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研制了一套双静电探针测量系统,对以氩气为推进剂的1kW级电弧加热发动机羽流进行了测量,得到了电子温度和电子数密度的轴向和径向分布,以及随弧电流、气流量的变化趋势。结果表明,羽流显著偏离局域热力学平衡状态,电子温度呈现复杂的分布和变化趋势。羽流轴线上的电子温度明显低于偏离轴线处的值,而电子数密度远高于偏离轴线处的值;羽流轴线上的电子温度随弧电流的增加而降低,电子数密度随弧电流的增加而增加;羽流中心区电子温度随气流量的变化趋势不明显。
A set of double electrostatic probe measurement system was developed. The plume of 1kW arc heated engine with argon propellant was measured. The axial and radial distributions of electron temperature and electron density were obtained, , The trend of changes in gas flow. The results show that the plume deviates significantly from the local thermodynamic equilibrium, and the electron temperature shows a complex distribution and trend. The electron temperature on the plume axis is significantly lower than the off-axis value, while the electron density is far higher than the off-axis value. The electron temperature on the plume axis decreases with the increase of arc current, The increase of electron temperature in the center of plume is not obvious with the increase of gas flow.