在螺旋桨式风机的静压曲线中存在着不稳定区域或断点。
There is always an unstable region or break in the static pressure curve of a propeller fan.
得到如下一些重要结论：1。不稳定区域密度波振荡为有限的持续振荡。
The following conclusions are obtained: 1. the density wave in an unstable area develops a finite continuous oscillation.
结果表明，荷载偏心增大了支臂的动力不稳定区域，不利于支臂的动力稳定。
Based on the analyzing results, the eccentric loading increased the dynamic-instability district of the arm and would be adverse to its dynamic-stability.
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