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Effect of Segmented Electrode Length on the Performances of an Aton-Type Hall Thruster 被引量:2
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作者 段萍 边兴宇 +3 位作者 曹安宁 刘广睿 陈龙 殷燕 《Plasma Science and Technology》 SCIE EI CAS CSCD 2016年第5期525-530,共6页
The influences of the low-emissive graphite segmented electrode t)laeed near the channel exit on the discharge characteristics of a Hall thruster are studied using the particle- in-cell method. A two-dimensional phys... The influences of the low-emissive graphite segmented electrode t)laeed near the channel exit on the discharge characteristics of a Hall thruster are studied using the particle- in-cell method. A two-dimensional physical model is established according to the Hall thruster discharge channel configuration. The effects of electrode length on the potential, ion density, electron temperature, ionization rate and discharge current are investigated. It is found that, with tile increasing of the segmented electrode length, the equipotential lines bend towards the channel exit. and approximately parallel to the wall at the channel surface, the radial velocity and radial flow of ions are increased, and the electron temperature is also enhanced. Due to the conductive characteristic of electrodes, the radial electric field and the axial electron conductivity near the wall are enhanced, and the probability of the electron-atom ionization is reduced, which leads to the degradation of the ionization rate in the discharge channel. However, the interaction between electrons and the wall enhances the near wall conductivity, therefore the discharge current grows along with the segmented electrode length, and the performance of the thruster is also affected. 展开更多
关键词 Hall thruster segmented electrodes PARTICLE-IN-CELL ionization rate
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霍尔推力器分割高偏压电极等离子体放电特性 被引量:1
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作者 李文庆 段萍 +3 位作者 胡翔 宋继磊 边兴宇 陈龙 《中国空间科学技术》 EI CSCD 北大核心 2018年第5期17-29,共13页
霍尔推力器通道等离子体与壁面有很强的相互作用,为了降低壁面腐蚀,提高在轨寿命,针对推力器全通道放电过程建立二维物理模型,采用粒子模拟方法(Particle-In-Cell),数值研究了电离区壁面分割高于阳极偏压的低发射石墨电极对推力器放电... 霍尔推力器通道等离子体与壁面有很强的相互作用,为了降低壁面腐蚀,提高在轨寿命,针对推力器全通道放电过程建立二维物理模型,采用粒子模拟方法(Particle-In-Cell),数值研究了电离区壁面分割高于阳极偏压的低发射石墨电极对推力器放电特性的影响,讨论了放电通道电势、离子数密度、电子温度、电离速率及比冲的变化规律。结果表明:在电离区不同位置分割高偏压电极对等离子体放电特性影响明显,电极位置在电离区前端时,电极偏压高于阳极电压60V时通道内放电等离子体参数几乎不变。而电极位置在电离区末端,电极偏压高于阳极电压18V时就会导致加速区轴向扩张,离子聚焦效果强,电子温度显著升高,电子与壁面相互作用减弱,羽流发散角减小。由此推力器比冲提升约12%,寿命延长,性能提高。 展开更多
关键词 霍尔推力器 分割电极 电极偏压 粒子模拟 壁面材料
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Study on the influences of ionization region material arrangement on Hall thruster channel discharge characteristics 被引量:3
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作者 胡翔 段萍 +3 位作者 宋继磊 李文庆 陈龙 边兴宇 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第2期47-55,共9页
There exists strong interaction between the plasma and channel wall in the Hall thruster,which greatly affects the discharge performance of the thruster.In this paper,a two-dimensional physical model is established ba... There exists strong interaction between the plasma and channel wall in the Hall thruster,which greatly affects the discharge performance of the thruster.In this paper,a two-dimensional physical model is established based on the actual size of an Aton P70 Hall thruster discharge channel.The particle-in-cell simulation method is applied to study the influences of segmented low emissive graphite electrode biased with anode voltage on the discharge characteristics of the Hall thruster channel.The influences of segmented electrode placed at the ionization region on electric potential,ion number density,electron temperature,ionization rate,discharge current and specific impulse are discussed.The results show that,when segmented electrode is placed at the ionization region,the axial length of the acceleration region is shortened,the equipotential lines tend to be vertical with wall at the acceleration region,thus radial velocity of ions is reduced along with the wall corrosion.The axial position of the maximal electron temperature moves towards the exit with the expansion of ionization region.Furthermore,the electron-wall collision frequency and ionization rate also increase,the discharge current decreases and the specific impulse of the Hall thruster is slightly enhanced. 展开更多
关键词 Hall thruster segmented electrode particle-in-cell wall material
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Effect of the Discharge Voltage on the Performance of the Hall Thruster
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作者 段萍 刘广睿 +3 位作者 边兴宇 陈龙 殷燕 曹安宁 《Plasma Science and Technology》 SCIE EI CAS CSCD 2016年第4期382-387,共6页
In this paper,a two-dimensional physical model is established according to the discharging process in the Hall thruster discharge channel using the particle-in-cell method.The influences of discharge voltage on the di... In this paper,a two-dimensional physical model is established according to the discharging process in the Hall thruster discharge channel using the particle-in-cell method.The influences of discharge voltage on the distributions of potential,ion radial flow,and discharge current are investigated in a fixed magnetic field configuration.It is found that,with the increase of discharge voltage,especially during 250-650 V,the ion radial flow and the collision frequency between ions and the wall are decreased,but the discharge current is increased.The electron temperature saturation is observed between 400-450 V and the maximal value decreases during this region.When the discharge voltage reaches 700 V,the potential distribution in the axis direction expands to the anode significantly,the ionization region becomes close to the anode,and the acceleration region grows longer.Besides,ion radial flow and the collision frequency between ions and the wall are also increased when the discharge voltage exceeds 650 V. 展开更多
关键词 Hall thruster particle-in-cell discharge voltage discharge efficiency
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