离子推力器栅极组件温度场仿真分析及试验研究

梁秀强; 袁杰红; 周仕明

doi:10.11884/HPLPB201830.180208

离子推力器栅极组件温度场仿真分析及试验研究

doi: 10.11884/HPLPB201830.180208

国防科技大学空天科学学院, 长沙 410073

基金项目:

真空低温技术与物理国家级重点实验室开放基金项目 ZWK_1702

详细信息

作者简介:
梁秀强(1993—)，男，硕士研究生，主要从事结构失效分析与优化的研究；liangxiuqiang1993@163.com

中图分类号: V439.4
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出版历程
- 收稿日期: 2018-07-31
- 修回日期: 2018-09-23
- 刊出日期: 2018-11-15

Simulation and experimental study on temperature field of ion thruster's grids assembly

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

摘要

摘要: 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。
- 离子推力器 /
- 栅极组件 /
- 温度场 /
- 有限元模型 /
- 热分析
Abstract: 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.
- ion thruster /
- grids assembly /
- temperature field /
- FEM model /
- thermal analysis

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图 1 栅极组件有限元模型

Figure 1. FEM model of grids assembly

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图 2 加热设备

Figure 2. Heating equipment

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图 3 测温设备及测温点

Figure 3. Temperature measuring equipment and points

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图 4 栅极组件8 s的温度分布云图

Figure 4. Transient temperature field of grids assembly at 8 s

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图 5 栅极组件800 s的温度分布云图

Figure 5. Transient temperature field of grids assembly at 800 s

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图 6 各时刻温度沿径向坐标分布曲线

Figure 6. Temperature distribution along radial axis

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图 7 T₁至T₅测温点温度变化曲线及稳态温度分布曲线

Figure 7. Experiment and simulation results of termocouple points T₁ to T₅ and steady-state temperature distribution

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表 1 各加热管表面温度

Table 1. Surface temperature of heating tubes

heating tube number	temperature/℃
1	635
2	608
3	512
4	455
5	422

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表 2 加速栅测温点稳态温度试验与仿真对比

Table 2. Comparison of steady-state temperature between simulation and experiment for accelerator grid

thermocouple point	temperature of FEM/℃	temperature of experiment/℃	error /%
T₁	176	198	11.1
T₂	175	202	13.4
T₃	155	190	18.4
T₄	130	154	16.0
T₅	110	124	11.3

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表 3 屏栅测温点稳态温度试验与仿真对比

Table 3. Comparison of steady-state temperature between simulation and experiment for screen grid

thermocouple point	temperature of FEM/℃	temperature of experiment/℃	error /%
T₁	284	322	11.8
T₂	284	310	8.4
T₃	244	262	6.9
T₄	197	186	5.9
T₅	151	131	15.3

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参考文献(12)

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