CN-121980636-A - Heat exchange device with mixed TPMS structure and construction method thereof

CN121980636ACN 121980636 ACN121980636 ACN 121980636ACN-121980636-A

Abstract

The application provides a heat exchange device of a mixed TPMS structure and a construction method thereof, relates to the field of heat energy engineering and new energy automobiles, and solves the technical problems that the conventional TPMS heat exchanger adopts fixed topology, is difficult to cooperatively optimize heat exchange and flow performance under the same porosity and appearance, and has limited energy efficiency and cannot adapt to self-adaptive heat management requirements under variable working conditions. The method comprises the steps of selecting two different TPMSD structures, constructing a basic topology unit of a hybrid heat exchange core, extracting implicit functions corresponding to the two TPMS structures, determining weighting coefficients of the two TPMS structures according to target heat exchange performance requirements, constructing a composite implicit function representing the variable coefficient hybrid TPMS structure based on the weighting coefficients and the implicit functions of the two TPMS structures, and constructing a three-dimensional geometric model of the hybrid heat exchange core based on the composite implicit function. The method is used in the construction process of the mixed TPMS structure.

Inventors

QIAN YEJIAN
LI YAO
WEI XIAOFEI
WU KANGWEI
QIAN DUODE

Assignees

合肥工业大学

Dates

Publication Date: 20260505
Application Date: 20260122

Claims (10)

