It usually appears at the RF, bladepassage frequency and commutator brush frequency, and their higher harmonics.
它通常出现在射频，叶片通过频率和整流子刷频率，其高次谐波。
2
Relative eddy is a special relative flow within centrifugal bladepassage, which is of prime importance in flow study of pumps.
轴向旋涡流动是离心叶轮叶片之间一种特殊的相对流动，其流动规律是离心叶轮正反问题研究的重要基础。
3
Some of new distributing features of the turbulent flow in the bladepassage were found out, and a progress of the vibrating analysis methodology of the blades was achieved.