The near plume of an SPT100-like Hall thruster is simulated with a hybrid particle-in-cell/fluid code to assess the three-dimensional effects of the neutralizer for two different asymmetric positions. The electron fluid model accounts for the effects of both magnetization and collisions, and closes the momentum equation with a simple polytropic closure for the electron temperature. The observed asymmetries are small in the majority of the plasma plume properties and in the achieved magnetic thrust and torque, which also show consistent trends with the available experimental characterizations. The only exception is represented by the 3D electric and electron current densities, which show persistent asymmetries that tend to diminish as the neutralizer is placed both farther downstream and radially outward, outside of the magnetic separatrix. These findings permit to justify the use of axisymmetric codes for Hall-effect thruster performance estimation. The results on the neutralizer asymmetry effects are found robust to different polytropic coefficients (i.e. electron temperature gradients). Finally, the comparison of the adopted polytropic closure model against an advanced one including the energy balance equation shows relevant differences in the electron temperature but still a good agreement in the electron current density map.

类似 SPT100 的霍尔推进器的近羽流使用混合粒子细胞/流体代码进行模拟，以评估中和器在两个不同不对称位置的三维效果。电子流体模型考虑了磁化和碰撞的影响，并用电子温度的简单多方闭合来闭合动量方程。在大多数等离子体羽流特性和实现的磁推力和扭矩中，观察到的不对称性很小，这也显示出与可用实验特征一致的趋势。唯一的例外是 3D 电流密度和电子电流密度，它显示出持续的不对称性，随着中和器放置在磁分离面之外更远的下游和径向向外，这种不对称性往往会减弱。这些发现证明了使用轴对称代码进行霍尔效应推进器性能评估的合理性。发现中和器不对称效应的结果对不同的多变系数（即电子温度梯度）具有鲁棒性。最后，所采用的多方闭合模型与包括能量平衡方程在内的先进模型的比较显示了电子温度的相关差异，但在电子电流密度图中仍然具有良好的一致性。