A、当Q1＝Qmin，旋转脱离并扩大，出口压力p2减小，<p’ when q1="Qmin," the rotation disengages and expands,exit pressure p2 decreases,> B、倒流Q1<0:下游管道 p2，reverse flow downstream pipe p "decreases,> C、正流Q1>0:下游管道 p’增大，> p2，Positive flow Q1>0: downstream pipe p "increases, > p2
D、Q1减小，<0，q1 goes down, is less than>