1. The construction method of the mixed TPMS structure is characterized by comprising the following steps of: Selecting a first type TPMS structure and a second type TPMS structure to construct a basic topology unit of the hybrid heat exchange core, and extracting implicit functions corresponding to the first type TPMS structure and the second type TPMS structure, wherein the first type TPMS structure and the second type TPMS structure are in two different standard three-period minimum curved surface configurations; Determining a first weighting coefficient of the first-type TPMS structure and a second weighting coefficient of the second-type TPMS structure according to target heat exchange performance requirements, wherein the sum of the first weighting coefficient and the second weighting coefficient is one, and the values of the first weighting coefficient and the second weighting coefficient are respectively larger than zero and smaller than one; Constructing a composite implicit function representing a variable coefficient mixed TPMS structure based on the first weighting coefficient, the second weighting coefficient, the first type TPMS structure and the implicit function of the second type TPMS structure; And constructing a three-dimensional geometric model of the hybrid heat exchanger core based on the composite implicit function.
2. The method for constructing a hybrid TPMS structure according to claim 1, wherein, under the same porosity conditions, the specific heat exchange surface area per unit volume of the first type TPMS structure is greater than the specific heat exchange surface area per unit volume of the second type TPMS structure, and the effective fluid flow rate of the second type TPMS structure is greater than the effective fluid flow rate of the first type TPMS structure; The effective fluid circulation efficiency is the reciprocal of steady-state pressure loss generated by different TPMS structures under the same inlet flow velocity and geometric scale.
3. The method for constructing a hybrid TPMS structure according to claim 1, wherein the obtaining the weighting coefficients corresponding to the first type TPMS structure and the second type TPMS structure includes: establishing a fitting relation model between at least one target performance index representing heat exchange performance and weighting coefficients and fluid flow parameters of the two TPMS structures, wherein the target performance index comprises heat exchange quantity or power resistance ratio; determining a target value of a target performance index and a working condition value of a fluid flow parameter according to an actual thermal management task; Substituting the target value and the working condition value into the fitting relation model, and reversely solving a weighting coefficient combination meeting the target value, wherein the weighting coefficient combination comprises a first weighting coefficient and a second weighting coefficient.
4. A method for constructing a hybrid TPMS structure according to claim 3, wherein the method for constructing the fitting relation model comprises: extracting a plurality of target performance indexes, weighting coefficients of the two TPMS structures and fluid flow parameters from historical data, and establishing a least square curve among the three; Setting any weighting coefficient Is the range of values and the average flow velocity of the fluid cross section Forming a two-dimensional parameter space, wherein any weighting coefficient is a first weighting coefficient or a second weighting coefficient; in the parameter space, a plurality of sample points are generated by adopting a space filling sampling method, and each sample point corresponds to a group of sample points , ) Combining; Constructing a corresponding coefficient hybrid TPMS structure three-dimensional model for each sample point, and calculating corresponding heat exchange quantity Q and fluid pressure drop through steady state numerical simulation ; Based on the heat exchange amount Q and the fluid pressure drop Calculating the power resistance ratio f=q- ; With the weighting coefficient And average flow velocity in cross section And taking the heat exchange quantity Q and the power resistance ratio f as independent variables respectively, and constructing by multi-element nonlinear regression to obtain a fitting relation model.
5. The method for constructing a hybrid TPMS structure according to claim 1, wherein the constructing represents a composite implicit function of a variable coefficient hybrid TPMS structure Comprising: ; Wherein, the As an implicit function of the first type TPMS structure, As an implicit function of the second type TPMS structure, As a first weighting coefficient, For the second weighting factor to be a second weighting factor, , Is a correction coefficient.
6. The method according to claim 5, wherein the correction coefficients of the correction coefficients are the same According to the weighting coefficient The deviation of the porosity from the preset target porosity is determined, Wherein, the method comprises the steps of, For a preset target porosity to be achieved, And fitting the obtained functional relation based on the numerical simulation data.
7. The method for constructing a hybrid TPMS structure according to claim 1, wherein the constructing the three-dimensional geometric model of the hybrid heat exchanger core includes: generating three-dimensional space grids in the outer shape of the preset heat exchanger core, and calculating the position of each grid point A function value; Based on the function value, generating a function meeting the requirement by adopting an isosurface extraction algorithm Is a neutral curved triangular mesh; Shifting along the normal direction along the neutral curved surface to form a solid shell with preset wall thickness, and constructing a closed solid model through a closed end surface; And carrying out three-dimensional period prolongation on the closed solid model according to a preset unit cell period, and cutting the closed solid model to the boundary of the appearance domain to obtain a three-dimensional geometric model of the heat exchanger core.
8. The method for building a hybrid TPMS structure as recited in claim 7, wherein after the three-dimensional geometric model of the heat exchanger core is built, overhang area detection is performed on the three-dimensional geometric model, geometric correction is performed on a surface area which does not satisfy self-supporting forming ability, and the surface area which does not satisfy self-supporting forming ability has an included angle between the surface area and a self-supporting forming direction larger than a preset included angle.
9. A heat exchange device of a hybrid TPMS structure, which operates based on the construction method of the hybrid TPMS structure as set forth in any one of claims 1 to 8, characterized in that the device comprises a hybrid TPMS core (1), an outer wall surface (2), an inlet and outlet channel (3), an inner wall surface (4) and a partition plate (5); the mixed TPMS core body (1) is formed by a porous framework formed by weighting and fusing a first type TPMS structure and a second type TPMS structure, and a first fluid flow channel and a second fluid flow channel which are mutually isolated are formed inside the mixed TPMS core body; the outer wall surface (2) is coated on the periphery of the mixed TPMS core body (1), and is made of the same material as the mixed TPMS core body (1); The inner wall surface (4) is positioned in the mixed TPMS core body (1) and separates the first fluid flow channel from the second fluid flow channel; The inlet and outlet channel (3) comprises an inlet and an outlet which are respectively communicated with the first fluid flow channel and the second fluid flow channel; the partition board (5) is arranged in the connection area of the inlet and outlet channels and the mixed TPMS core body (1) and is used for blocking the communication of the first fluid flow channel and the second fluid flow channel at the inlet and outlet.
10. The heat exchange device of the mixed TPMS structure as claimed in claim 9, wherein the mixed TPMS core body (1), the outer wall surface (2), the partition plate (5) and the inlet and outlet channels (3) are made of high-temperature-resistant and corrosion-resistant metal material aluminum alloy, and the external dimension and the wall thickness of the mixed TPMS core body (1) are the same as those of a traditional plate-type heat exchanger for a vehicle.

