Characteristics of a Supersonic Plasma Flow in a Magnetic Nozzle
Characteristics of a Supersonic Plasma Flow in a Magnetic Nozzle
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DOI：
10.1585/jspf.78.1352
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发表时间：
2002-12
期刊：
影响因子：
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通讯作者：
M. Inutake;A. Ando;K. Hattori;H. Tobari;T. Yagai
中科院分区：
文献类型：
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作者：
M. Inutake;A. Ando;K. Hattori;H. Tobari;T. Yagai
通过在各种外部磁场配置中使用磁等离子体动力电弧喷射（MPDA），准稳定（1 ms）产生高密度和高速流动的氦等离子体。在均匀磁场配置中，等离子体流的离子声学马赫数Mi被限制为接近一致。另一方面，在发散磁性喷嘴配置中，马赫数增加到几乎3。马赫数与磁场梯度成比例增加。 Mi 的空间变化可以通过可压缩流的等熵模型很好地预测。由于表面复合中性气体的有限泵浦能力引起的电荷交换碰撞过程，马赫数在下游区域降低。
A high-density and high-speed flowing helium-plasma is produced quasi-steadily (1 ms) by use of a magneto-plasma-dynamic arcjet (MPDA) in various external magnetic field configurations. In a uniform magnetic field configuration, an ion acoustic Mach number Mi of the plasma flow is limited to be nearly unity. In a divergent magnetic nozzle configuration, on the other hand, the Mach number increases up to almost 3. The Mach number increases in proportion to the gradient of the magnetic field. Spatial variations of Mi are well predicted by an isentropic model of compressible flow. The Mach number decreases in the downstream region due to charge-exchange collisional processes that are caused by a limited pumping capability of surface-recombined neutral gases.