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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Conditions and a physical mechanism for plasma mitigation of shock wave in a supersonic flow
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Conditions and a physical mechanism for plasma mitigation of shock wave in a supersonic flow

机译：超音速流中冲击波等离子体缓和的条件和物理机理

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摘要

Wind tunnel experiments show that plasma generated by on-board discharges can significantly weaken the shock wave generated in front of a 30degrees half-angle truncated-cone model placed in a Mach 2.5 flow. Experimental results indicate that. in order to give rise significant effect on shock waves. plasma has to be generated in the region upstream of the baseline shock front and has to have a symmetrical spatial distribution with respect to the axis of the model. Experimental results also exclude the thermal effect as a possible cause of the observed shock wave mitigation. A physical mechanism of the observed nonthermal plasma effect on shock waves is presented. Analysis shows that a symmetrically distributed plasma spike in front of the shock can effectively deflect the incoming flow symmetrically. The required electron density of the plasma spike is estimated.
机译：风洞实验表明，机载放电产生的等离子体可以显着减弱在放置于Mach 2.5流中的30度半角截锥模型前面产生的冲击波。实验结果表明。为了对冲击波产生重大影响。等离子体必须在基线激波前沿的上游区域中产生，并且必须相对于模型的轴具有对称的空间分布。实验结果还排除了热效应，这可能是观察到的冲击波缓解的可能原因。提出了观察到的非热等离子体对冲击波影响的物理机制。分析表明，在冲击前对称分布的等离子体尖峰可以有效地使进入的流体对称地偏转。估计所需的等离子体尖峰电子密度。

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