Egg-shaped circulating circle design method and structure based on arc connecting lines
By adopting a design method based on circular arc connecting lines, the problem of concave circular streamline in hydraulic torque converters was solved, achieving more efficient fluid circulation and improving transmission efficiency.
Patent Information
- Application Number
- CN202511347867.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-19
- Publication Date
- 2026-01-20
AI Technical Summary
In the prior art, the design of the circulation circle of the hydraulic torque converter uses a combination of circular arcs and straight lines, resulting in concave lines in the outer and inner circulation circles, which affects the efficiency of fluid circulation.
An egg-shaped circular design method based on circular arc connecting lines is adopted. The connecting arc segment where the upper and lower circular arcs of the middle streamline are tangent is designed through calculation and geometric model. The outer and inner circular streamlines are designed in combination with one-dimensional beam theory.
It improves the smoothness of the circulation circle of the hydraulic torque converter, avoids the efficiency drop during fluid circulation, and improves the transmission efficiency.
Smart Images
Figure CN121365475A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of hydrodynamic torque converter circulation circle design, in particular to an egg-shaped circulation circle design method and structure based on an arc connecting line. BACKGROUND
[0002] The configuration design of the hydrodynamic torque converter circulation circle is a core technical link of the torque converter research and development, and its geometric form directly affects the performance parameters and working characteristics of the torque converter. According to the geometric characteristics of the circulation circle cross section, it can be divided into four basic types of circle, ellipse, egg shape and rectangle, among which the egg-shaped circulation circle has significant application value in heavy engineering machinery transmission system due to its high axial space utilization rate.
[0003] In the design method of the egg-shaped circulation circle, a parameterized modeling strategy based on a design streamline is adopted: first, a core design streamline is constructed, and then the outer ring streamline and the inner ring streamline are generated according to the geometric characteristic parameters of the circulation circle. Compared with the traditional arc splicing design method, this technical route directly optimizes the design streamline, avoiding the complex iteration and correction process of the flow cross section, thereby significantly improving the design efficiency and parameterization degree. This streamline-driven design paradigm provides a more direct geometric control means for the performance optimization of the circulation circle.
[0004] In the prior art, the paper "Liu Cheng. Parameterized design method of the centripetal turbine type hydrodynamic torque converter cascade system[D]. Beijing University of Technology, 2015." In order to meet the requirement that the design streamline is tangent everywhere, reduce flow loss, the design streamline is spliced by two circular arcs and a straight line tangent to them to develop an egg-shaped circulation circle. However, due to the combination of circular arcs and straight lines, the outer ring streamline and the inner ring streamline corresponding to the straight line segment have different degrees of concave line type, which is not conducive to the circulation of liquid flow in the torque converter cavity, and thus affects the overall transmission efficiency. SUMMARY
[0005] In view of the problems in the prior art, the present application proposes an egg-shaped circulation circle design method and structure based on an arc connecting line, which can improve the smoothness of the flow line of the hydrodynamic torque converter circulation circle, and thus improve the transmission efficiency of the torque converter.
[0006] In order to achieve the above purpose, the present application adopts the following technical scheme: The present application proposes an egg-shaped circulation circle design method based on an arc connecting line, comprising the following steps: S1, calculating the flow area according to the outer diameter, the inner diameter and the flow coefficient of the circulation circle; S2, calculating the radial coordinates of the upper stop point and the lower stop point of the intermediate flow line according to the outer diameter, the inner diameter and the flow area; S3, obtain the upper end arc radius, the lower end arc radius and the connecting arc radius of the intermediate stream line, and verify whether the upper end arc radius, the lower end arc radius and the connecting arc radius meet the constraint condition; S4, calculate the radial coordinate of the center of the upper end arc of the intermediate stream line according to the radial coordinate of the top dead center and the upper end arc radius, and calculate the radial coordinate of the center of the lower end arc of the intermediate stream line according to the radial coordinate of the bottom dead center and the lower end arc radius; S5, solve the center coordinate of the connecting arc, so that the connecting arc is tangent to the upper end arc and the lower end arc at the same time; S6, discretize the distribution angle of the intermediate stream line to generate discrete angles with a fixed angle step; S7, calculate the discrete coordinate points of the intermediate stream line according to the discrete angles; S8, based on one-dimensional beam theory, derive the corresponding point coordinates of the outer ring stream line and the inner ring stream line according to the discrete coordinate points of the intermediate stream line; S9, combine the corresponding point coordinates of the outer ring stream line and the inner ring stream line, and generate a complete egg-shaped circulation circle through the radial coordinate axis symmetry.
