Due to a series of challenges such as low-orbit maintenance of satellites, the air-breathing electric propulsion has got widespread attention. Commonly, the radio frequency ion thruster is favored by low-orbit mission...Due to a series of challenges such as low-orbit maintenance of satellites, the air-breathing electric propulsion has got widespread attention. Commonly, the radio frequency ion thruster is favored by low-orbit missions due to its high specific impulse and efficiency. In this paper, the power transfer efficiency of the radio frequency ion thruster with different gas compositions is studied experimentally, which is obtained by measuring the radio frequency power and current of the antenna coil with and without discharge operation. The results show that increasing the turns of antenna coils can effectively improve the radio frequency power transfer efficiency, which is due to the improvement of Q factor. In pure N_2 discharge,with the increase of radio frequency power, the radio frequency power transfer efficiency first rises rapidly and then exhibits a less steep increasing trend. The radio frequency power transfer efficiency increases with the increase of gas pressure at relatively high power, while declines rapidly at relatively low power. In N_(2)/O_(2) discharge, increasing the N_(2) content at high power can improve the radio frequency power transfer efficiency, but the opposite was observed at low power. In order to give a better understanding of these trends, an analytic solution in limit cases is utilized, and a Langmuir probe was employed to measure the electron density. It is found that the evolution of radio frequency power transfer efficiency can be well explained by the variation of plasma resistance, which is related to the electron density and the effective electron collision frequency.展开更多
栅极系统是离子推力器的主要组件,其透过率特性对推力器的效率和推力具有重要影响.为了进一步优化栅极性能和有效评估离子推力器效率,对离子推力器栅极透过率径向分布进行研究.采用particle-In-CellMonte Carlo Collision数值仿真方法...栅极系统是离子推力器的主要组件,其透过率特性对推力器的效率和推力具有重要影响.为了进一步优化栅极性能和有效评估离子推力器效率,对离子推力器栅极透过率径向分布进行研究.采用particle-In-CellMonte Carlo Collision数值仿真方法对束流引出过程进行了模拟.分析了屏栅、加速栅以及栅极系统的透过率随栅孔引出束流离子数量的变化关系,结合放电室出口离子密度分布,进而分别得到屏栅透过率、加速栅透过率和栅极系统透过率的径向分布特性,最后进行实验验证.研究结果表明:屏栅透过率径向分布具有中心对称性,在推力器中心有最小值,从中心沿着径向逐渐增大;加速栅透过率径向分布与屏栅透过率变化趋势相反;栅极系统透过率受加速栅透过率的影响很小,其径向分布与屏栅透过率径向分布相近;离子推力器栅极总透过率随着束流增大而缓慢减小.研究结果可为离子推力器栅极优化提供参考.展开更多
利用试验和数值模拟相结合的方法研究6 cm Kaufman离子推力器放电电压和屏栅电压的变化对其工作性能的影响。试验中,离子推力器使用氩气作为推进剂,测量了多组不同工况下的性能参数。此外,基于Goebel的理论模型模拟了放电电压对束流电...利用试验和数值模拟相结合的方法研究6 cm Kaufman离子推力器放电电压和屏栅电压的变化对其工作性能的影响。试验中,离子推力器使用氩气作为推进剂,测量了多组不同工况下的性能参数。此外,基于Goebel的理论模型模拟了放电电压对束流电流和推进剂利用率的影响;采用单元内粒子-蒙特卡罗碰撞(PIC-MCC)方法模拟屏栅电压对束流电流、推进剂利用率和加速栅极电流的影响。试验和数值模拟结果一致,发现当放电电压逐渐增大时,引出的束流电流和推进剂利用率先增加然后趋于稳定;当屏栅电压逐渐增大时,引出的束流电流和推进剂利用率先增加然后趋于稳定,加速栅极电流先减小后趋于稳定。研究可以为提高多模式离子推力器的性能提供参考。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12005031 and 12275041)the Natural Science Fund from the Interdisciplinary Project of Dalian University(Grant No.DLUXK-2023-QN-001)。
文摘Due to a series of challenges such as low-orbit maintenance of satellites, the air-breathing electric propulsion has got widespread attention. Commonly, the radio frequency ion thruster is favored by low-orbit missions due to its high specific impulse and efficiency. In this paper, the power transfer efficiency of the radio frequency ion thruster with different gas compositions is studied experimentally, which is obtained by measuring the radio frequency power and current of the antenna coil with and without discharge operation. The results show that increasing the turns of antenna coils can effectively improve the radio frequency power transfer efficiency, which is due to the improvement of Q factor. In pure N_2 discharge,with the increase of radio frequency power, the radio frequency power transfer efficiency first rises rapidly and then exhibits a less steep increasing trend. The radio frequency power transfer efficiency increases with the increase of gas pressure at relatively high power, while declines rapidly at relatively low power. In N_(2)/O_(2) discharge, increasing the N_(2) content at high power can improve the radio frequency power transfer efficiency, but the opposite was observed at low power. In order to give a better understanding of these trends, an analytic solution in limit cases is utilized, and a Langmuir probe was employed to measure the electron density. It is found that the evolution of radio frequency power transfer efficiency can be well explained by the variation of plasma resistance, which is related to the electron density and the effective electron collision frequency.
文摘栅极系统是离子推力器的主要组件,其透过率特性对推力器的效率和推力具有重要影响.为了进一步优化栅极性能和有效评估离子推力器效率,对离子推力器栅极透过率径向分布进行研究.采用particle-In-CellMonte Carlo Collision数值仿真方法对束流引出过程进行了模拟.分析了屏栅、加速栅以及栅极系统的透过率随栅孔引出束流离子数量的变化关系,结合放电室出口离子密度分布,进而分别得到屏栅透过率、加速栅透过率和栅极系统透过率的径向分布特性,最后进行实验验证.研究结果表明:屏栅透过率径向分布具有中心对称性,在推力器中心有最小值,从中心沿着径向逐渐增大;加速栅透过率径向分布与屏栅透过率变化趋势相反;栅极系统透过率受加速栅透过率的影响很小,其径向分布与屏栅透过率径向分布相近;离子推力器栅极总透过率随着束流增大而缓慢减小.研究结果可为离子推力器栅极优化提供参考.
文摘利用试验和数值模拟相结合的方法研究6 cm Kaufman离子推力器放电电压和屏栅电压的变化对其工作性能的影响。试验中,离子推力器使用氩气作为推进剂,测量了多组不同工况下的性能参数。此外,基于Goebel的理论模型模拟了放电电压对束流电流和推进剂利用率的影响;采用单元内粒子-蒙特卡罗碰撞(PIC-MCC)方法模拟屏栅电压对束流电流、推进剂利用率和加速栅极电流的影响。试验和数值模拟结果一致,发现当放电电压逐渐增大时,引出的束流电流和推进剂利用率先增加然后趋于稳定;当屏栅电压逐渐增大时,引出的束流电流和推进剂利用率先增加然后趋于稳定,加速栅极电流先减小后趋于稳定。研究可以为提高多模式离子推力器的性能提供参考。
