the intersection of the suction surface positioning line and the axial positioning line, determining a static blade positioning point; determining the static blade positioning point as the starting point of the dorsal spine axial guide profile; based on the static blade chord length, determining the length of the dorsal spine axial guide profile; taking the static blade positioning point as the center of rotation, rotating the axial positioning line by a preset deflection angle to obtain a deflection positioning line; based on the starting point of the dorsal spine axial guide profile, the length of the dorsal spine axial guide profile, the deflection positioning line and the suction surface positioning line, positioning the dorsal spine axial guide profile.

8. The method of claim 7, wherein, The third back ridge position parameter comprises a biomimetic back ridge positioning point and the lower end width; the third back ridge position parameter is determined based on the lower end width; after adjusting the position and posture of the biomimetic back ridge section according to the second back ridge position parameter and the third back ridge position parameter, lofting is performed along the back ridge axial guide curve to generate a three-dimensional biomimetic back ridge structure, comprising: The midpoint of the lower end width is taken as the biomimetic back ridge positioning point; After adjusting the position and posture of the biomimetic back ridge section according to the biomimetic back ridge positioning point, the lower end width, the deflection positioning line, the stationary blade positioning point and the suction surface positioning line, lofting is performed along the back ridge axial guide curve to generate a three-dimensional biomimetic back ridge structure.

9. The method of claim 8, wherein, The adjusting of the position and posture of the biomimetic back ridge section according to the biomimetic back ridge positioning point, the lower end width, the deflection positioning line, the stationary blade positioning point and the suction surface positioning line comprises: The biomimetic back ridge positioning point is coincided with the stationary blade positioning point; The lower end width is coincided with the deflection positioning line; The biomimetic back ridge section is perpendicular to the plane where the deflection positioning line and the suction surface positioning line are located.

10. The method of claim 1, wherein, The three-dimensional biomimetic back ridge structure is integrated in the compressor flow channel as a compressor flow channel regulation component, comprising: Different three-dimensional biomimetic back ridge structures are obtained by adjusting the target back ridge height, the target upper end width, the first back ridge position parameter and the second back ridge position parameter; The different three-dimensional biomimetic back ridge structures are integrated in the compressor flow channel wall end as compressor flow channel regulation components.

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