中文摘要：

采用数值模拟的方法对低功率氮氢电弧加热发动机内的气体流动状况进行了分析研究,根据发动机内气体流动特性,确定了电弧加热发动机内的热边界层和流动边界层的定义方法,考察了主流区和边界内的能量转化过程。研究表明,在发动机约束通道内,电弧的热能主要在主流区转化为气体的热能,提升气体的焓值,而在发动机喷管扩张段的电弧贴附区域,电弧加热起到提升边界层内气体焓值和动能的作用.进一步的分析表明,缩小约束通道直径以及增加工作电流都有助于增加主流区气体对推力的贡献,从而提高发动机的性能。

英文摘要：

Modeling study is conducted to investigate the characteristics of gas flow in nitrogen/hydrogen mixture arcjet.According to the characteristics of the gas flow in the arcjet,the definition methods of the thermal boundary layer and the flow boundary layer in the arcjet are determined.The energy conversion process between main stream and boundary layer is discussed.The results show that the arc thermal energy is mainly converted into the gas thermal energy in the main stream of the constrictor,and the gas enthalpy is promoted.In the arc attachment region,the arc heating raises the enthalpy and kinetic energy of gas in boundary layer.Further study shows that reduction of constrictor length and increase of working current will improve the contribution of the main stream thrust to the total thrust,so as to improve the performance of the arcjet.