Volute support plate design method, volute support plate, centrifugal compressor and storage medium

Abstract

The application relates to the technical field of aero-engine components, and discloses a volute support plate design method, a volute support plate, a centrifugal compressor and a storage medium, wherein the volute support plate design method comprises the following steps: obtaining a radial diffuser blade profile of the centrifugal compressor by superimposing a thickness distribution on a mean camber line, and superimposing a thickness distribution of thinning on the radial diffuser blade profile; cutting an inlet section of the radial diffuser blade profile after thinning according to the length of the volute support plate required by calculation, and forming a preliminary volute support plate from a remaining outlet section; and cutting a three-point Bezier curve from a blade basin tail edge section of the preliminary volute support plate to obtain the volute support plate. The volute support plate design method provided by the application generates a preliminary volute support plate by superimposing a thickness of thinning on a mean camber line of a radial diffuser blade profile, and cuts a Bezier curve from a blade basin tail edge section, so that inverted steps can be effectively avoided when the volute support plate is assembled with the radial diffuser, and total pressure loss and wake loss are reduced.

Description

Technical Field

[0001] This invention relates to the field of aero-engine component technology, specifically to a volute support plate design method, a volute support plate, a centrifugal compressor, and a storage medium. Background Technology

[0002] Centrifugal compressors are used in aero engines and have advantages such as small size, light weight, simple structure, good rotor rigidity, and good maintainability. The volute is used to collect gas downstream of the radial diffuser or the centrifugal impeller of the centrifugal compressor and can guide the gas to the pipeline.

[0003] As the requirements for weight reduction in centrifugal compressors continue to increase, the wall thickness of the volute is constantly being reduced during the design process. However, after the wall thickness is reduced, the volute is prone to deformation due to the effects of high temperature (usually exceeding 200 degrees Celsius) and high pressure (generally not less than 4 atmospheres).

[0004] To prevent volute deformation, volute supports are typically designed to provide load-bearing and airflow guidance. These supports significantly impact the total pressure loss of the volute, the bleed air pressure of the centrifugal compressor, and the bleed air temperature. The volute is usually cast or 3D printed. Existing volute supports are limited by machining and manufacturing capabilities, resulting in significant machining errors. When assembling the volute support with the radial diffuser, some connection areas are higher than others, easily forming inverted steps, leading to a larger total pressure loss and a greater wake loss from the volute support. Summary of the Invention

[0005] In view of this, the present invention provides a design method for a volute support plate, a volute support plate, a centrifugal compressor, and a storage medium to solve the problem that the assembly of the volute support plate and the radial diffuser has an inverted step, resulting in a large total pressure loss and a large wake loss of the volute support plate.

[0006] In a first aspect, the present invention provides a method for designing a volute support plate, comprising the following steps:

[0007] The radial diffuser blade profile of the centrifugal compressor is obtained by superimposing the thickness distribution of the mid-arc line, and the thinned thickness distribution is superimposed on the radial diffuser blade profile.

[0008] Based on the calculated required volute support plate length, the inlet section of the thinned radial diffuser blade is cut, and the remaining outlet section forms the preliminary volute support plate.

[0009] The three-point Bézier curve is cut from the trailing edge of the blade basin of the preliminary volute support plate to obtain the volute support plate.

[0010] Beneficial effects: The volute support plate provided by the present invention generates a preliminary volute support plate by superimposing the thickness distribution of the mid-arc line of the radial diffuser blade and cutting the inlet section of the thinned radial diffuser blade. A Bezier curve is cut into the blade head trailing edge section of the preliminary volute support plate, which can effectively avoid the occurrence of inverted steps when the volute support plate is assembled with the radial diffuser, and reduce the total pressure loss and wake loss.

[0011] In one optional embodiment, the radial diffuser airfoil of the centrifugal compressor is obtained by superimposing a thickness distribution along a mid-arc line, and the step of superimposing a thinned thickness distribution onto the radial diffuser airfoil includes:

[0012] Based on the dimensional tolerances of the radial diffuser and the dimensional tolerances of the volute support plate, the half-thickness distribution of the outlet section of the thinned radial diffuser blade profile is calculated.

[0013] Beneficial effects: By controlling the dimensional tolerances of the radial diffuser and the volute support plate, the half-thickness distribution of the outlet section of the radial diffuser blade can be calculated, which can achieve a perfect connection between the volute support plate and the radial diffuser and improve the aerodynamic performance of the volute support plate.

