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为了研究磁场对霍尔推力器壁面侵蚀的影响,利用轮廓仪测量霍尔推力器内外壁面工作30h的侵蚀状况,对比聚焦磁场和发散磁场条件下的推力器壁面侵蚀过程,分析了聚焦磁场改善壁面侵蚀的方式和程度,并进行了机理分析。实验结果表明:在经过30h的实验后,聚焦磁场相对于发散磁场内陶瓷壁面侵蚀深度降低33%,外陶瓷壁面侵蚀深度降低18.6%。理论分析表明:在羽流发散半角小于30°以内时,溅射系数随羽流发散半角增大而增大,将羽流发散半角控制在小于30°以内的“磁聚焦”模式,能够有效降低离子对壁面的侵蚀,进而可提高推力器寿命。
In order to study the influence of magnetic field on the wall erosion of Hall thruster, the erosion situation of Hall thruster inner and outer wall surface was measured by profilometer for 30h. Contrasting the thruster wall erosion process under the condition of focusing magnetic field and divergent magnetic field, The way and extent of erosion, and carried out a mechanism analysis. The experimental results show that after 30 hours of experiment, the depth of the focused magnetic field is reduced by 33% with respect to the depth of the ceramic wall surface in the divergent magnetic field, and the depth of erosion by the outer ceramic wall is reduced by 18.6%. The theoretical analysis shows that when the plume divergence angle is less than 30 °, the sputtering coefficient increases with the increase of plume divergence half angle, and the plume divergence half angle is controlled within less than 30 ° magnetic focusing mode Effectively reduce the erosion of ions on the wall, which can improve the life of the thruster.