栅极组件热变形是影响离子推力器工作性能及工作寿命的主要因素, 为研究栅极组件升温过程中温度场分布及变化规律, 探索能较准确模拟栅极温度场的方法, 建立了栅极组件1/12全尺寸有限元模型进行温度场仿真计算。同时, 基于实验室搭建的温度测量平台, 测量了大气环境下加热时栅极组件的瞬态温度变化。对比有限元分析求解与试验过程中的温度场, 加速栅平均误差为14.4%, 屏栅平均误差为9.7%, 双栅最大误差不超过18.4%, 验证了有限元模型及方法的可信度和合理性。

The thermal deformation of grids assembly is the main factor affecting the working performance and working life of the ion thruster. In order to study the distribution and variation of the temperature field in the process of grids assembly heating, the method of accurately simulating the grid temperature field is explored. The full size finite element model of the 1/12 grids assembly is established for the heat transfer analysis. Meanwhile, the temperature measurement platform built in the laboratory, the transient temperature changes of the grids assembly in the atmosphere are measured. Comparison between the finite element analysis and test results shows that, the average error of the accelerated grid is 14.4%, the average error of the screen grid is 9.7%, the maximum error of two grids is less than 18.4%, and the credibility and rationality of the finite element model and the method is verified.