基于回热器效能与阻力特性的空间逆布雷顿制冷机性能优化OA

With the development of space missions,the demand for cryogenic high-capacity space reverse Brayton cryocoolers in the tens of watts range has become increasingly urgent,while the efficient design of their key components still faces numerous challenges.As a core component,the cryogenic recuperator directly determines the refrigeration performance of the system while accounting for a major portion of the system's weight.Therefore,in-depth research on the impact of recuperator performance on the system and achieving efficient and compact design is of great significance for advancing space refrigeration technology.The recuperator solutions for a 70 W@70 K space reverse Brayton cryocooler are investigated,with quantitative analysis of their performance impact on the cryocooler system.The study shows that the heat transfer and flow properties of the regenerator have a significant impact on the system's cooling output.Based on this,this paper proposes a high-efficiency cryogenic regenerator design using a high-density microfin structure.This structure exhibits excellent compactness,with a specific surface area exceeding 4435 m²/m³.Cryogenic experimental validation demonstrates superior performance,with heat transfer effectiveness ranging from 96.7%—97.4%.Through comprehensive comparative analysis with existing solutions,the proposed micro-pin-fin recuperator achieves 82.6%volume reduction and 63.9%weight savings compared to the compact plate-fin heat exchangers widely used in cryocoolers.Under identical volume constraints,it exhibits significantly enhanced thermal-hydraulic performance with a performance evaluation criterion(PEC)exceeding 2.9.Furthermore,the influence of micro-pin-fin structural parameters on both recuperator performance and system cooling capacity is systematically analyzed,providing guidance for design optimization.