This is caused principally by the vortexcore of whirling water in the draft tube.
这种振动主要是由尾水管中的旋涡带所致。
2
The tangential velocity distribution measured in this study is similar to a vortexcore existing along the jet axis.
旋转射流的切向速度分布相当于射流中存在一个旋转的涡核。
3
The result showed that the stream function of vortex tube was expressed as the superposition of the stream functions of vortex filament within the vortexcore.