剪切流场中叶片上颤振力的计算

压气机转子通过静子的尾流区时,往往偏离在理想的位势流下设计出的工况,例如叶片上的举力是不稳定的,从而引起气流总压的变化.本文应用旋涡理论导出了小剪切流场中叶片上不稳定举力的一般表达式,井根据文献4]中的思想,提出了一个简单的计算方法,以便较快速地计算这种变化,调整设计参数.本文的计算结果与文献9]中的实验结果作了比较,是令人满意的.

FLUCTUATING LIFT FORCE ON CASCADE MOVING THROUGH A SMALL SHEAR FLOW

The behaviour of rotor blades moving through the wake flow coming from stator departs from one which is designed by the potential flow theory, for example, the lift force on the blades is fluctuating. Hence the total pressure in flow is changeable. Based on the vortex theory, the present paper deduces an expression of the fluctuating lift force on cascade moving through a small shear flow, and presents a simple computational method by using the suggestion given in Ref.4]. Comparison with the experimental results of Ref.9] is satisfactory. Our method helps the rotor designer to adjust the design parameters selected.