本文采用与时间有关的线性微扰理论，分别讨论了旋转气流、纵向气流的作用，以及它们共同的作用下电弧螺旋不稳定性的特征。
The linear time perturbation theory is used in this paper, the effects of rotary flow, axial flow and both of them to the arc stability are discussed respectively.
这个斜面锐角使进气口的气流纵向流变。
The ramp sits at an acute Angle to deflect the intake airstream from the longitudinal direction.
这个斜面锐角使进气口的气流纵向流变。
The ramp sits at an acute Angle to deflect the intake air stream from the longitudinal direction.
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