连续波激光推力器稳定工作条件的解析计算模型

An Analytical Model for Stable Operating Conditions of Continuous Wave Laser-Sustained Plasma Thruster

连续波激光推力器工作需要稳定的等离子体以吸收激光。为得到推力器中等离子体稳定维持的参数条件,根据吸收室内绕等离子体区域流动的流场特征,考虑高温状态下工质的热物理性质、激光吸收和辐射效应,建立了推力器吸收室内的能量平衡模型,该模型包含入射激光功率、推力室压强、等离子体区核心温度以及工质质量流量等参数。计算表明,该模型所得稳定质量流量随压力、激光功率的变化趋势与实验结果一致,并解释了稳定质量流量区间存在的原因。

The operation of a continuous-wave laser-sustained plasma thruster requires the stable plasma to absorb laser. To get the parameter conditions for the stable plasma maintenance, the flow-field characteristic around a plasma region in the absorption-chamber is considered, as well as high-temperature thermophysics properties of the propellant, laser absorption and radiation effect. Then an energy equilibrium model is obtained, including chamber pressure, laser power, the plasma core temperature and mass rate of the propellant. Calculations show that the trend of stable mass rate for different pressures and laser powers is consistent with the experiment. And the existence of the stable mass rate zone can be primarily explained.