Design method of composite heat dissipation structure based on three-period minimal surface and composite heat dissipation structure

Abstract

The application discloses a composite heat dissipation structure design method and a composite heat dissipation structure based on a three-period minimal surface. The method comprises the following steps: a CLPT structure with a negative Poisson's ratio characteristic is constructed by combining a CLP structure in a three-period minimal surface (TPMS) with a sine periodic transformation, and a continuously connected porous base is formed based on the structure. The base has a very high specific surface area and rich internal connected flow channels, and can greatly increase the heat exchange interface area. On this basis, a fin structure is further introduced and Boolean fusion is performed with the TPMS skeleton, so that the fin is embedded in the skeleton. The fluid disturbance ability of the TPMS structure is retained, and the local heat exchange interface is increased through the fin, the fluid disturbance and the convective heat exchange effect are enhanced, so that the overall heat exchange performance is improved. The application is suitable for the heat dissipation structure design of high-end aerospace equipment and high heat flux density devices.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation structure design, specifically to a composite heat dissipation structure design method and composite heat dissipation structure based on a three-period minimal surface. Background Technology

[0002] With the rapid development of low-altitude economy, aerospace and other fields, related equipment has placed higher demands on thermal management capabilities. Especially in high heat flux density, lightweight and compact application scenarios, the heat transfer efficiency and structural adaptability of heat dissipation structures have become important factors affecting equipment performance and reliability.

[0003] Existing heat dissipation technologies mainly include radiators and heat pipes, which have played an important role in engineering applications, but still have certain limitations under complex operating conditions. For example, traditional radiators are limited by their structural form and heat exchange area, making it difficult to further improve their heat exchange capacity in highly integrated and miniaturized applications. Although heat pipe-type heat dissipation elements have good thermal conductivity, they are still constrained in terms of structural integration, space adaptability, and diverse configuration design. In addition, traditional heat dissipation structures mostly adopt regular fins, pin fins, or simple flow channel configurations, which generally suffer from problems such as a single heat transfer path, insufficient local fluid disturbance, and uneven temperature distribution. Therefore, it is difficult to balance heat dissipation efficiency and structural adaptability requirements under high heat flux density conditions.

[0004] Triply Periodic Minimal Surface (TPMS) structures are a type of space-filling structure characterized by continuous smooth surfaces, abundant interconnected channels, and high specific surface area. In recent years, TPMS structures have shown potential advantages in enhancing heat transfer, optimizing fluid flow, and achieving lightweight design. However, how to systematically incorporate TPMS structures into heat dissipation structure design, and how to flexibly control their heat conduction paths, fluid channels, and heat transfer performance in conjunction with specific configuration parameters, remains a pressing technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a composite heat dissipation structure design method and composite heat dissipation structure based on a three-period minimal surface, so as to solve the shortcomings of existing heat dissipation structures in terms of heat conduction path design, fluid channel control and structural parameterization.

[0006] To address the aforementioned technical problems, in a first aspect, this invention discloses a design method for a composite heat dissipation structure based on a three-period minimal curved surface, comprising the following steps:

[0007] S1: Construct a CLP structure in a three-period minimal surface based on implicit functions, introduce a sine function to rotate the implicit function of the CLP structure, and construct a CLPT heat dissipation structure model with negative Poisson bit properties.

[0008] S2: Introduce a fin structure into the CLPT heat dissipation structure model, and combine the fin structure with the CLPT structure through Boolean operations to obtain a composite heat dissipation structure combining a three-period minimal surface and fins.

[0009] S3: By controlling the spatial configuration parameters of the CLPT structure and the geometric parameters of the fin structure, the distribution of heat conduction paths and fluid channels in the composite heat dissipation structure is parametrically controlled.

[0010] Further, step S1 includes:

[0011] S11: Constructing the CLP structure in a three-period minimum surface based on implicit functions; the expression of the implicit function is:

[0012] ;

[0013] S12: Introduce a periodically changing sine function; the expression for the sine function is:

[0014] ;

[0015] S13: Based on the aforementioned sine function, the periodic transformation coordinate variable is derived, and its expression is:

[0016] ;

[0017] S14: Substitute the periodic transformation coordinate variables into the implicit function, and control the parameters accordingly. By adjusting the degree of rotation of the structure, a CLPT heat dissipation structure model with negative Poisson bit properties is generated.

