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CN-122015543-A - Collaborative phase change uniform Wen Xingre buffer with overload adaptability

CN122015543ACN 122015543 ACN122015543 ACN 122015543ACN-122015543-A

Abstract

The invention discloses a coordinated phase change Wen Xingre buffer with overload adaptability, and relates to the technical field of aerospace thermal management and high-power electronic device heat dissipation. The uniform temperature type heat buffer comprises a heat storage cavity, a heat pipe assembly, a liquid filling port and a fractal tree rib structure arranged in the heat storage cavity. The condensing section shell, the heat storage cavity matrix and the three-dimensional fractal tree rib structure of the heat pipe assembly are integrally formed through additive manufacturing, so that a continuous metal heat conduction path is formed, and the interface thermal resistance between the heat pipe assembly and the heat storage cavity is reduced. The fractal tree rib structure is in a self-similar topological configuration of gradual bifurcation of main pulse-branch-terminal along the direction away from the condensing section of the heat pipe assembly, and is used for rapidly expanding heat from the condensing section to the phase-change material in the heat storage space and serving as a crystallization nucleation framework in the solidification process of the phase-change material. The invention realizes the cooperative coupling of the rapid heat transfer of the heat pipe and the latent heat energy storage of the phase change material, can reduce the internal temperature gradient of the phase change material, and improves the temperature uniformity, the circulation stability and the high overload working condition adaptability in the heat buffering process.

Inventors

  • ZHANG XUAN
  • CHEN YONGPING

Assignees

  • 苏州科技大学

Dates

Publication Date
20260512
Application Date
20260311

Claims (10)

  1. 1. A synergistic phase change uniform Wen Xingre buffer with overload adaptation, comprising: The heat storage device comprises a heat storage cavity (1), wherein a liquid filling port (3) is arranged on the heat storage cavity (1), and phase change materials are filled in the heat storage cavity (1) through the liquid filling port (3); the heat pipe assembly (2) is provided with an evaporation section and a condensation section, wherein the evaporation section is arranged at a heat source, and the condensation section is at least partially embedded in the heat storage cavity (1); The heat storage cavity (1) is internally provided with a three-dimensional fractal tree rib structure (4), the fractal tree rib structure (4) is immersed in the phase change material, and the internal space of the heat storage cavity (1) is divided into a plurality of local heat storage units which are mutually communicated, so that a heat conduction path from heat release of the heat pipe assembly (2) to the inside of the phase change material in a condensation section is shortened, and local migration and thermal layering of the liquid phase change material under an overload working condition are restrained.
  2. 2. The synergistic phase change uniform Wen Xingre buffer as claimed in claim 1, wherein the condensation section housing of the heat pipe assembly (2), the base body of the heat storage cavity (1) and the three-dimensional fractal tree rib structure (4) are integrally formed by additive manufacturing to form a continuous metal heat conduction path between the heat pipe assembly (2) and the heat storage cavity (1) so as to reduce interface thermal resistance.
  3. 3. The synergistic phase-change uniform Wen Xingre buffer according to claim 1, characterized in that the three-dimensional fractal tree rib structure (4) follows a self-similar fractal rule, takes a topological configuration of gradual branching of main pulse-branch-tip along a direction away from the condensation section of the heat pipe assembly (2), is used for expanding heat introduced by the condensation section of the heat pipe assembly (2) to different areas of the heat storage space in a grading manner, and is used as a heat conduction framework and a crystallization nucleation framework in the melting and solidification process of the phase-change material so as to reduce the internal temperature gradient of the phase-change material and improve the temperature uniformity and the circulation stability in the heat buffering process.
  4. 4. The collaborative phase change uniform Wen Xingre buffer according to claim 3, wherein the fractal tree rib structure (4) adopts a bifurcate or multi-bifurcation form, each level of branches is gradually contracted along the heat expansion direction, the fractal dimension D is 1.5-2.5, and the fractal dimension D is: Wherein n is the number of branches of each stage; Is the fractal coefficient of diameter.
  5. 5. A collaborative phase transition uniform Wen Xingre buffer according to claim 3, characterized in that the branch lengths and diameters of each stage of the fractal tree rib structure (4) satisfy a scaling relationship: Wherein, the And The length and diameter of the ith branch respectively, And The length and diameter of the main pulse respectively, As the length fractal coefficient, Is a fractal coefficient of diameter and meets 0 < < 1,0 < < 1。
  6. 6. The collaborative phase change uniform Wen Xingre buffer according to claim 3, wherein the branching angle of the fractal tree rib structure (4) is 30-60 degrees, and the fractal order N is 2-4 orders.
  7. 7. The synergistic phase change buffer as claimed in any one of claims 1 to 6, wherein a wick structure is provided in the heat pipe assembly (2), the wick structure being a sintered wick, a grooved wick or a composite wick for maintaining the reflux capacity of the working medium under high overload or posture change conditions, thereby improving the heat transfer stability of the heat pipe assembly.
  8. 8. The synergistic phase-change uniform Wen Xingre buffer as claimed in claim 1, characterized in that the surface of the fractal tree rib structure (4) is structured as a roughened surface, a microporous surface or an additively manufactured primary roughened surface to improve heterogeneous nucleation capability and interfacial heat exchange efficiency of the phase-change material during solidification.
  9. 9. The cooperative phase change uniform Wen Xingre buffer of claim 1, wherein the liquid filling port is provided with a detachable mechanical sealing interface or a welded sealing interface for sealing the heat storage space after filling with the phase change material.
  10. 10. The synergistic phase-change uniform Wen Xingre buffer as claimed in claim 1, wherein the fractal tree rib structure (4) has a larger main pulse cross section in the area close to the condensation section of the heat pipe assembly (2), and multi-stage refinement branches are formed in the area far from the condensation section of the heat pipe assembly (2) to construct a multi-scale heat flow distribution network which is developed step by step from the center to the periphery.