[0007] As a further improvement of the application, the calculation formula of the flow area in S1 is as follows:
[0008] In the formula: is the flow area; is the flow coefficient, and the value range is 0.2-0.26; is the outer diameter.
[0009] As a further improvement of the application, the calculation formula of the radial coordinate of the top dead center and the radial coordinate of the bottom dead center of the intermediate stream line in S2 is as follows:
[0010]
[0011] In the formula: is the radial coordinate of the top dead center of the intermediate stream line; is the radial coordinate of the bottom dead center of the intermediate stream line; is the inner diameter.
[0012] As a further improvement of the application, the constraint condition in S3 is as follows:
[0013]
[0014]
[0015] In the formula: Rup is the radius of the upper end arc; Rlow is the radius of the lower end arc; Rcon is the radius of the connecting arc; If the above constraint condition is satisfied, S4 is performed, and if not, the upper end arc radius, the lower end arc radius and the connecting arc radius of the intermediate streamline are re-acquired until the constraint condition is satisfied.
[0016] As a further improvement of the present application, the calculation formula of the radial coordinate of the center of the upper end arc and the radial coordinate of the center of the lower end arc in S4 is as follows:
[0017]
[0018] In the formula: Rup is the radial coordinate of the center of the upper end arc; Rlow is the radial coordinate of the center of the lower end arc.
[0019] As a further improvement of the present application, the process of solving the axial coordinate and the radial coordinate of the center of the connecting arc in S5 is as follows: The distance equations of the center of the connecting arc from the center of the upper end arc and the center of the lower end arc are as follows:
[0020] In the formula: Rcon is the radial coordinate of the center of the connecting arc; Rcon is the radial coordinate of the center of the connecting arc; The above distance equations are solved to obtain the center coordinates of the connecting arc.
[0021] As a further improvement of the present application, the process of S6 includes: The distribution angle of the intermediate streamline includes the upper end arc distribution angle of the intermediate streamline And the lower end arc distribution angle of the intermediate streamline ; The upper end arc distribution angle and the lower end arc distribution angle are discretized to generate discrete distribution angles at a fixed angle of 1°, and the expression is as follows: .
[0022] As a further improvement of the present application, the process of S7 includes: When the discrete distribution angle is less than the upper end arc distribution angle, the upper end arc discrete point coordinates of the intermediate streamline are calculated, and the calculation formula is as follows:
[0023] In the formula: Rup is the radial coordinate of the center of the upper end arc; Rup is the radial coordinate of the center of the upper end arc; When the discrete distribution angle is between the upper end circular distribution angle and the lower end circular distribution angle, the connecting circular discrete point coordinates of the middle streamline are calculated, and the calculation formula is as follows:
[0024] In the formula: And is the connecting circular discrete point coordinate; When the discrete distribution angle is greater than the lower end circular distribution angle, the lower end circular discrete point coordinates of the middle streamline are calculated, and the calculation formula is as follows:
[0025] In the formula: And is the lower end circular discrete point coordinate.
[0026] As a further improvement of the application, the process of S9 comprises: The inner ring streamline corresponding point coordinates are combined into an inner ring streamline point set; The outer ring streamline corresponding point coordinates are combined into an outer ring streamline point set; The inner ring streamline point set and the outer ring streamline point set are mirror copied along the radial coordinate axis to form an egg-shaped circulation circle.
[0027] The application provides an egg-shaped circulation circle structure, which is designed by the above method.
[0028] Compared with the prior art, the application has the following technical effects: Compared with the straight line segment formed by the middle streamline in the prior art egg-shaped circulation circle, the connecting segment circular arc which is tangent to the upper end circular arc of the middle streamline and the lower end circular arc of the middle streamline is designed by establishing a mathematical model and a geometric model, and the inner ring streamline and the outer ring streamline of the liquid torque converter circulation circle are designed according to one-dimensional beam theory.
[0029] When designing the egg-shaped liquid torque converter circulation circle, due to the design of the above method, the middle section and the first section of the outer ring streamline and the inner ring streamline of the circulation circle are the same as the third section of the streamline, and present an outward convex shape, so that the efficiency decline caused by the sudden change of the inner and outer ring streamline radius when the liquid flow in the liquid torque converter cavity circulates along the middle streamline is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 The figure is a flowchart of the application; Figure 2 The figure is a schematic diagram of the axial surface structure of the circulation circle of the application; Figure 3 The figure is a schematic diagram of the circulation circle parameters of the prior art; Figure 4 The figure is a schematic diagram of the circulation circle discrete point calculation of the application; Figure 5 Fig. 1 is a schematic view of a circular-cylinder surface structure according to the present application; Figure 6 Fig. 2 is a schematic view of a circular-cylinder surface structure according to the present application.
