冷氦换热器传热设计及试验研究

摘要

为满足某火箭二级发动机氧贮箱增压需求,在二级发动机上设计了一种蛇形管式冷氦换热器,并对其进行传热论证.在发动机试验时搭建了一套冷氦试验系统,对冷氦换热器的性能进行试验验证,验证后修正了换热器传热系数.结果表明:冷氦换热器传热计算合理,修正后的蛇形管长度与试验基本一致.%In order to meet a rocket's second stage engine oxygen tank pressurization requirements, a cold helium heat exchanger of coiled pipe has been designed on the second stage engine, and heat transfer is demonstrated for it. A set of the cold helium test system is constructed during the engine test and the cold helium heat transfer performance is tested. After the test, coefficient of heat transfer is corrected. It verified that the cold helium heat transfer calculation is reasonable and the corrected length of the coiled pipe is consistent with the test.