水下系留平台的海流发电叶片翼型流噪声特性研究

In order to investigate the serious acoustic noise of marine current turbines of underwater mooring platform, FW-H equation is adopted to study the noise characteristics of the hydrofoils of the turbine prototype based on the transient results of large eddy simulation. The results show that the numerical method and the experimental tests have consistent noise spectrum, which indicates the applicability of the numerical method in this paper. The near-field noise radiation characteristics of the three airfoils are quite different. The far-field noise radiation characteristics are typical of dipole sound fields. With the increase of flow velocity, the radiation direction of near-field noise gradually moves from the trailing edge of airfoil to the front edge, and the sound pressure levels of both near-field noise and far-field noise increase gradually. The spectra of sound pressure level in octave band show that the noise energy is concentrated in the low frequency band and increases with the increase of flow velocity. With the increase of angle of attack, the sound pressure level of hydrofoil noise increases gradually, and the radiated noise in near and far fields becomes more and more serious, which is closely related to the change of pressure in flow field.