Alford力中效率系数的一种计算方法

Calculation of efficiency factor in Alford′s force

研究了叶轮偏心引起的气流激振的机理和Alford力的计算方法 ,利用B .Lakshminarayana公式推导了一个包括叶栅参数和流动参数的效率系数ε的新计算公式 ,解决了Alford公式中需人为选取效率系数的困难 。

The mechanism of gas exciting for wheel eccentricity and calculation of Alford′s force were studied. The physical meaning and range of numerical value about efficiency factor were discussed. A new formulation was derived considering the parameter of blade and flowing. It got rid of the difficulty in selecting efficiency factor in Alford′s formulation and laid a theoretical foundation for increasing the stability of turbine rotor.