微推力器柱阵列加热室流动和换热特性研究

摘要

针对丁烷自增压微推力器,设计了微型圆柱阵列结构加热室,通过数值模拟的方法研究了给定加热功率,不同的加热室入口压力下,微柱阵列排列结构对加热室内丁烷气体的流动和换热特性以及微推力器性能的影响.结果表明,微柱阵列的存在明显的提升了加热室换热特性和推力器性能,微柱阵列引起的加热室压力损失很小.相同的排列密度下,采用错排列结构微柱阵列的推力器整体性能更优.微柱阵列的排列密度越大,微推力器加热室换热特性和性能越好.当微柱阵列采用错排列结构时,排列密度增至一定程度后推力器性能不再提升.%A heating chamber with micro column pin-fin array structure was designed for the butane self-pressurized micro-thruster. Under the given heating power and the different inlet pressure of heating chamber, the effects of micro-column pin-fin arrangement structure on the flow and heat transfer charac-teristic of butane gas in the heating chamber were studied by numerical simulation as well as the propul-sion performance of the micro-thruster. The results show that the micro-column pin-fin array can signifi-cantly increase the heating efficiency of heating chamber and thruster performance, while its pressure loss at the heating chamber is quite small. Under the same arrangement density, the thruster with a staggered pin-fin arrangement has better overall performance. The more the arrangement density is, the better the heat transfer characteristics and propulsive performance of the micro-thruster become. However, when the staggered arrangement is adopted for the micro-column array, the thruster performance is not further im-proved once the arrangement density increases to a certain degree.