[0018] 3. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that step S2 includes:

[0019] S21: Perform a first isosurface offset on the implicit function of the CLPT structure to generate the skeleton TPMS structure;

[0020] S22: Establish a parameterized fin model. The expression for the basic straight fin model is:

[0021] ;

[0022] in, This indicates the thickness of the base fin. Indicates fin height;

[0023] The fin model and the skeleton TPMS structure are subjected to Boolean operation to keep the fins in the internal region of the skeleton TPMS structure, forming a fin reinforcement structure.

[0024] S23: Perform a second isosurface offset based on the implicit function of the CLPT structure to generate a channel TPMS structure with connected space network characteristics;

[0025] S24: Perform Boolean operation on the fin reinforcement structure and the channel TPMS structure to merge them into a composite lattice structure that is connected as a whole, thereby obtaining the composite heat dissipation structure that combines a three-period minimal curved surface with fins.

[0026] 4. The design method for a composite heat dissipation structure based on a three-period minimal surface according to claim 1, characterized in that the mathematical model of the composite heat dissipation structure is expressed as:

[0027] ;

[0028] in: This is an implicit function of TPMS; and The offset parameter is used to control the size, wall thickness, and relative density of the generated fins; The equations represent the geometric constraints of the fins.

[0029] 5. The design method for a composite heat dissipation structure based on a three-period minimal surface according to claim 1, characterized in that the relative density of the composite heat dissipation structure is defined as follows: The volume fraction of the final composite solid region in the design domain is expressed as follows:

[0030] ;

[0031] Where L, W, and H represent the dimensions of the design domain in the x, y, and z directions, respectively.

[0032] 6. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that the adjustment of the geometric parameters and spatial distribution of the fin structure in step S3 includes one or more of the following methods:

[0033] By adjusting the offset parameters of the TPMS structure and The difference between The embedding depth of the fins on the TPMS surface is controlled to adjust the relative height of the fins;

[0034] The thickness of the fins can be adjusted by adjusting the thickness parameter w of the fin model.

[0035] By applying a rotational transformation to the fin model, the tilt angle θ of the fin relative to the TPMS structure is adjusted to regulate the angle of the fin.

[0036] The spacing between fins can be controlled by adjusting the spacing parameter s between adjacent fins;

[0037] The gradient distribution of fins in the composite heat dissipation structure can be controlled by designing the fin spacing increment.

[0038] 7. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that, based on the basic fins, customized design can be performed by introducing one or more of the following deformation functions:

[0039] Sine function: Used to add microwave-like textures to the surface of fins;

[0040] Gradient function: This is used to make the fin thickness change smoothly from the root to the tip;

[0041] Exponential function: This is used to concentrate the height of the fins in the central region of the heat source.

[0042] in, Let A represent the coordinate of the fin surface deformation in the x-direction, and let A represent the amplitude of the sine function. and These represent the wavelength and initial phase of the sine function, respectively. The initial thickness of the fin is represented by K, which represents the thickness gradient adjustment coefficient and is used to control the magnitude of the change in fin thickness with height. H is the total height of the fin, and n represents the thickness variation index, which is used to control the degree of nonlinearity of the thickness change with height.

[0043] 8. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that the method further includes:

[0044] The composite heat dissipation structure is verified for target relative density, structural constraints, and thermal-fluid coupling performance. If the verification fails, the offset parameters and fin parameters are readjusted. If the verification passes, a composite heat dissipation structure based on a three-period minimum surface is output.

[0045] Secondly, the present invention provides a composite heat dissipation structure based on a three-period minimal surface, designed using the above-mentioned design method. The composite heat dissipation structure includes:

[0046] A continuous, interconnected porous substrate formed by a CLPT structure is used to provide internal interconnected flow channels and heat exchange interfaces;

[0047] The fin structure, combined with the porous substrate, is used to form a directional heat conduction pathway;

[0048] The porous substrate and fin structure are fused together through Boolean operations to form an integrally connected composite lattice structure, realizing the integration of skeleton heat conduction, fin-enhanced heat transfer and fluid channel guidance functions.

