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首页> 外文期刊>Plasma Sources Science & Technology >Facility pressure effects on a Hall thruster with an external cathode: I. Numerical simulations
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Facility pressure effects on a Hall thruster with an external cathode: I. Numerical simulations

机译：具有外部阴极的大厅推进器的设施压力影响：I.数值模拟

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We employ the 2D (r–z) code Hall2De to conduct numerical simulations of the SPT-140, a Hall thruster that operates with an external hollow cathode. The simulations are informed by direct measurements of the plasma conditions in the acceleration channel that were obtained using the laser-induced fluorescence technique. We validate our simulation results with additional plasma measurements, wear test erosion rates, and performance data as a function of background pressure. The comparisons of the simulation results with thrust measurements provide insight into the longstanding question of how background pressure affects Hall thruster performance. We find that in thrusters with an external cathode changes in the thrust with varying backpressure can be partially explained by changes in the plasma density near the cathode. We argue that such changes in the density affect the voltage coupling and, eventually, the thrust. However, accounting for this mechanism alone in the simulations over-predicts the thrust measured during ground tests for backpressures less than 10 μTorr. Also, at these backpressures, the measurements showed a higher rate of change of the thrust compared to the simulations. We propose that one explanation for this discrepancy is that the acceleration region may be axially shifting downstream with decreasing backpressure. Though possible, we also recognize that such shifts are not observed in LIF measurements at the lowest pressures for which such diagnostics are possible. We discuss alternative explanations in Part II of this article.
机译：我们使用2D（r–z）代码Hall2De对SPT-140进行了数值模拟，SPT-140是一种使用外部空心阴极运行的霍尔推力器。通过直接测量加速通道中的等离子体条件（使用激光诱导荧光技术获得）来进行模拟。我们通过额外的等离子体测量、磨损试验侵蚀率和作为背景压力函数的性能数据来验证我们的模拟结果。通过将模拟结果与推力测量结果进行比较，可以深入了解背景压力如何影响霍尔推力器性能这一长期存在的问题。我们发现，在带有外部阴极的推进器中，随着背压的变化，推力的变化可以部分地用阴极附近等离子体密度的变化来解释。我们认为，密度的这种变化会影响电压耦合，并最终影响推力。然而，在模拟中仅考虑这一机制，就高估了在背压小于10μTorr的地面试验中测得的推力。此外，在这些背压下，测量结果显示，与模拟结果相比，推力的变化率更高。我们认为，对这种差异的一种解释是，随着背压的降低，加速区域可能会向下游轴向移动。虽然可能，但我们也认识到，在可能进行此类诊断的最低压力下，在LIF测量中未观察到此类位移。我们将在本文的第二部分讨论其他解释。

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