Abstract
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.
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