[0049] Furthermore, the CLPT structure exhibits a two-dimensional negative Poisson's ratio characteristic, and its degree of rotation is determined by parameters. Control; when parameters When = 0, the CLPT structure degenerates into the CLP structure; when As the value increases, the rotational effect of the CLPT structure is enhanced.

[0050] The beneficial effects of this invention are as follows: By combining the CLP structure in the three-period minimal surface (TPMS) with a sinusoidal periodic transformation, a CLPT structure with negative Poisson bit properties is constructed, and a continuously connected porous substrate is formed based on this structure. This substrate has an extremely high specific surface area and abundant internal interconnected flow channels, which can significantly increase the heat transfer interface area. On this basis, a fin structure is further introduced and Boolean fused with the TPMS skeleton, so that the fins are embedded inside the skeleton. This not only retains the fluid disturbance capability of the TPMS structure, but also increases the local heat transfer interface through the fins, enhances the fluid disturbance and convective heat transfer effect, thereby improving the overall heat transfer performance. It is suitable for the heat dissipation structure design of high-end aerospace equipment and high heat flux density devices. Attached Figure Description

[0051] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, use the same reference numerals to denote the same or similar parts. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0052] Figure 1 This is a flowchart illustrating the design of a composite heat dissipation structure based on a combination of a three-period minimal curved surface and fins.

[0053] Figure 2 A schematic diagram showing the morphological evolution of the CLPT structure under different rotational parameter g values;

[0054] Figure 3 A schematic diagram of a composite heat dissipation structure based on a three-period base minima and fins;

[0055] Figure 4 Diagrams showing composite heat dissipation structures at different relative heights;

[0056] Figure 5 Diagrams of composite heat dissipation structures with different thicknesses;

[0057] Figure 6 Diagrams of composite heat dissipation structures with different tilt angles;

[0058] Figure 7 Diagram of composite heat dissipation structures with different fin spacings;

[0059] Figure 8 Diagram of composite heat dissipation structures with different spacing increments;

[0060] Figure 9 Wall shear stress contour plots for three heat dissipation structures

[0061] Figure 10 The graph shows the changes in heat dissipation and flow characteristics of three heat dissipation structures. Detailed Implementation

[0062] Firstly, such as Figure 1 As shown, this invention provides a design method for a composite heat dissipation structure based on a three-period minimal surface, comprising the following steps:

[0063] S1: Based on the implicit function, construct the CLP structure in the three-period minimal surface (TPMS), introduce the sine function to rotate the implicit function of the CLP structure, and construct the CLPT heat dissipation structure model with negative Poisson bit property;

[0064] S2: Introduce a fin structure into the CLPT heat dissipation structure model, and combine the fin structure with the CLPT structure through Boolean operations to obtain a composite heat dissipation structure combining a three-period minimal surface and fins.

[0065] S3: By controlling the spatial configuration parameters of the CLPT structure and the geometric parameters of the fin structure, the distribution of heat conduction paths and fluid channels in the composite heat dissipation structure is parametrically controlled.

[0066] This method constructs a CLPT structure with negative Poisson bit properties by combining the CLP structure in the three-period minimal surface (TPMS) with a sinusoidal periodic transformation, and forms a continuously connected porous substrate based on this structure. This substrate has an extremely high specific surface area and abundant internal interconnected channels, which can significantly increase the heat transfer interface area. On this basis, a fin structure is further introduced and Boolean fused with the TPMS skeleton, so that the fins are embedded inside the skeleton. This not only retains the fluid disturbance capability of the TPMS structure, but also increases the local heat transfer interface through the fins, enhances the fluid disturbance and convective heat transfer, thereby improving the overall heat transfer performance. It is suitable for the heat dissipation structure design of high-end aerospace equipment and high heat flux density devices.