Description

Collaborative phase change uniform Wen Xingre buffer with overload adaptability Technical Field The invention relates to the technical field of aerospace thermal management and high-power electronic device heat dissipation, in particular to a collaborative phase change Wen Xingre buffer suitable for high-overload and variable-working-condition environments such as an ultra-high-speed aircraft. Background In the maneuvering flight process, the near-space ultra-high-speed aircraft has an extreme thermo-force coupling environment facing to the internal guidance system, phased array radar and other precise electronic equipment. On the one hand, the instantaneous switch of the equipment generates high-frequency and high-density pulse heat flow, and on the other hand, the aircraft needs to bear a large-amplitude and variable-direction mechanical overload (supergravity) environment. The existing heat management scheme has obvious technical shortboards that a single heat pipe has extremely high equivalent heat conductivity coefficient and can realize quick heat transport, but the working principle of the single heat pipe depends on capillary force driving. Under the high overload environment, the volume force can seriously interfere with the capillary balance of a gas-liquid interface, so that liquid backflow is blocked, the capillary limit (dry failure) is extremely easy to trigger, the heat buffering capacity is lacked, and the thermal shock resistance is poor. Although a single phase change heat reservoir utilizes the latent heat of melting of materials to realize heat buffering, the phase change materials generally have the inherent defect of extremely low heat conductivity coefficient. Under high overload, natural convection is strongly inhibited, so that the melting process is dominated by heat conduction, the phase change interface is slowly pushed in, the internal temperature gradient is extremely large, the surfaces of the heat storage cavities are Wen Xingcha, and the temperature control requirement of the precision element cannot be met. Therefore, there is a need for a thermal management device that can couple rapid thermal grooming with efficient thermal buffering depths, and yet maintain a synergistic stability of gas-liquid phase transitions and solid-liquid phases in a hypergravity environment. Disclosure of Invention The invention aims to provide a collaborative phase change Wen Xingre buffer with overload adaptability, which effectively handles high heat flow density, pulse type and strong transient heat load impact. In order to solve the technical problems, the invention provides the following technical scheme: A synergistic phase change homo Wen Xingre buffer with overload adaptation, comprising: the heat storage cavity is provided with a liquid filling port through which phase change materials are filled in the heat storage cavity; The heat pipe assembly is provided with an evaporation section and a condensation section, wherein the evaporation section is arranged at a heat source, and the condensation section is at least partially embedded in the heat storage cavity; The heat storage cavity is internally provided with a three-dimensional fractal rib structure, the fractal rib structure is immersed in the phase change material, and the internal space of the heat storage cavity is divided into a plurality of local heat storage units which are mutually communicated, so that a heat conduction path from heat release of the heat pipe assembly to the inside of the phase change material in a condensation section is shortened, and local migration and thermal layering of the liquid phase change material under an overload working condition are restrained. The fractal tree rib structure follows a self-similar fractal rule, takes a topological configuration of gradual bifurcation of main pulse-branch-tip along the direction away from the condensing section of the heat pipe assembly, and is used for expanding heat introduced by the condensing section to different areas of the heat storage space in a grading manner. The fractal tree rib structure is used as a heat conduction framework in the melting process of the phase change material, is used for strengthening heat flow expansion and uniform temperature transmission, is used as a crystallization nucleation framework in the solidification process, and is used for inducing the phase change material to be uniformly solidified, so that the circulating working stability of the thermal buffer is improved. Further, the fractal tree rib structure adopts a bifurcate or multi-bifurcation form, and the fractal dimension is preferably 1.5-2.5 so as to achieve heat flow expansion covering capacity, structure specific surface area and additive manufacturing forming feasibility. Further, the lengths and the diameters of all stages of branches of the fractal tree rib structure meet a preset scaling relation, so that heat flow is expanded step by step in different scale ra