发动机水下排气噪声预报研究(英文)

Study of the Prediction of the Engine’s Underwater Exhaust Noise

由于涉及到两相流,所以发动机水下排气噪声的产生机理和辐射特性非常复杂。文章基于Mixture多相流模型、RNGκ-ε湍流模型和Ffowcs Williams-Hawking声学模型对发动机水下排气噪声进行了数值预报研究,并试验测量了相应工况下发动机水下排气噪声,对数值研究的结果进行了验证。结果表明,文中所提出的发动机水下排气噪声数值预报方法在工程上是可行的。

The generation mechanism and radiation characteristics of the engine＇s underwater exhaust noise are complicated due to gas water two phase flow. In this paper, the engine＇s underwater exhaust noise is predicted numerically based on the Mixture muhiphase flow model,the RNG k-ε turbulence model and the Ffowcs Williams-Hawkings acoustic model. Meanwhile, the engine＇s underwater exhaust noise is measured based on the designed test rig. Comparison between the predicted underwater exhaust noise and the measured one shows that the proposed numerical method for the prediction of the engine＇ s underwater exhaust noise is feasible in engineering.