[0067] According to one embodiment of this application, step S1 includes:

[0068] S11: Constructing the CLP structure in a three-period minimum surface based on implicit functions; the expression of the implicit function is:

[0069] ;

[0070] S12: Introduce a periodically changing sine function; the expression for the sine function is:

[0071] ;

[0072] S13: Based on the aforementioned sine function, the periodic transformation coordinate variable is derived, and its expression is:

[0073] ;

[0074] S14: Substitute the periodically transformed coordinate variables into the implicit function, and control the parameters accordingly. By adjusting the degree of rotation of the structure, a CLPT heat dissipation structure model with negative Poisson bit properties is generated.

[0075] The CLPT structure exhibits a two-dimensional negative Poisson's ratio characteristic, and its rotation can be adjusted by controlling the parameter g. When g=0, the CLPT structure degenerates into a CLP structure; as the value of g increases, the rotational effect of the structure is enhanced. Figure 2 A schematic diagram of the morphological evolution of the CLPT structure under different rotational parameter g values ​​is given; the subsequent construction of the composite heat dissipation structure will be based on the CLPT structure generated when the parameter g=0.8 for example illustration.

[0076] According to one embodiment of this application, step S2 includes:

[0077] S21: Based on the CLPT heat dissipation structure model obtained in step S1, the implicit function of the three-period minimum surface is offset by isosurface to generate the skeleton TPMS structure; the skeleton TPMS structure is used to form the main support skeleton and main heat conduction path of the composite heat dissipation structure.

[0078] S22: Establish a parameterized fin model. The expression for the basic straight fin model is:

[0079] ;

[0080] in, This indicates the thickness of the base fin. Indicates fin height;

[0081] By performing Boolean operations on the fin model and the skeleton TPMS structure, the fins are retained in the internal region of the skeleton TPMS structure, forming a fin-reinforced structure that is combined with the skeleton TPMS structure. By embedding the fins inside the skeleton TPMS structure, the heat transfer interface area inside the structure can be increased, and the heat exchange capacity of the composite heat dissipation structure can be improved.

[0082] S23: Based on the implicit function of the CLPT structure, the second isosurface is offset to generate the channel TPMS structure. The channel TPMS structure is used to form the main fluid channel inside the composite heat dissipation structure. The channel TPMS structure has the characteristics of a connected spatial network, which can provide a continuous path for fluid flow.

[0083] S24: Boolean operation is performed on the fin-enhanced structure and the channel TPMS structure to merge them into a composite lattice structure that is connected as a whole, resulting in a composite heat dissipation structure that combines a three-period minimal surface with fins. The composite heat dissipation structure constructed in this way realizes the integration of skeleton heat conduction, fin-enhanced heat transfer and fluid channel guidance functions, which is conducive to improving the overall heat transfer performance and provides a foundation for subsequent structural parameter optimization and additive manufacturing.

[0084] According to one embodiment of this application, a schematic diagram of the construction of the composite heat dissipation structure is shown below. Figure 3 As shown, the mathematical model of the composite heat dissipation structure is expressed as follows:

[0085] ;

[0086] in: This is an implicit function of TPMS; and The offset parameter is used to control the size, wall thickness, and relative density of the generated fins; The equations represent the geometric constraints of the fins.

[0087] According to one embodiment of this application, during the construction of the composite structure, the final composite entity region after Boolean operation is used as the calculation object for volume fraction, and the relative density of the composite heat dissipation structure is uniformly characterized and controlled. The geometric constraint equations representing the fins are then... The adaptive fin region, obtained by Boolean operations on the fin and skeletal TPMS, can be represented as:

[0088] ;

[0089] Therefore, the relative density definition of the composite heat dissipation structure in this embodiment The volume fraction of the final composite solid region in the design domain is expressed as follows:

[0090] ;

[0091] Where L, W, and H represent the dimensions of the design domain in the x, y, and z directions, respectively.