[0014] In one alternative embodiment, the radial diffuser airfoil profile tolerance is ±0.5 mm, and the volute support airfoil profile profile and position tolerance are ±0.35 mm.

[0015] Beneficial effects: This invention takes into account the tolerances of the radial diffuser airfoil profile, the profile of the volute support plate, and the positional tolerances, which can accurately obtain the thinned radial diffuser airfoil profile and improve the accuracy of the volute support plate dimensions.

[0016] In one alternative implementation, the outlet section half-thickness of the radial diffuser blade is reduced by 0.4 mm.

[0017] Beneficial effect: Based on the tolerances of the radial diffuser airfoil profile, the profile and position tolerances of the volute support plate, the half thickness of the radial diffuser outlet section can be accurately calculated.

[0018] In one alternative implementation, the mid-arc line is the line connecting the center of the inscribed circle formed by the blade base and blade back of the radial diffuser blade, and the half-thickness is the radius of the inscribed circle.

[0019] Beneficial effect: The middle arc is the line connecting the center of the inscribed circle formed by the blade base and blade back of the radial diffuser blade profile. The half thickness is the radius of the inscribed circle. The middle arc can be used to adjust the outlet section size of the radial diffuser blade profile and convert it into the size of the volute support plate in order to obtain the volute support plate.

[0020] In one alternative embodiment, the initial volute support plate has a near-quadrilateral structure, and a three-point Bézier curve is cut at the corner of the inlet section of the initial volute support plate away from the radial diffuser blade.

[0021] Beneficial effects: The present invention cuts a three-point Bézier curve at the corner of the inlet section of the initial volute support plate away from the radial diffuser blade profile. The smoothness of the Bézier curve can be used to effectively avoid the inverted step that occurs when assembling the volute support plate and the radial diffuser.

[0022] In one alternative embodiment, the step of cutting the inlet section of the thinned radial diffuser blade according to the calculated required volute support plate length, and forming the preliminary volute support plate from the remaining outlet section, includes:

[0023] The length of the volute support plate is calculated based on the structure of the volute and radial diffuser, and the length of the remaining outlet section is greater than or equal to the calculated length of the volute support plate.

[0024] Beneficial effect: By calculating the length of the volute support plate based on the structure of the volute and radial diffuser, the length of the remaining outlet section is greater than or equal to the calculated length of the volute support plate, which can accurately obtain the length of the volute support plate that needs to be designed, so as to facilitate cutting.

[0025] Secondly, the present invention also provides a volute support plate, which is manufactured using the above-described volute support plate design method.

[0026] Beneficial effects: Because the volute support plate is made using the above-mentioned volute support plate design method, it has the same technical effect, namely, by superimposing the thickness distribution of the radial diffuser blade profile with the mid-arc line and cutting the inlet section of the thinned radial diffuser blade profile to generate the preliminary volute support plate, and cutting the Bezier curve on the blade head trailing edge section of the preliminary volute support plate, it can effectively avoid the occurrence of inverted steps when the volute support plate is assembled with the radial diffuser, and reduce the total pressure loss and wake loss.

[0027] Thirdly, the present invention also provides a centrifugal compressor, comprising:

[0028] Snail shell;

[0029] Radial diffuser;

[0030] A centrifugal impeller is connected to one end of a radial diffuser;

[0031] The volute support plate is manufactured using the aforementioned volute support plate design method. The volute is suitable for connection to the opposite end of the radial diffuser via the volute support plate.

[0032] Beneficial Effects: The centrifugal compressor provided by this invention includes the aforementioned volute support plate, achieving the same technical effects as the volute support plate. Specifically, by superimposing a thinned thickness distribution on the mid-arc line of the radial diffuser airfoil and cutting the inlet section of the thinned radial diffuser airfoil, a preliminary volute support plate is generated. A Bézier curve is then cut into the trailing edge section of the blade basin of the preliminary volute support plate, effectively preventing inverted steps during assembly with the radial diffuser and reducing total pressure loss and wake loss. Furthermore, it significantly improves the pressure ratio and efficiency of the centrifugal compressor.

[0033] Fourthly, the present invention also provides a non-transitory computer-readable storage medium that stores computer instructions for causing a computer to execute the above-described volute support plate design method.

[0034] Beneficial effects: The non-transitory computer-readable storage medium provided by the present invention provides computer instructions for causing a computer to execute the above-described volute support plate design method, and has the same technical effects as the volute support plate design method, which will not be elaborated here. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a flowchart illustrating a volute support plate design method according to an embodiment of the present invention.