[0031] Fig. 1 is a schematic view of a circular-cylinder surface structure according to the present application; DETAILED DESCRIPTION
[0032] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and description are to be regarded as being exemplary in nature rather than limiting.
[0033] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0034] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.
[0035] In the present application, unless specifically defined otherwise and limited in the specification, the terms "mount", "connected", "connection", "fixed", and the like, should be construed broadly and do not necessarily require a direct connection or attachment between two elements. These terms can include indirect connections between two elements in the form of an indirect connection through one or more intermediate elements. In addition, a connection between two elements can be a mechanical connection, an electrical connection, or a communication connection. It will be apparent to those skilled in the art that these terms can have the same meaning as the corresponding terms used in the art.
[0036] In the present application, unless specifically defined otherwise and limited in the specification, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.
[0037] It should be understood that the terms "comprise" and "include" as used in the specification and the appended claims indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.
[0038] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.
[0039] It should be further understood that the term "and / or" as used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations thereof.
[0040] Various structural diagrams according to the disclosed embodiments of the present application are shown in the accompanying drawings. These drawings are not drawn to scale, in which certain details are exaggerated for the purpose of clarity and certain details can be omitted. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are only exemplary, and in actuality there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.
[0041] Referring to Figure 1 , the application is based on the egg-shaped circulation circle design method of circular arc connecting line, comprising the following steps: S1, calculating the flow area according to the outer diameter, inner diameter and flow coefficient of the obtained circulation circle; S2, calculating the radial coordinates of the upper dead point and the lower dead point of the intermediate flow line according to the outer diameter, inner diameter and flow area; S3, obtaining the upper end circular arc radius, lower end circular arc radius and connecting circular arc radius of the intermediate flow line, and verifying whether the upper end circular arc radius, lower end circular arc radius and connecting circular arc radius meet the constraint condition; S4, calculating the radial coordinate of the center of the upper end circular arc of the intermediate flow line according to the radial coordinate of the upper dead point and the upper end circular arc radius, and calculating the radial coordinate of the center of the lower end circular arc of the intermediate flow line according to the radial coordinate of the lower dead point and the lower end circular arc radius; S5, solving the center coordinates of the connecting circular arc so that the connecting circular arc is tangent to the upper end circular arc and the lower end circular arc at the same time; S6, discretizing the distribution angle of the intermediate flow line to generate discrete angles with a fixed angle step; S7, calculating the discrete coordinate points of the intermediate flow line according to the discrete angles; S8, deriving the corresponding point coordinates of the outer ring flow line and the inner ring flow line based on the one-dimensional beam theory according to the discrete coordinate points of the intermediate flow line; S9, merging the corresponding point coordinates of the outer ring flow line and the inner ring flow line to generate a complete egg-shaped circulation circle through radial coordinate axis symmetry.
[0042] The embodiments of the application will be described in detail below with reference to the accompanying drawings.
[0043] Referring to Figure 2 and Figure 3 , Figure 3 is a schematic diagram of the circulation circle parameters of the prior art, from which it can be seen that Figure 3 The existing intermediate flow line 232 of the circulation circle is a straight line segment, so it will cause the existing outer ring flow line 212 and the existing inner ring flow line 222 to form different degrees of concave line type, which is not conducive to the circulation flow of the liquid in the torque converter cavity; and the egg-shaped circulation circle 1 designed by the method of the application is composed of an outer ring flow line 11, an intermediate flow line 12 and an inner ring flow line 13, wherein the intermediate flow line 12 is a circular arc segment, so that the outer ring flow line 11 and the inner ring flow line 13 will form an outward expansion to solve the above problems.
[0044] The intermediate streamline 13 in the embodiment is composed of an upper end circular arc line 131, a circular arc connecting line 132 and a lower end circular arc line 133, the upper end circular arc line 131 is tangent to the first intersection point 134 with the circular arc connecting line 132, and the circular arc connecting line 132 is tangent to the second intersection point 135 with the lower end circular arc line 133; in the embodiment, the upper end circular arc line 131, the circular arc connecting line 132 and the lower end circular arc line 133 are arc segments of a circle, and have different centers and radii.
[0045] The outer ring streamline 11 in the embodiment is composed of a first upper end curve 111, a first connecting segment curve 112 and a first lower end curve 113; the inner ring streamline 12 is composed of a second upper end curve 121, a second connecting segment curve 122 and a second lower end curve 123.
