Before cavitation occurs, the underwater vehicle’ noise is mainly composed of structural noise, mechanical noise, instrument noise, etc. The noise mainly radiate in multipole form. And the line and non-line spectrums coexist in the noise spectrum. Besides, it changes with the flow velocity and the environmental pressure. Once the cavitation occurs, there are obvious differences in the noise spectrum. In order to study the noise characteristics of underwater high-speed vehicle, a numerical model of LES/FW-H coupling is established based on VOF multiphase flow and Schnerr and Sauer cavitation model. Then, the numerical simulation and water tunnel experiments are carried out to obtain the noise characteristics of the vehicle on different working conditions. The source of the noise is analyzed. The influence of velocity, pressure and cavitation on the noise and the directivity of the noise are revealed. The results of this paper can provide some reference for the study of the noise characteristics of underwater high-speed vehicle. It is helpful to better grasp the related technology of underwater high-speed vehicle and provide some support for reducing the noise of the high-speed vehicle or its detection.

中文翻译：

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基于LES / FW-H耦合模型的水下高速车辆流噪声特性分析

在发生气蚀之前，水下航行器的噪声主要由结构噪声，机械噪声，仪器噪声等组成。噪声主要以多极形式辐射。并且线谱和非线性谱共存于噪声谱中。此外，它还随流速和环境压力而变化。一旦发生气穴现象，噪声频谱就会明显不同。为了研究水下高速航行器的噪声特性，建立了基于VOF多相流以及Schnerr和Sauer气蚀模型的LES / FW-H耦合数值模型。然后，通过数值模拟和水隧道实验，获得了车辆在不同工况下的噪声特性。分析了噪声源。速度的影响 揭示了噪声上的压力和气穴现象以及噪声的方向性。研究结果可为水下高速车辆的噪声特性研究提供参考。有助于更好地掌握水下高速车辆的相关技术，为降低高速车辆的噪声或检测噪声提供一些支持。