[0092] According to one embodiment of this application, the control of the geometric parameters and spatial distribution of the fin structure in step S3 includes one or more of the following methods:

[0093] By adjusting the offset parameters of the TPMS structure and The difference between By controlling the embedding depth of the fins on the TPMS surface, the spatial distribution range of the fins in the high-wall-thickness TPMS region can be altered; for example: when Take 0.6875, and change The value of makes The values ​​are 0.2, 0.4, and 0.6, respectively, forming fin structures with different relative heights, as shown in the diagram. Figure 4 As shown;

[0094] The thickness of the fins is adjusted by modifying the thickness parameter w of the fin model; the cross-sectional dimensions of the fin structure are changed, thereby controlling its solid proportion and spatial distribution characteristics within the TPMS skeleton. For example, when the fin thickness w is 0.3mm, 0.5mm, and 0.9mm, fin structures of different thicknesses are formed, as shown in the figure. Figure 5 As shown;

[0095] By applying a rotational transformation to the fin model, the tilt angle θ of the fins relative to the TPMS structure is adjusted to change the fin angle, thereby altering the orientation distribution of the fins in space. For example, when the tilt angle θ is 5°, 10°, and 15°, the corresponding structures are as follows: Figure 6 As shown;

[0096] By adjusting the spacing parameter 's' between adjacent fins, the fin spacing can be controlled, thereby altering the fin density within the TPMS structure and achieving fin structures with different spatial distributions. For example, spacings 's' of 1.4 mm, 1.9 mm, and 2.4 mm result in structures such as... Figure 7 As shown;

[0097] By designing a gradient in the fin spacing increment, the gradient distribution of the fins in the composite heat dissipation structure can be controlled; this allows for a non-uniform arrangement of the fins within the composite heat dissipation structure, thereby meeting the requirements for local heat transfer or flow resistance characteristics. For example, when the initial spacing is 1mm, and the spacing increment ξ is taken as 0.4mm, 0.5mm, and 0.6mm respectively, the corresponding structures are as follows: Figure 8 As shown.

[0098] According to one embodiment of this application, a customized design can be performed based on the basic fins by introducing one or more of the following deformation functions:

[0099] Sine function: Used to add microwave texture to the surface of fins to promote fluid turbulence;

[0100] Gradient function: This is used to make the fin thickness change smoothly from the root to the tip, in order to optimize the heat conduction path;

[0101] Exponential function: This is used to concentrate the height of the fins in the central area of ​​the heat source, so as to precisely enhance the heat dissipation of hot spots;

[0102] in, Let A represent the coordinate of the fin surface deformation in the x-direction, and let A represent the amplitude of the sine function. and These represent the wavelength and initial phase of the sine function, respectively. The initial thickness of the fin is represented by K, which represents the thickness gradient adjustment coefficient and is used to control the magnitude of the change in fin thickness with height. H is the total height of the fin, and n represents the thickness variation index, which is used to control the degree of nonlinearity of the thickness change with height.

[0103] This embodiment further customizes the fins by introducing a simple control function deformation. In practical applications, multiple deformations are often used in combination. For example, for CPU hotspots, gradient functions and exponential functions are used simultaneously to make the fins "higher and thinner" at the heat source location, which can significantly improve heat dissipation uniformity. All parameters can be directly input and implemented through conventional CAD / CAE software.

[0104] According to one embodiment of this application, the method further includes:

[0105] The composite heat dissipation structure is verified for target relative density, structural constraints, and thermal-fluid coupling performance. If the verification fails, the offset parameters and fin parameters are readjusted. If the verification passes, the composite heat dissipation structure based on a three-period minimum surface is output.

[0106] For example, the wall shear stress distribution of the composite heat dissipation structure can be verified. The verification process is as follows:

[0107] The design selects a CLPT heat dissipation structure and two CLPT composite heat dissipation structures with fins. CLPT-fin1 is a heat dissipation structure with fins arranged at equal intervals (fin spacing 2.38mm, relative height 0.5, thickness 0.5mm), while CLPT-fin2 is a composite heat dissipation structure with unconventional fin distribution. Figure 9 Wall shear stress distribution contour maps for different structures are presented. Analysis results show that the high wall shear stress region in the CLPT heat dissipation structure is mainly located on the curved surface of the upper half of the structure; after adding heat dissipation fins, obvious high wall shear stress regions appear on the fin surfaces. Simultaneously, due to the fin structure altering the flow path and local velocity distribution of the fluid at the bottom, a high wall shear stress region also appears at the bottom of the structure, and the average wall shear stress of both composite heat dissipation structures is higher than that of the CLPT heat dissipation structure.

