单空泡演化及辐射噪声

利用边界元方法模拟了空气－蒸汽泡在不同壁面附近的演化情况，利用数值结果得到了空泡演化过程中体积的变化规律．与声学普遍方程Ｌｉｇｈｔｈｉｌ方程式在特殊情况下的解相结合得到空泡演化过程的辐射噪声．考察了不同壁面、空泡离壁面的距离和空泡的气体含量对空泡演化及辐射噪声的影响，该方法将边界元方法得到的空泡演化情况与声学方程在特殊情况下的解结合起来，放弃理论分析上不合理的球形假设，并考虑了边界的影响，这样更符合实际的空化现象，得到了与实验相一致的结论．

Growth and Collapse of Single Bubble and Its Noise

The paper uses BEM to model the evolution of the gas vapor bubble near different boundaries and gets the volume variational law by using the numerical results to calculate the noise during the bubble evolution. The effects of the different boundary, the distance between bubble and the boundary and the gas in bubble to the bubble evolution and its noise are investigated. The method combines BEM with the Lighthill equation to get the bubble noise. It gives up the unreasonable spherical hypothesis which is out of accord with the reality. The results is consistent with the experiments.