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对低功率电弧加热发动机内的传热与流动过程进行了数值模拟研究,分别采用氮氢混合物模拟氨和肼作推进剂,计算获得了不同入口总压和弧电流的多种工况条件下发动机内温度和速度分布.结果表明,随着弧电流的增加,发动机出口处的温度、速度和比冲也随之增加;随着入口总压的增加,工作气体流量增加,发动机喷管出口处轴向速度增加.对NASA 1 k W级电弧加热发动机采用氮氢模拟肼作推进剂进行了数值模拟,模拟结果与文献报道的实验结果大体相符.
Numerical simulations of heat transfer and flow in a low-power arc-heated engine were carried out respectively. Nitrogen and hydrogen mixtures were used to simulate ammonia and hydrazine as propellants respectively. Under different operating conditions with different inlet total pressures and arc currents, Internal temperature and velocity distribution.The results show that with the increase of arc current, the temperature, velocity and specific impulse at the exit of the engine also increase. With the increase of inlet total pressure, the working gas flow rate increases, and the outlet of the engine nozzle The numerical simulation of NASA 1 kW arc-heated engine using nitrogen-hydrogen simulated hydrazine as propellant has been carried out. The simulation results are in good agreement with the experimental results reported in the literature.