结果表明，自振荡不稳定性既可以在浓缩过程中出现，也可以在稀释过程中出现；
The result shows that the self-oscillating instability may occur both in the course of concentration and in the course of dilution.
这时可能产生的问题包括：振荡、负读数以及通常不稳定读数。
Some of the problems that may result include oscillations, negative readings and generally unstable readings.
采用离散旋涡法对振荡叶栅传播失速不稳定流场进行了数值模拟。
The unsteady flow in an oscillating cascade with propagating stall was simulated numerically with discrete vortex method.
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