中国空间科学技术2016，Vol.36Issue(3)：15-23,9.DOI:10.16708/j.cnki.1000-758X.2016.0035
低功率氮氢电弧加热发动机非平衡数值模拟
Non-equi l ibrium numerical simulation of a low power nitrogen/hydrogen arcjet
摘要
Abstract
Thermal and chemical nonequi librium modelings study were performed on a low power nitrogen/hydrogen arcjet.Separate energy equations were formulated for the electrons and total species, and seven-species nitrogen/hydrogen plasma composition of molecules, atoms, ions and electrons was assumed. Some important chemical kinetic processes of dissociation and ionization were considered in the chemical nonequi librium model.The plasma properties were calculated according to the local species number density and temperature. The distribution of temperature and the number density of each species in the arcjet were obtained. The results show that the axis of arcjet is close to thermal equi librium and significant deviation from thermal equi librium is found in the arc attachment region. It is shown that the species distributions of nitrogen and hydrogen are significantly different from those at the inlet of thruster,which indicates that there exist the demixing processes inside thruster.It is found that the hydrogen species decrease at fi rst and then increase along the radial di rection from the center to the inner wall of thruster,whi le the nitrogen components show the opposite trend.Further analysis shows that the species diffusions inside arcjet are driven by mole fraction gradients which are due to the dissociation and ionization of nitrogen and hydrogen species.关键词
氮氢电弧加热发动机/非平衡/数值模拟/化学动力学/电推进Key words
nitrogen/hydrogen arcjet/non-equi librium/numerical simulation/chemical kinetics/electric propulsion分类
航空航天引用本文复制引用
魏延明,何青松,王海兴..低功率氮氢电弧加热发动机非平衡数值模拟[J].中国空间科学技术,2016,36(3):15-23,9.基金项目
国家自然科学基金(11575019,11275021) （11575019,11275021）
民用航天项目(混合模式推进系统优化技术) （混合模式推进系统优化技术）
