霍尔推力器寿命实验和计算分析

Experiment and calculation analysis of Hall thruster lifetime

为了准确高效地预估霍尔推力器寿命,利用在真空舱内工作较短时间后的霍尔推力器结合三坐标测量仪测量其放电室陶瓷绝缘内外壁面轮廓的直径沿周向的变化情况,以此作为输入参数结合概率密度公式获得了高效率的半经验公式法模型和计算结果。采用文献算例对模型和计算代码进行了验证,表明改进后的模型和算法能够在霍尔推力器短时间运行的测量结果基础上较为准确地预测长时间工作后放电室壁面轮廓形状,进而得到推力器的使用寿命。在此基础上,针对影响HET-40推力器寿命的主要因素进行了考察,获得了相关的影响规律。结果表明,其他条件不变的情况下,霍尔推力器的寿命与输入功率乘积近似常数,对于本研究对象,该常数大约为3.6×106 W·h。

In order to accurately and efficiently predict the lifetime of Hall thruster,the short-duration experiment was carried out in the vacuum tank in combination with three-coordinate measuring instrument.The discharge chamber wall profile parameters were obtained after Hall thruster working for some time.The impr oved semi-empirical model was developed based on the probability density function and the short-duration experimental results.The reliability was examined by using the experimental conditions and results of the available literature and showed the improved model and algorithm can efficiently predict the real lifetime of Hall thruster.The effects of the main factors on the lifetime were investigated.The results showed the lifetime times the power is about a constant and it is about 3.6×106W·h for HET-40 here.