[0046] Referring to Figure 1 The specific implementation steps of the embodiment of the application are described in detail as follows: Step S101, input the outer diameter of the egg-shaped circulation circle , the inner diameter and the flow coefficient In the embodiment, the outer diameter , the inner diameter , The flow coefficient is generally 0.2-0.26, in the embodiment, , and refer to Figure 4 ; Step S102, determine the flow area according to formula (1) ; (1) Step S103, determine the R (radial) coordinate of the upper dead point of the intermediate streamline in the circulation circle and the coordinate of the lower dead point of the intermediate streamline according to formula (2) and formula (3) R : (2) (3) Step S104, input the upper end circular arc radius of the intermediate streamline , the lower end circular arc radius and the connecting circular arc radius , which are given according to experience values; Step S105, determine whether the input parameters meet the requirements according to formula (4), (5) and (6), and if not, return to step S104 to re-input; (4) (5) (6) Step S106, see Figure 5 , according to formula (7), (8) to determine the R (radial) value of the coordinates of the center of the upper end arc of the intermediate streamline And the center of the lower end arc R value ;
[0047]
[0048] Step S107, the upper end arc of the intermediate streamline and the connecting arc are tangent in the embodiment, and the connecting arc and the lower end arc are tangent.
[0049] Assuming that the coordinate value of the center of the connecting arc is , the radius and the center of the connecting arc of the intermediate streamline satisfy the following equation group;
[0050] According to the equation group, the coordinate value of the center of the connecting arc is solved first, as shown in formula (10), and then the coordinate value is obtained by substituting the above equation group.
[0051] (10) Step S108, the angle value of the upper end arc of the intermediate streamline is judged by using the calculation formula (11) in the embodiment, if the value > 0, then step S109 is entered, otherwise step S110 is entered for calculation; (11) Step S109, the distribution angle of the upper end arc of the intermediate streamline is calculated according to formula (12) (12) Step S110, the distribution angle of the upper end arc of the intermediate streamline is calculated according to formula (13) (13) Step S111, the angle value of the lower end arc of the intermediate streamline is calculated and determined according to formula (14) in the embodiment, if the value < 0, then step S112 is entered, otherwise step S113 is entered; (14) Step S112, the distribution angle of the lower end arc of the intermediate streamline is calculated according to formula (15) : (15) Step S113, calculate the distribution angle of the lower end of the intermediate streamline according to formula (16) : (16) Step S114, discretize the distribution angle corresponding to the point of the intermediate streamline, and calculate the discrete distribution angle , whose calculation formula is as follows: .
[0052] Step S115, judge the value of the discrete distribution angle If the discrete distribution angle , execute step S116.
[0053] If , execute step S118.
[0054] If , execute step S120.
[0055] Step S116, calculate the coordinates of the discrete points of the upper end arc of the intermediate streamline ;
[0056] Step S117, calculate the coordinates of the point of the outer ring streamline of the circulation circle corresponding to the upper end arc of the intermediate streamline , and the coordinates of the point of the inner ring streamline ;
[0057]
[0058] Step S118, calculate the coordinates of the discrete points of the connecting arc of the intermediate streamline ;
[0059] Step S119, calculate the coordinates of the point of the outer ring streamline of the circulation circle corresponding to the connecting arc of the intermediate streamline , and the coordinates of the point of the inner ring streamline ;
[0060]
[0061] Step S120, calculating the coordinates of the discrete points of the lower end arc of the intermediate streamline ; ;
[0062] Step S121, calculating the coordinates of the outer loop streamline points corresponding to the lower end arc of the intermediate streamline , and the inner loop streamline points ; ;
[0063]
[0064] Step S122, combining the above calculated arrays to calculate the coordinates of the discrete point set of the outer loop streamline ; ; and the coordinates of the discrete point set of the inner loop streamline .
[0065]
[0066]
[0067] Step S123, combining the coordinates of the discrete point set of the outer loop streamline coordinates , and the coordinates of the discrete point set of the inner loop streamline coordinates , and the coordinates of the discrete point set of the inner loop streamline Figure 6 , and the calculation process ends.
[0068] The basic principles and main features of the present application and the advantages of the present application are shown and described above. It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be regarded as limiting the claims involved.
[0069] Furthermore, it should be understood that although the specification is described in terms of embodiments, each of which contains only one independent technical solution, the specification is described in this way only for the sake of clarity, and the skilled person should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that the skilled person can understand. The above is only to illustrate the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made on the basis of the technical solutions according to the technical idea of the present application falls within the protection scope of the claims of the present application.