[0108] The above results show that by adjusting the spatial distribution of the fin structure, the flow state inside the composite heat dissipation structure can be effectively changed, thus providing a basis for subsequent improvement of heat exchange performance.

[0109] For example, the enhanced heat exchange capability of the composite heat dissipation structure can be verified. The verification process is as follows:

[0110] Using three selected heat dissipation structures as research objects, the temperature difference, pressure difference, convective heat transfer coefficient h and j factor of each structure under different inlet flow conditions are compared and analyzed to verify the heat transfer performance of the composite heat dissipation structure.

[0111] Analysis results show that, under the same operating conditions, the temperature difference between the CLPT-fin1 and CLPT-fin2 composite heat dissipation structures is smaller than that of the CLPT heat dissipation structure, indicating that the heat transfer capacity of the structures is improved after the introduction of fins. At the same time, the pressure drop of the composite heat dissipation structures increases, indicating a corresponding increase in flow resistance. Further analysis of the convective heat transfer coefficients h and j shows that the overall heat transfer performance of both composite heat dissipation structures is superior to that of the CLPT heat dissipation structure.

[0112] Where j is the Colburn factor, a dimensionless parameter characterizing convective heat transfer performance, and its expression is:

[0113] ;

[0114] In the formula, For Nusselt numbers, The Reynolds number is... It is a Prandtl number; A larger factor indicates that the structure has better convective heat transfer performance under the same flow conditions.

[0115] according to Figure 10 The graphs shown demonstrate that by introducing fins into the CLPT heat dissipation structure and adjusting the spatial distribution of the fins, the heat transfer performance of the structure can be effectively improved.

[0116] Secondly, this invention discloses a composite heat dissipation structure based on a three-period minimal surface, designed using the above-mentioned design method. The composite heat dissipation structure includes:

[0117] A continuous, interconnected porous substrate formed by a CLPT structure is used to provide internal interconnected flow channels and heat exchange interfaces;

[0118] The fin structure, combined with the porous substrate, forms a directional heat conduction pathway to regulate the heat conduction path.

[0119] The porous substrate and fin structure are fused together through Boolean operations to form an integrally connected composite lattice structure, realizing the integration of skeleton heat conduction, fin-enhanced heat transfer and fluid channel guidance functions.

[0120] This composite heat dissipation structure can increase the surface area of ​​the structure, enhance fluid disturbance and convective heat transfer, thereby improving the overall heat transfer performance. It is suitable for the heat dissipation structure design of high-end aerospace equipment and high heat flux density devices.

[0121] According to one embodiment of this application, the CLPT structure has a two-dimensional negative Poisson's ratio characteristic, and its rotation degree is determined by parameters. Control; when parameters When = 0, the CLPT structure degenerates into the CLP structure; when As the value increases, the rotational effect of the CLPT structure is enhanced. This characteristic enables beneficial deformation coupling of the heat dissipation structure under stress, improving its fit with complex mounting interfaces or thermally deformable interfaces. It is particularly suitable for harsh operating conditions such as vibration and thermal expansion in aerospace equipment, helping to reduce contact thermal resistance and improve long-term reliability.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A design method for a composite heat dissipation structure based on a three-period minimal surface, characterized in that, Includes the following steps: S1: Construct a CLP structure in a three-period minimal surface based on implicit functions, introduce a sine function to rotate the implicit function of the CLP structure, and construct a CLPT heat dissipation structure model with negative Poisson bit properties. S2: Introduce a fin structure into the CLPT heat dissipation structure model, and combine the fin structure with the CLPT structure through Boolean operations to obtain a composite heat dissipation structure combining a three-period minimal surface and fins. S3: By controlling the spatial configuration parameters of the CLPT structure and the geometric parameters of the fin structure, the distribution of the heat conduction path and fluid channel in the composite heat dissipation structure is parametrically controlled.

2. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that, Step S1 includes: S11: Constructing the CLP structure in a three-period minimum surface based on implicit functions; the expression of the implicit function is: ； S12: Introduce a periodically changing sine function; the expression for the sine function is: ； S13: Based on the aforementioned sine function, the periodic transformation coordinate variable is derived, and its expression is: ； S14: Substitute the periodic transformation coordinate variables into the implicit function, and control the parameters accordingly. By adjusting the degree of rotation of the structure, a CLPT heat dissipation structure model with negative Poisson bit properties is generated.

3. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that, Step S2 includes: S21: Perform a first isosurface offset on the implicit function of the CLPT structure to generate the skeleton TPMS structure; S22: Establish a parameterized fin model. The expression for the basic straight fin model is: ； in, This indicates the thickness of the base fin. Indicates fin height; The fin model and the skeleton TPMS structure are subjected to Boolean operation to keep the fins in the internal region of the skeleton TPMS structure, forming a fin reinforcement structure. S23: Perform a second isosurface offset based on the implicit function of the CLPT structure to generate a channel TPMS structure with connected space network characteristics; S24: Perform Boolean operation on the fin reinforcement structure and the channel TPMS structure to merge them into a composite lattice structure that is connected as a whole, thereby obtaining the composite heat dissipation structure that combines a three-period minimal curved surface with fins.

4. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that, The mathematical model of the composite heat dissipation structure is expressed as follows: ； in: This is an implicit function of TPMS; and The offset parameter is used to control the size, wall thickness, and relative density of the generated fins; The geometric constraint equations for the fins are given.

5. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that, The relative density definition of the composite heat dissipation structure The volume fraction of the final composite solid region in the design domain is expressed as follows: ； Where L, W, and H represent the dimensions of the design domain in the x, y, and z directions, respectively.

6. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that, The control of the geometric parameters and spatial distribution of the fin structure in step S3 includes one or more of the following methods: By adjusting the offset parameters of the TPMS structure and The difference between The embedding depth of the fins on the TPMS surface is controlled to regulate the relative height of the fins; The thickness of the fins can be adjusted by adjusting the thickness parameter w of the fin model. By applying a rotational transformation to the fin model, the tilt angle θ of the fin relative to the TPMS structure is adjusted to regulate the angle of the fin. The spacing between fins can be controlled by adjusting the spacing parameter s between adjacent fins; The gradient distribution of fins in the composite heat dissipation structure can be controlled by designing the fin spacing increment.

7. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that, Based on the aforementioned basic fins, customized designs can be achieved by introducing one or more of the following deformation functions: Sine function: Used to add microwave-like textures to the surface of fins; Gradient function: This is used to make the fin thickness change smoothly from the root to the tip; Exponential function: This is used to concentrate the height of the fins in the central region of the heat source. in, Let A represent the coordinate of the fin surface deformation in the x-direction, and let A represent the amplitude of the sine function. and These represent the wavelength and initial phase of the sine function, respectively. The initial thickness of the fin is represented by K, which represents the thickness gradient adjustment coefficient and is used to control the magnitude of the change in fin thickness with height. H is the total height of the fin, and n represents the thickness variation index, which is used to control the degree of nonlinearity of the thickness change with height.

8. The composite heat dissipation structure design method based on a three-period minimal surface according to claim 1, characterized in that, The method also includes: The composite heat dissipation structure is verified for target relative density, structural constraints, and thermal-fluid coupling performance. If the verification fails, the offset parameters and fin parameters are readjusted. If the verification passes, a composite heat dissipation structure based on a three-period minimum surface is output.

9. A composite heat dissipation structure based on a three-period minimal curved surface, characterized in that, The composite heat dissipation structure, designed using the method of any one of claims 1 to 7, comprises: A continuous, interconnected porous substrate formed by a CLPT structure is used to provide internal interconnected flow channels and heat exchange interfaces; The fin structure, combined with the porous substrate, is used to form a directional heat conduction pathway; The porous substrate and fin structure are fused together through Boolean operations to form an integrally connected composite lattice structure, realizing the integration of skeleton heat conduction, fin-enhanced heat transfer and fluid channel guidance functions.

10. The composite heat dissipation structure based on a three-period minimal surface according to claim 1, characterized in that, The CLPT structure exhibits a two-dimensional negative Poisson's ratio characteristic, and its rotation is determined by parameters. Control; when parameters When = 0, the CLPT structure degenerates into the CLP structure; when As the value increases, the rotational effect of the CLPT structure is enhanced.

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