离子推力器C-C复合栅多工况热态微位移研究  

Study on Thermal Micro-Displacement of Ion Thruster C-C Composite Grid under Multiple Conditions

作　　者：高斌[1] 李娟[1] 陈娟娟[1] 李如月 王彦龙[1] GAO Bin;LI Juan;CHEN Juan-juan;LI Ru-yue;WANG Yan-long(Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,China)

机构地区：[1]兰州空间技术物理研究所真空技术与物理重点实验室,甘肃兰州730000

出　　处：《真空》2024年第5期90-96,共7页Vacuum

基　　金：国家自然科学基金(No.62371213);甘肃省自然科学基金项目(No.22JR5RA784)。

摘　　要：针对LIPS-100离子推力器C-C一体化复合栅极组件设计问题,利用热特性计算模型开展栅极热力学特性研究。采用Workbench瞬态热分析法研究了两种曲面朝向的C-C栅极热性能参数,并与传统金属钼栅进行了对比分析。结果表明:等工况、等球面构型、等栅间距条件下,C-C复合栅较钼栅组件质量减轻35.7%,热态分析温度上限降低19.6%,升温速率降低21.3%;C-C复合屏栅较钼栅微位移减小0.151 mm,加速栅微位移减小0.123 mm,具有更高的抗热冲击性,可有效缓解推力器工作前期栅间距波动较大的问题;同一C-C复合栅材料下,球面朝向结构不同,栅极中心-开孔区边缘热态微位移不同,凸型栅较凹型栅加速栅微位移量降低0.025~0.038 mm,可有效提升加速栅开孔区磨损寿命。对于小尺寸离子推力器,凸面C-C复合栅组件抗热冲击性优势明显。Aiming at the design of C-C integrated composite grid module of LIPS-100 ion thruster,the thermodynamic characteristics of the grid were studied by using the thermal characteristics calculation model.Using Workbench transient thermal analysis method,the thermal performance parameters of two kinds of C-C gates with different curved surface orientation were analyzed,and compared with the traditional metal molybdenum gate.The results show that under the conditions of equal working conditions,equal spherical configuration and equal gate spacing,the weight of C-C composite gate is reduced by 35.7%,the upper limit of thermal analysis temperature is reduced by 19.6%,and the heating rate is reduced by 21.3%.Compared with molybdenum grid,the displacement of C-C composite screen grid is reduced by 0.151 mm,and the displacement of acceleration gate is reduced by 0.123 mm.The C-C composite screen grid has higher thermal shock resistance and can effectively alleviate the problem of gate spacing fluctuation in the early stage of thruster operation.Under the same composite gate material,when the spherical orientation structure is different,the grid center-edge thermal micro-displacement is different,the acceleration gate micro-displacement of convex gate is reduced by 0.025-0.038 mm compared to that of the concave gate,which can effectively improve the wear life of the acceleration gate zone.For small size ion thruster,convex grid has obvious advantages in thermal shock resistance.

关 键 词：离子推力器 栅极组件 C-C复合材料 热形变位移 

分 类 号：V439.4[航空宇航科学与技术—航空宇航推进理论与工程]