[0037] Figure 2 This is a comparative schematic diagram of the radial diffuser blade profile before and after thinning according to an embodiment of the present invention;

[0038] Figure 3 This is a line graph showing the half-thickness comparison of the radial diffuser blade profile before and after thinning, according to an embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram of the blade head and blade back of the radial diffuser blade according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of a trimmed radial diffuser blade profile according to an embodiment of the present invention;

[0041] Figure 6 This is a cross-sectional view of the volute support plate according to an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the volute support plate according to an embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram showing the connection relationship between the volute and the volute support plate in an embodiment of the present invention.

[0044] Figure 9 This is a schematic diagram showing the connection relationship between the radial diffuser housing and the volute support plate in an embodiment of the present invention.

[0045] Figure 10 This is a schematic diagram of a centrifugal compressor according to an embodiment of the present invention;

[0046] Figure 11 This is a line graph comparing the pressure ratio of the volute support plate of this invention with that of the prior art volute support plate;

[0047] Figure 12 This is a line graph comparing the efficiency of the volute support plate of this invention with that of the prior art volute support plate.

[0048] Explanation of reference numerals in the attached figures:

[0049] Existing technology: 1', Radial diffuser.

[0050] This application includes: 1. Radial diffuser; 101. Inlet section; 102. Outlet section; 103. Blade cup; 104. Blade back; 2. Volute support plate; 3. Volute; 4. Centrifugal impeller. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] To address the issue of inverted steps during the assembly of the volute support plate and the radial diffuser, resulting in significant total pressure loss and wake loss, this invention addresses this problem. The volute support plate is initially formed by thinning the thickness of the radial diffuser airfoil using the mid-arc line superimposed on it. A Bezier curve is then formed at the trailing edge of the blade head of this initial volute support plate. This effectively avoids inverted steps during the assembly of the volute support plate and the radial diffuser, reducing both total pressure loss and wake loss.

[0053] The following is combined Figures 1 to 12 The following describes embodiments of the present invention.

[0054] According to an embodiment of the present invention, in one aspect, such as Figure 1 As shown, a method for designing a volute support plate is provided, including the following steps:

[0055] S100: The radial diffuser blade profile of the centrifugal compressor is obtained by superimposing the thickness distribution of the mid-arc line, and the thinned thickness distribution is superimposed on the radial diffuser blade profile.

[0056] S200: Based on the calculated required length of the volute support plate 2, the inlet section 101 of the thinned radial diffuser blade is cut, and the remaining outlet section 102 forms the preliminary volute support plate.

[0057] S300: Cut the trailing edge section of the blade basin 103 of the preliminary volute support plate into a three-point Bézier curve to obtain the volute support plate 2.

[0058] The volute support plate 2 provided in this embodiment of the invention generates a preliminary volute support plate by superimposing a thinned thickness distribution on the mid-arc line of the radial diffuser blade and cutting the inlet section 101 of the thinned radial diffuser blade. A Bezier curve is cut into the trailing edge section of the blade head 103 of the preliminary volute support plate, which can effectively avoid the occurrence of inverted steps when the volute support plate 2 is assembled with the radial diffuser 1, reduce the total pressure loss and wake loss, and improve the aerodynamic performance of the volute support plate 2.

[0059] In addition, the embodiments of the present invention take into account the impact of processing and assembly on the flow path components of the centrifugal compressor, making the aerodynamic design highly robust.

[0060] In one embodiment, S100: The step of obtaining the radial diffuser airfoil of the centrifugal compressor by superimposing the thickness distribution through the mid-arc line, and superimposing the thinned thickness distribution on the radial diffuser airfoil includes:

[0061] Based on the dimensional tolerances of the radial diffuser 1 and the dimensional tolerances of the volute support plate 2, the half-thickness distribution of the outlet section 102 of the thinned radial diffuser blade is calculated.

[0062] By controlling the dimensional tolerances of the radial diffuser 1 and the volute support plate 2, the half-thickness distribution of the outlet section 102 of the radial diffuser blade can be calculated, thereby achieving accurate connection between the volute support plate 2 and the radial diffuser 1 and improving the aerodynamic performance of the volute support plate 2.

[0063] Specifically, the radial diffuser airfoil of the centrifugal compressor is obtained by superimposing the thickness distribution along the mid-arc line, such as... Figure 2 As shown by L in the figure. The thinned radial diffuser blade profile is as follows. Figure 2 As shown in M.

