孔穴流激噪声的计算与验证研究

流激噪声的预报问题是流体动力声学领域的重点和难点.在气动声学领域,人们对此问题进行了很多探索,而在水声学领域,该问题尚缺乏深入的研究,文章的目的在于初步建立适用于水中流激噪声预报的数值方法.通过大涡模拟(LES)方法和FW-H声学类比方法,计算了两类孔穴的流激噪声问题.分析了声压谱级,壁面压力功率谱、涡量分布等,并利用试验结果对数值预报进行了验证.研究表明,计算结果量级可靠,符合声学一般规律.

Validation and calculation of flow-induced noise of cavity

The prediction of flow-induced noise is an important and complex issue in fluid-dynamic acoustics field.In hydroacoustics,it is short of an intensive investigation for the problem.So a numerical scheme for the prediction of flow-induced noise in water is expected to be established in the paper.The calculations of flow-induced noise of two cavities are accomplished by solving FW-H equation with large eddy simulation(LES).And the SPL spectrum,power spectrum of wall pressure and vorticity distribution are analyzed.The numerical predictions are compared with measured data.It shows that the computed results which accord with common rules in acoustic are acceptable.