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Hybrid PIC-MCC computational modeling of Hall thrusters.

机译：霍尔推力器的混合PIC-MCC计算模型。

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This dissertation describes the development of a 2-D axisymmetric hybrid Particle-In-Cell Monte Carlo Collision (PIC-MCC) Hall thruster code and an investigation into the effects of the numerical parameters and physical models for this code. From the outset, it is clear that some of the necessary model boundary conditions have significant effects on both the spatial and temporal dynamics of the simulation. Therefore, judicious modeling choices must be taken to minimize interference in critical thruster physical processes.; A study of the electron mobility term assesses the performance of various existing computational models of electron mobility. In the process, it is demonstrated that nearly identical thrust performance can be achieved by simulations with different plasma characteristics. As a result, robust validation against more than integrated performance data is necessary to truly validate simulation results. In this regard, none of the computational mobility models shows great success in capturing the details of the mean centerline potential profile.; A semi-empirical electron mobility is developed which results in the successful validation of this code using data measured for the UM/AFRL P5 Hall thruster. The semi-empirical electron mobility is then used as a reference configuration against which to refine the computational models for electron mobility. An analysis of a dataset of UM/AFRL P5 internal plasma properties uncovered evidence of a strong magnetic self-field during thruster operation. (The existence of a magnetic self-field in this thruster has been identified only once before.) This self-field provides physically motivated corrections which drive the output, of the computational model for electron mobility towards the reference configuration.; The original goal of this work was to better understand and extend the physical principles contained in existing computational simulation of Hall thrusters. In the process of validating the existing code with a mobility profile derived from experimental sources, it is discovered that electrostatic codes (such as this one) can produce results in good agreement with experimental data if tuned correctly with some knowledge of experimental conditions; however, fully self-consistent computational modeling of these thrusters will require an electromagnetic solver to properly resolve the correct magnetic configuration during thruster operation.
机译：本文描述了二维轴对称混合粒子内蒙特卡罗碰撞（PIC-MCC）霍尔推力器代码的发展，并研究了该代码的数值参数和物理模型的影响。从一开始，很明显，某些必要的模型边界条件对模拟的时空动力学都有重大影响。因此，必须采取明智的建模选择，以最大程度地减少对关键推进器物理过程的干扰。对电子迁移率项的研究评估了各种现有的电子迁移率计算模型的性能。在此过程中，证明了通过具有不同等离子体特性的仿真可以实现几乎相同的推力性能。因此，必须要针对多个集成性能数据进行可靠的验证，才能真正验证仿真结果。在这方面，没有一个计算移动性模型在捕获平均中心线势剖面的细节方面显示出巨大的成功。开发了半经验电子迁移率，使用针对UM / AFRL P5霍尔推力器测量的数据成功验证了此代码。然后将半经验电子迁移率用作参考配置，以针对该参考配置完善电子迁移率的计算模型。 UM / AFRL P5内部等离子体特性数据集的分析未发现推进器运行期间强磁场自磁场的证据。 （该推力器中仅存在过一次磁场自磁场。）该自磁场提供了物理上的校正作用，该校正作用将电子迁移率计算模型的输出推向参考构型。这项工作的最初目标是更好地理解和扩展现有霍尔推力器计算仿真中包含的物理原理。在使用源自实验来源的迁移谱验证现有代码的过程中，发现如果对静电代码（如该代码）进行了适当的实验条件知识调整，其产生的结果与实验数据可以很好地吻合；但是，这些推进器的完全自洽的计算模型将需要电磁求解器来在推进器运行期间正确解析正确的磁性配置。

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