Based on the observation and analysis of flow visualization the mechanis of the vortex street has been recognized to be a flow instability probler.
本文根据水洞观察的结果，分析了圆柱体尾流中，卡门涡街形成的原因是由于流动的不稳定性所产生。
The result shows that the boundary layer radial vortex becomes an important factor for causing compressor flow instability.
结果表明，附面层径向涡是该压气机转子流动失稳的一个很重要的原因。
The forming and maintaining of K-H instability was an important reason of causing vortex on the shear line maintain, strengthen, and causing rainstorm.
不稳定的形成和维持，是导致中尺度切变线上小尺度涡旋维持、加强，并产生强风暴雨的重要原因。
Besides, a notable vortex rope and a reverse flow structure exist in the draft tube in smaller wicket gate openings, which can easily lead to the instability in operation of the pump-turbine.
此外，发现开度较小时尾水管内存在明显的涡带和回流涡结构，容易导致机组运行的不稳定；
Before the vortex breakdown, the aeroelastic instability presents itself as just a simple flutter.
涡破裂前，气动弹性失稳表现为单纯的颤振问题。
Before the vortex breakdown, the aeroelastic instability presents itself as just a simple flutter.
涡破裂前，气动弹性失稳表现为单纯的颤振问题。
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