The tangential velocity distribution measured in this study is similar to a vortex core 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。
2
Vortex also called left turn, is the axis of rotation happened a self-excited vibration, it is neither has the free vibration characteristics, also do not belong to the type of forced vibration.