湍流边界层脉动压力波数-频率谱模型对比研究

A Comparative Study of Models for the Wavenumber-Frequency Spectrum of TBL Fluctuation Pressure

湍流边界层噪声是舰船主要水动力噪声之一。湍流边界层噪声预报须选用适当的脉动压力波数—频率谱模型。引入6种常用的脉动压力波数-频率谱模型,在波数域和频域内进行对比;运用这些模型对槽道流边界层脉动压力自功率谱进行预报,并引入试验结果进行对比,为工程应用中选择适当的脉动压力波数—频率谱模型提供依据:Corcos模型物理意义明确,但预报精度稍差;Chase模型表达式复杂,经验性更强,物理意义不明晰,预报精度较高。

The Turbulent Boundary Layers（TBL） noise is one of the major components of hydrodynamic noise.For prediction of the TBL noise,however it requires a suitable model of the wavenumber-frequency spectrum of TBL fluctuation pressure,so choosing a most appropriate model becomes substantially important.Six kinds of wavenumber-frequency spectrum models were introduced and compared in frequency domain and wavenumber domain in this study.The auto-spectrum of TBL pressure of a channel was calculated with the six models as mentioned above,and also compared with the experimental results.Some of available results are presented for practical use.The study shows that the Corcos model has definite physical significance but less accuracy,other than Chase model,which is empirical and has much more complicated expression,but usually leads to more accurate results with the experimental＇s.