[0064] For example, the tolerance of the radial diffuser airfoil is ±0.5 mm, and the tolerances of the volute support airfoil profile profile and position are ±0.35 mm. The half-thickness of the outlet section 102 of the radial diffuser airfoil is reduced by 0.4 mm. The reduction dimension of the half-thickness of the outlet section 102 of the radial diffuser airfoil is as follows. Figure 3 The line segment H is shown in the diagram.

[0065] This embodiment of the invention considers the tolerances of the radial diffuser airfoil profile, the profile tolerance of the volute support plate, and the position tolerance to accurately obtain the thinned radial diffuser airfoil profile, thereby improving the accuracy of the dimensions of the volute support plate 2. Based on the tolerances of the radial diffuser airfoil profile, the profile tolerance of the volute support plate, and the position tolerance, the half-thickness of the outlet section 102 of the radial diffuser airfoil can be accurately calculated.

[0066] Further, in one embodiment, the mid-arc line is the line connecting the centers of the inscribed circles formed by the blade base 103 and the blade back 104 of the radial diffuser blade profile, and the half-thickness is the radius of the inscribed circle. The radius of the inscribed circle is as follows: Figure 4 As shown by R in the diagram. The arc is the line connecting the centers of the inscribed circles formed by the blade base 103 and the blade back 104 of the radial diffuser 1, as shown in the diagram. Figure 4 The line segment O is shown in the figure. The half-thickness is the radius of the inscribed circle, which can be used to adjust the size of the outlet section 102 of the radial diffuser blade profile and convert it into the size of the volute support plate 2 in order to obtain the volute support plate 2.

[0067] In one embodiment, such as Figures 5 to 7 As shown, the initial volute support plate has a quadrilateral structure, and a three-point Bézier curve is cut at the corner of the inlet section 101 of the initial volute support plate away from the diffuser blade.

[0068] The present invention cuts a three-point Bézier curve at the corner of the inlet section 101 of the initial volute support plate away from the diffuser blade. The smoothness of the Bézier curve can be used to effectively avoid the inverted step that occurs when the volute support plate 2 is assembled with the radial diffuser 1.

[0069] Specifically, such as Figure 6 As shown, line segment AF is the inlet section of volute support plate 2, and line segment CE is the outlet section of volute support plate 2. Line segments BC and CD represent the trailing edge of the blade head 103 of the radial diffuser airfoil, where a three-point Bézier curve is cut. CD = 1am * CE, where 1am is the preset value of CD / CE, which can be selected and set according to actual needs, and BC = CD. The starting point of line segment BC is tangent to curve AB at point B, and points C, D, and E lie on the same straight line.

[0070] In one embodiment, such as Figure 5 As shown, S200: The steps of cutting and thinning the inlet section 101 of the radial diffuser blade according to the calculated required length of the volute support plate 2, and forming the preliminary volute support plate from the remaining outlet section 102, include:

[0071] The length of the volute support plate 2 is calculated based on the structure of the volute 3 and the radial diffuser 1. The length of the remaining outlet section 102 is greater than or equal to the calculated length of the volute support plate 2. This allows for the precise determination of the required length of the volute support plate 2 for cutting.

[0072] According to an embodiment of the present invention, in a second aspect, a volute support plate is also provided, which is manufactured using the volute support plate design method described above.

[0073] Because the volute support plate 2 is made using the above-mentioned volute support plate design method, it has the same technical effect. That is, by superimposing the thickness distribution of the radial diffuser blade profile with the mid-arc line and cutting the inlet section 101 of the thinned radial diffuser blade profile, a preliminary volute support plate is generated. A Bezier curve is cut into the trailing edge section of the blade basin 103 of the preliminary volute support plate, which can effectively avoid the occurrence of inverted steps when the volute support plate 2 is assembled with the radial diffuser 1, and reduce the total pressure loss and wake loss.

[0074] According to an embodiment of the present invention, a third aspect, such as Figures 8 to 10 As shown, a centrifugal compressor is also provided, mainly comprising: a volute 3, a radial diffuser 1, a centrifugal impeller 4, and a volute support plate 2. The centrifugal impeller 4 is connected to one end of the radial diffuser 1. The volute support plate 2 is manufactured using the aforementioned volute support plate design method. The volute 3 is adapted to be connected to the opposite end of the radial diffuser 1 via the volute support plate 2.

[0075] Specifically, the volute support plate 2 is located downstream of the radial diffuser 1 and at the inlet of the volute 3.

