氢-氮电弧加热推力器运行参数与性能

Low power H_2-N_2 arcjet thruster operation and performance

采用氢气和氮气的摩尔比r在1.0-2.0范围的混合气体作为推进剂，实时检测电弧加热推力器运行中的弧电流、弧电压、人口压力、真空室压力、质量流量和喷口温度等工作参数，研究了比功率、r和质量流量对推力器产生的推力、比冲和推力效率的影响。实验结果表明，同时增加混合气体的质量流量和r能有效提高推力器的推力；较高的r能获得高的比冲和效率，尤其是比冲随着r的提高明显地单调上升。

Gas mixtures of hydrogen and nitrogen with the mole ratio （r） between 1.0-2.0 were used as the propellant, and operation parameters, such as arc current, arc voltage, inlet pressure, chamber pressure, gas flow rates and nozzle temperature, were measured in-situ. The dependence of the thrust, specific impulse and efficiency on the specific power, r and total mass flow rate of the propellant were analyzed. Results showed that the thrust increases appreciably at high mass flow rate together with high r. However, for the improvement of specific impulse and efficiency, high r plays a more important role. Especially, the specific impulse increases significantly with the increasing r.