The flow fields are different for the three phasemotion patterns and there are two types of leading-edge vortex motion at an earlier stage of upstroke or downstroke.
三种相位下的涡流场形态各有不同，上挥（下拍）初期前缘涡的运动主要存在两种形态。
2
Phase 4: Set the Measurement Model in motion.
阶段4：设置行动度量模型。
3
In the case of plane motion, the phase plane method can be used to analyse the motion qualitatively.