[0076] The centrifugal compressor provided by the present invention includes the aforementioned volute support plate 2, which has the same technical effect as the volute support plate 2. That is, by superimposing the thickness distribution of the radial diffuser blade profile with the mid-arc line and cutting the inlet section 101 of the thinned radial diffuser blade profile, a preliminary volute support plate is generated. A Bezier curve is cut into the trailing edge section of the blade head 103 of the preliminary volute support plate, which can effectively avoid the occurrence of inverted steps when the volute support plate 2 is assembled with the radial diffuser 1, and reduce the total pressure loss and wake loss.

[0077] In addition, such as Figure 11 and Figure 12 As shown, the centrifugal compressor provided in this embodiment of the invention, due to the use of the volute support plate 2 manufactured by the above-described volute support plate design method, significantly improves the pressure ratio and operating efficiency of the centrifugal compressor compared to the existing volute support plate 2. Specifically, the pressure ratio of the centrifugal compressor is increased by approximately 0.7%, and the operating efficiency is increased by approximately 0.6%.

[0078] To achieve the basic functions of a centrifugal compressor, the centrifugal compressor in this embodiment may also include other necessary modules or components, such as an air inlet and a housing. It should be noted that any suitable existing construction can be selected for these other necessary modules or components. To clearly and concisely illustrate the technical solution provided in this embodiment, the above-mentioned parts will not be repeated here, and the accompanying drawings have also been simplified accordingly. However, it should be understood that the scope of the embodiments of the present invention is not limited thereto.

[0079] According to an embodiment of the present invention, in a fourth aspect, a non-transitory computer-readable storage medium is also provided, the non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the above-described volute support plate design method.

[0080] The non-transitory computer-readable storage medium provided by this invention contains computer instructions for causing a computer to execute the above-described volute support plate design method, and has the same technical effects as the volute support plate design method, which will not be described in detail here.

[0081] Specifically, the storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0082] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for designing a volute support plate, characterized in that, Includes the following steps: The radial diffuser blade profile of the centrifugal compressor is obtained by superimposing the thickness distribution along the mid-arc line, and the thinned thickness distribution is then superimposed on the radial diffuser blade profile. According to the calculated length of the volute support plate (2), the inlet section (101) of the radial diffuser blade is cut and the remaining outlet section (102) is used to form the preliminary volute support plate. Three-point Bézier curves were cut from the trailing edge of the blade basin (103) of the preliminary volute support plate to obtain the volute support plate (2). The step of obtaining the radial diffuser blade profile of the centrifugal compressor by superimposing the thickness distribution through the mid-arc line, and then superimposing the thinned thickness portion of the radial diffuser blade profile includes: Based on the tolerances of the radial diffuser airfoil and the tolerances of the profile and position of the volute support plate airfoil, the half-thickness distribution of the outlet section (102) of the thinned radial diffuser airfoil is calculated.

2. The volute support plate design method according to claim 1, characterized in that, The tolerance of the radial diffuser airfoil is ±0.5 mm, and the tolerance of the volute support airfoil profile and position is ±0.35 mm.

3. The volute support plate design method according to claim 2, characterized in that, The half-thickness of the outlet section (102) of the radial diffuser blade is reduced by 0.4 mm.

4. The volute support plate design method according to claim 1, characterized in that, The mid-arc line is the line connecting the center of the inscribed circle formed by the blade base (103) and the blade back (104) of the radial diffuser blade, and the half-thickness is the radius of the inscribed circle.

5. The volute support plate design method according to claim 1, characterized in that, The preliminary volute support plate has a quadrilateral-like structure, and a three-point Bézier curve is cut out at the corner of the inlet section (101) of the radial diffuser blade.

6. The volute support plate design method according to claim 1, characterized in that, The steps of cutting the inlet section (101) of the radial diffuser blade after thinning, based on the calculated required length of the volute support plate (2), and forming the preliminary volute support plate from the remaining outlet section (102), include: The length of the volute support plate (2) is calculated based on the structure of the volute (3) and the radial diffuser (1). The length of the remaining outlet section (102) is greater than or equal to the calculated length of the volute support plate (2).

7. A volute support plate, characterized in that, The volute support plate is manufactured using the volute support plate design method according to any one of claims 1 to 6.

8. A centrifugal compressor, characterized in that, include: worm shell (3); Radial diffuser (1); Centrifugal impeller (4) is connected to one end of the radial diffuser (1); The volute support plate (2) is manufactured using the volute support plate design method according to any one of claims 1 to 6, and the volute (3) is adapted to be connected to the opposite end of the radial diffuser (1) via the volute support plate (2).

9. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions for causing a computer to execute the volute support plate design method according to any one of claims 1 to 6.

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