流动诱导空腔振荡频率方程的改进

Development of the Frequency Equation Used for Prediction of Fluid Induced Pressure Oscillation in Cavities

研究了流动诱导空腔振荡的机理 ,并做了相应的实验。基于流动诱导空腔振荡的机理和小尺寸空腔 (长深比L / D =4 ,2 )的实验 ,对预测流动诱导空腔自由剪切层自激振荡模态的频率方程和声学模态的频率方程作了合理改进 ,实验结果表明 ,这一改进提高了流动诱导空腔剪切层自激振荡模态和声学模态的预测精度 ,并能用于工程计算。

The mechanism of the fluid induced pressure oscillation in cavities is investigated in this paper and some of its experiments are conducted. Based on the mechanism and the experiments on small scale cavities (the ratio of length and depth is 4 or 2), the equation for prediction of pressure oscillation frequency, the self-sustaining oscillation frequency due to the free shear layer and acoustic mode frequency is established. The experimental result shows that the accuracy of the prediction on the pressure oscillation mode frequency is improved and they can be used for engineering practice.