化学微推冲阵列传热过程数值模拟

根据燃烧传热原理,建立了阵列单元燃烧传热过程的一维有限差分模型,运用此模型对装填斯蒂酚酸铅的7740玻璃、环氧树脂、微晶玻璃和硅药室单元燃烧40～80 ms过程中室壁温度成长和温度分布进行了数值模拟.结果表明,药室材料的导热系数和单元燃烧时间是影响温度成长和推冲单元分布的主要因素.低导热系数和短燃烧时间有利于提高相同面积上推冲单元的分布数.其中单元燃烧时间影响更大,导热系数增加100～1000倍时,热量传导的临界距离增加3.3～6.3倍,而燃烧时间增加一倍时,临界距离增加3～5倍,但都在微米级,硅药室为150～450 μm,其余三种为20～160 μm.

Numerical Simulation of Array Heat Transfer of Chemical Microthruster

Based on the mechanism of heat transfer,a one-dimensional finite difference model describing combustion process and array heat transfer of chemical microthruster was established.With this model,the temperature growth process and temperature distribution of unit wall of epoxy resin,7740# glass,microcrystal glass and silicon units filled with lead styphnate were obtained by numerical simulation.Results show that heat conductivity and combustion time of microthruster unit are the main factors affecting growth ...