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应用静电单探针测量了kW级电弧加热发动机喷出等离子体参数分布。发动机以氮气为推进剂,测量范围为距离发动机喷口1.25～15cm,实验中真空舱压力为3～5Pa。实验获得了电子温度和电子数密度沿不同轴向位置和径向位置的变化规律,电子温度为0.4～0.8eV,电子数密度为1.2×1017～1.25×1018m-3。对比研究发现,N2为推进剂产生的等离子体的电子温度和电子数密度均大于N2-H2为推进剂的情况,但前者发散角较小。
Electrostatic single probe was used to measure the plasma parameters distribution of a kW-class arc heated engine. Engine with nitrogen as a propellant, the measurement range of 1.25 ~ 15cm from the engine orifice, the experiment vacuum chamber pressure of 3 ~ 5Pa. The variation of electron temperature and electron density along different axial positions and radial positions were obtained. The electron temperature was 0.4 ~ 0.8eV and the electron density was 1.2 × 1017 ~ 1.25 × 1018m-3. The comparative study found that the electron temperature and electron density of the plasma generated by N2 propellant are greater than that of N2-H2 propellant, but the divergence angle of the former is smaller.