Description

Heat exchange device with mixed TPMS structure and construction method thereof Technical Field The application relates to the field of thermal energy engineering and new energy automobiles, in particular to a heat exchange device of a hybrid TPMS structure and a construction method thereof. Background With the continuous improvement of the requirements of new energy automobiles, high-power electronic equipment and aerospace systems on the heat management performance, the traditional heat exchanger is difficult to meet the contradictory requirements of high heat exchange efficiency and low flow resistance in a limited space. In recent years, porous structures based on three-period extremely small curved surfaces (Triply Periodic Minimal Surface, TPMS) have been widely explored for high-performance heat exchange core design due to their high specific surface area, good connectivity and excellent mechanical properties. However, in the prior art, a single TPMS configuration, such as Gyroid or Diamond, is generally adopted, the topology geometry of which is fixed, cannot be adapted according to the different requirements of different thermal management scenes such as a battery, a motor, an electric controller and the like, and is often excellent in performance under a certain working condition, but the energy efficiency is obviously reduced under other working conditions, and the coupling between heat exchange and flow performance is limited due to the lack of active regulation capability of structural performance; Therefore, there is a need for a heat exchange device and efficient construction method thereof that can tune the internal topological properties as needed to break through the performance boundaries of a single structure. Disclosure of Invention The application provides a heat exchange device of a mixed TPMS structure and a construction method thereof, which solve the technical problems that the prior TPMS heat exchanger adopts a fixed topology, is difficult to cooperatively optimize heat exchange and flow performance under the same porosity and appearance, causes limited energy efficiency and cannot adapt to the self-adaptive thermal management requirements under variable working conditions. In order to achieve the above purpose, the application adopts the following technical scheme: Selecting a first type TPMS structure and a second type TPMS structure, constructing a basic topology unit of a hybrid heat exchange core, and extracting implicit functions corresponding to the first type TPMS structure and the second type TPMS structure, wherein the first type TPMS structure and the second type TPMS are in two different standard three-period minimum curved surface configurations; Determining a first weighting coefficient of the first-type TPMS structure and a second weighting coefficient of the second-type TPMS structure according to target heat exchange performance requirements, wherein the sum of the first weighting coefficient and the second weighting coefficient is one, and the values of the first weighting coefficient and the second weighting coefficient are respectively larger than zero and smaller than one; Constructing a composite implicit function representing a variable coefficient mixed TPMS structure based on the first weighting coefficient, the second weighting coefficient and the implicit functions of the two TPMS structures; And constructing a three-dimensional geometric model of the hybrid heat exchanger core based on the composite implicit function. Based on the above technical scheme, in the method for constructing the hybrid TPMS structure provided by the application, in the advanced thermal management system, a single TPMS structure is difficult to meet the dual requirements of high heat exchange density and low flow resistance at the same time, and the performance cannot be dynamically adjusted according to the actual working condition due to the fixed topological characteristic. Therefore, there is a need for a heat exchange core design method that can customize the internal structure as desired. According to the application, two standard TPMS configurations (such as a Diamond type and a Gyroid type) with complementary performances are selected, and a normalized weighting coefficient combination is introduced to construct a composite implicit function based on the implicit function, so that a variable coefficient mixed topology is formed. The scheme has the core advantages that the optimal heat-flow balance point can be accurately positioned in a continuous pedigree by only adjusting the weight without changing the external size or the porosity, and 'one-structure and multi-scene' adaptation is realized. Meanwhile, the geometric model generated based on the implicit function naturally has periodicity, no-defect communication flow channels and smooth curved surfaces, and simulation reliability and additive manufacturing feasibility are ensured. Compared with the traditional discret