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环路热管是目前航天器热控制领域最前沿的热控技术之一,而高性能的毛细芯是其高效可靠运行的保证.为不断提升毛细芯的综合性能,目前毛细芯由单一结构向着复合结构发展.建立了圆柱型蒸发器环路热管应用的双层复合结构毛细芯的数学模型,对其传热与流动特性进行了分析,重点考察了热载荷以及复合芯内外层厚度比的影响,并同单一结构的毛细芯进行了比较.分析结果表明:复合芯在获得高的毛细抽吸力和蒸发效率的同时,可实现低的流通阻力与径向热导,其传热与压降特性明显优于单层芯,是高性能毛细芯的发展趋势;当复合芯的整体尺寸一定时,复合芯内外层的厚度比越大,复合芯的径向热导和流通阻力越小,有利于提高环路热管的运行性能.
Loop heat pipe is one of the most advanced thermal control technologies in the field of thermal control of spacecraft, and high-performance capillary wick is the guarantee of its efficient and reliable operation.In order to continuously improve the overall performance of capillary wick, Structure development.The mathematical model of capillary structure of double-layer composite structure with cylindrical evaporator loop heat pipe was established and its heat transfer and flow characteristics were analyzed. The effects of thermal load and thickness ratio of inner and outer layers of composite core were investigated emphatically. The results show that the composite core can achieve low flow resistance and radial thermal conductivity with high capillary suction and evaporation efficiency, and its heat transfer and pressure drop characteristics Which is obviously better than single-layer core. It is the development trend of high-performance capillary core. When the overall size of the composite core is constant, the greater the thickness ratio of the inner and outer layers of the composite core, the smaller the radial thermal conductivity and flow resistance of the composite core, Improve the performance of loop heat pipe.