论文部分内容阅读
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。
The numerical simulation method was used to analyze the gas flow in the low-power nitrogen-hydrogen arc heated engine. According to the gas flow characteristics in the engine, the definition method of the thermal boundary layer and the flow boundary layer in the arc-heated engine was investigated. Mainstream areas and boundaries within the energy conversion process. The research shows that in the engine restraint channel, the heat energy of the arc is mainly converted into the heat energy of the gas in the main flow area to increase the enthalpy of the gas. In the arc attachment area of the expansion section of the engine nozzle, the arc heating serves to lift the gas in the boundary layer Enthalpy and kinetic energy.Further analysis shows that reducing the confined channel diameter and increasing the operating current all contribute to the increase of the contribution of gas in the main flow zone to the thrust so as to improve the performance of the engine.