使用热流传感器对氙离子推力器轴向距离为500、700 mm和900 mm,径向角度为0°~15°(推力器出口平面中心为圆心,推力器出口轴线为0°)范围内羽流热流密度的分布进行了实验研究,获得了热流随角度和半径变化的实验数据。采用PI...使用热流传感器对氙离子推力器轴向距离为500、700 mm和900 mm,径向角度为0°~15°(推力器出口平面中心为圆心,推力器出口轴线为0°)范围内羽流热流密度的分布进行了实验研究,获得了热流随角度和半径变化的实验数据。采用PIC-DSMC (particle in cell direct simulation of Monte Carlo)算法在不同适应系数下对实验条件进行仿真分析,对比仿真结果和实验结果得到适应系数。结果表明:keV能量的Xe粒子对热流传感器表面(铜)的适应系数接近1。展开更多
Reducing the influence of back-sputtering effect can effectively improve the accuracy of the measurement of the Hall thruster plume effect.Quartz crystal microbalance(QCM)was used to measure the deposition and sputter...Reducing the influence of back-sputtering effect can effectively improve the accuracy of the measurement of the Hall thruster plume effect.Quartz crystal microbalance(QCM)was used to measure the deposition and sputtering distribution of HET-40 thruster plume on two different experimental conditions:case1,using liquid nitrogen heat sinks and case 2,without using liquid nitrogen heat sinks.Meanwhile,X-ray photoelectron spectroscopy(XPS)was used to analyze the composition of the QCM surface after two experiments.The results of the two experiments showed that the sputtering rate under the condition of case 1 was slightly higher than case 2.Especially within the range of 90°to 110°relative to the thruster axis,case 1 experiment result showed sputtering effect,while case 2 experiment showed deposition effect.Through analysis of the experimental results,it can be found that using liquid nitrogen heat sink to reduce the temperature of the inner wall surface of vacuum chamber can effectively adsorb the particles sputtered by the plume and reduce the concentration of back-sputtering particles,leading to the above phenomenon.展开更多
文摘使用热流传感器对氙离子推力器轴向距离为500、700 mm和900 mm,径向角度为0°~15°(推力器出口平面中心为圆心,推力器出口轴线为0°)范围内羽流热流密度的分布进行了实验研究,获得了热流随角度和半径变化的实验数据。采用PIC-DSMC (particle in cell direct simulation of Monte Carlo)算法在不同适应系数下对实验条件进行仿真分析,对比仿真结果和实验结果得到适应系数。结果表明:keV能量的Xe粒子对热流传感器表面(铜)的适应系数接近1。
文摘Reducing the influence of back-sputtering effect can effectively improve the accuracy of the measurement of the Hall thruster plume effect.Quartz crystal microbalance(QCM)was used to measure the deposition and sputtering distribution of HET-40 thruster plume on two different experimental conditions:case1,using liquid nitrogen heat sinks and case 2,without using liquid nitrogen heat sinks.Meanwhile,X-ray photoelectron spectroscopy(XPS)was used to analyze the composition of the QCM surface after two experiments.The results of the two experiments showed that the sputtering rate under the condition of case 1 was slightly higher than case 2.Especially within the range of 90°to 110°relative to the thruster axis,case 1 experiment result showed sputtering effect,while case 2 experiment showed deposition effect.Through analysis of the experimental results,it can be found that using liquid nitrogen heat sink to reduce the temperature of the inner wall surface of vacuum chamber can effectively adsorb the particles sputtered by the plume and reduce the concentration of back-sputtering particles,leading to the above phenomenon.