稀薄氩电弧射流 plume 中磁化模型周围的激光汤姆逊散射测量
Laser Thomson Scattering Measurements around Magnetized Model in Rarefied Argon Arcjet Plume
AI总结：
本研究通过激光汤姆逊散射测量稀薄氩电弧射流中磁化模型周围的电子温度和密度，发现磁场对电子密度影响小，但电子温度增幅低于CFD预测，揭示绝缘边界位置远离模型。
摘要：
为阐明稀薄流中磁流体动力学（MHD）气动制动中霍尔效应的作用，我们利用激光汤姆逊散射方法，在稀薄氩电弧风洞中测量了磁化模型前方的电子温度和密度的径向分布。我们还开发了一种水冷磁化模型，以防止测量过程中的热退磁。测得的电子密度分布与计算流体动力学（CFD）预测结果非常一致。还发现，磁场对模型周围的电子密度分布影响很小。在没有磁场的情况下，测得的电子温度与CFD预测几乎一致。然而，由于施加磁场引起的实测电子温度增加比CFD预测低约1000 K。这一差异表明，等离子体中绝缘边界的位置远离模型。
英文摘要：
To elucidate the role of the Hall effect in magnetohydrodynamic (MHD) aerobraking in rarefied flows,we measured the radial distributions of electron temperature and density in front of a magnetized model in a rarefied argon arcjet wind tunnel using the laser Thomson scattering method. We also developed a water-cooled magnetized model to prevent thermal demagnetization during the measurement. The measured electron density distributions were in excellent agreement with computational fluid dynamics (CFD) predictions. It was also found that the magnetic field had little effect on the electron density distribution around the model. In the case without the magnetic field, the measured electron temperature almost agreed with the CFD prediction. However, the measured electron temperature increase caused by applying the magnetic field was about 1,000 K less than that of the CFD prediction. This discrepancy indicates that the location of an insulating boundary in the plasma is far from the model.
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