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首页> 外文会议>AIAA/SAE/ASEE joint propulsion conference;AIAA propulsion and energy forum >Application of a first-principles anomalous transport model for electrons to multiple Hall thrusters and operating conditions
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Application of a first-principles anomalous transport model for electrons to multiple Hall thrusters and operating conditions

机译：电子的第一性原理异常传输模型在多个霍尔推力器和工作条件下的应用

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We have developed a physics-based model based on a pseudo-particle description of the electron cyclotron drift instability. A key improvement of the model with respect to previous work is that linear theory is not applied in the event of wave saturation and deviations of electrons or ions from a Maxwellian distribution function. In the acceleration region, the anomalous collision frequency is computed as the minimum value necessary to prevent the electron drift velocity from exceeding the thermal velocity. A functional based on the electron equilibration time is defined to control the transition from high to low resistivity regions. The model was previously applied to a single Hall thruster at its nominal operating condition, showing promising results that captured accurately the location of the thruster's acceleration region. In this paper, we extend the use of this first-principles models to two additional thrusters, also considering multiple operating conditions for each of them. Numerical results are compared to experimental measurements obtained with non-invasive laser induced fluorescence. In general, the agreement between experiments and simulations is good. The model is able to predict the location of the acceleration region for all cases. We observe however that fine details, such as changes in the plasma potential gradient within the acceleration regions, are not captured. The model is also insensitive to changes in the magnetic field strength while experiments show that small shifts in location (of less than 5% of the acceleration channel length) occur. We plan to address the weaknesses of our method with the help of physical insight gained from kinetic simulations of the acceleration region.
机译：我们已经基于对电子回旋加速器漂移不稳定性的伪粒子描述，开发了基于物理学的模型。与先前的工作相比，该模型的关键改进在于，在波饱和以及电子或离子偏离麦克斯韦分布函数的情况下，不应用线性理论。在加速区域中，异常碰撞频率被计算为防止电子漂移速度超过热速度所需的最小值。定义了基于电子平衡时间的功能，以控制从高电阻率区域到低电阻率区域的过渡。该模型先前已在其标称工作条件下应用于单个Hall推进器，显示出可观的结果，可以准确地捕获推进器加速区域的位置。在本文中，我们将此第一性原理模型的使用扩展到两个附加推进器，同时还考虑了每个推进器的多种运行条件。将数值结果与使用非侵入性激光诱导的荧光获得的实验测量结果进行比较。通常，实验和模拟之间的一致性很好。该模型能够预测所有情况下加速区域的位置。但是，我们观察到没有捕获到精细的细节，例如加速区域内的等离子体电势梯度的变化。该模型还对磁场强度的变化不敏感，而实验表明位置发生了很小的变化（不到加速通道长度的5％）。我们计划借助从加速区域的动力学模拟中获得的物理洞察力来解决我们方法的弱点。

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