Claims
1. A design method for an egg-shaped circular loop based on arc connecting lines, characterized in that, Includes the following steps: S1. Calculate the flow area based on the outer diameter, inner diameter, and flow coefficient of the circulation circle; S2. Calculate the radial coordinates of the top dead center and the bottom dead center based on the outer diameter, inner diameter, and flow area. S3. Obtain the upper arc radius, lower arc radius, and connecting arc radius of the middle streamline, and verify whether the upper arc radius, lower arc radius, and connecting arc radius meet the constraint conditions. S4. Calculate the radial coordinates of the center of the upper arc of the middle streamline based on the radial coordinates of the upper dead point and the radius of the upper arc. Calculate the radial coordinates of the center of the lower arc of the middle streamline based on the radial coordinates of the lower dead point and the radius of the lower arc. S5. Solve for the coordinates of the center of the connecting arc so that the connecting arc is tangent to both the upper and lower arcs. S6. Discretize the distribution angle of the intermediate streamlines and generate discretized angles with a fixed angle step size. S7. Calculate the discrete coordinate points of the intermediate streamline based on the discretization angle; S8. Based on one-dimensional beam theory, the coordinates of the corresponding points of the outer and inner streamlines are derived from the discrete coordinate points of the intermediate streamline. S9. Merge the coordinates of corresponding points of the outer and inner streamlines, and generate a complete egg-shaped circular loop through radial coordinate axis symmetry.
2. The egg-shaped circular design method based on arc connecting lines according to claim 1, characterized in that, The formula for calculating the flow area in S1 is as follows: In the formula: The cross-sectional area is the area of the flow path. This is the overcurrent coefficient, with a value ranging from 0.2 to 0.26; It is the outer diameter.
3. The egg-shaped circular design method based on arc connecting lines according to claim 1, characterized in that, The formulas for calculating the radial coordinates of the upper and lower streamlines in S2 are as follows: In the formula: The radial coordinates of the endpoint on the intermediate streamline; The radial coordinate of the endpoint of the intermediate streamline; It is the inner diameter.
4. The egg-shaped circular design method based on arc connecting lines according to claim 1, characterized in that, The constraints in S3 are as follows: In the formula: The radius of the upper arc; The radius of the lower arc; To connect the radius of the arc; If the above constraints are met, proceed to S4; otherwise, re-obtain the upper arc radius, lower arc radius, and connecting arc radius of the intermediate streamline until the constraints are met.
5. The egg-shaped circular design method based on arc connecting lines according to claim 1, characterized in that, The formulas for calculating the radial coordinates of the center of the upper and lower arcs in S4 are as follows: In the formula: The radial coordinates of the center of the upper arc; The coordinates are the radial coordinates of the center of the lower arc.
6. The egg-shaped circular design method based on arc connecting lines according to claim 1, characterized in that, The process of solving for the axial and radial coordinates of the center of the connecting arc in S5 is as follows: The equations for the distances between the center of the connecting arc and the centers of the upper and lower arcs are as follows: In the formula: and The coordinates of the center of the connecting arc; By solving the above distance equations simultaneously, we can obtain the coordinates of the center of the connecting arc.
7. The egg-shaped circular design method based on arc connecting lines according to claim 1, characterized in that, The process S6 includes: The calculation of the distribution angle of the intermediate streamline includes the distribution angle of the upper arc of the intermediate streamline. and the lower arc distribution angle ; The upper and lower arc distribution angles are discretized, and discrete distribution angles are generated with a fixed angle of 1°. The expression is as follows: 。 8. The egg-shaped circular design method based on arc connecting lines according to claim 1, characterized in that, The process in S7 includes: When the discrete distribution angle is smaller than the upper arc distribution angle, calculate the coordinates of the discrete points of the upper arc of the middle streamline as follows: In the formula: and The coordinates of the discrete points on the upper arc; When the discrete distribution angle is between the upper and lower circular arc distribution angles, the coordinates of the discrete points of the connecting arc of the intermediate streamline are calculated using the following formula: In the formula: and Connect the coordinates of discrete points on the circular arc; When the discrete distribution angle is greater than the lower arc distribution angle, calculate the coordinates of the discrete points of the lower arc of the middle streamline as follows: In the formula: and These are the coordinates of the discrete points on the lower circular arc.
9. The egg-shaped circular design method based on arc connecting lines according to claim 6, characterized in that, The process S9 includes: Merge the coordinates of the points corresponding to the inner streamline into a set of inner streamline points; Merge the coordinates of the points corresponding to the outer streamlines into a set of outer streamline points; The inner and outer streamline point sets are mirrored along the radial coordinate axis to form an egg-shaped circular loop.
10. An egg-shaped circular structure, characterized in that, It is designed and manufactured using the method described in any one of claims 1 to 9.