It is found that: the center of the cyclone separation is a forced upward rotation vortex; the external is a quasi-free downward rotation vortex.
研究发现：旋风分离器的中心为向上旋转的强制涡，外部为向下旋转的准自由涡。
2
The rotation speed falls below the forced commutation frequency.
旋转速度低于强制换向频率。
3
The component of rotation along the velocity vector is used with the rotary balance test data and other components of the rotation vector are used with the forced oscillation test data.