近水面潜航体的长径比对海表尾迹的时频域影响OA北大核心CSTPCD

To investigate the effect of submarine aspect ratios on sea-surface wake characteristics,the real size hull models with different aspect ratios were constructed,the computational fluid dynamics(CFD)methods were used to simulate its wave-making wake at a uniform speed in two layers of fluids,and the two-dimensional fast Fourier transform(2D-FFT)was used in the time domain to obtain the power spectral density(PSD)distribution of the wake signal.Research results show that the stratification effect is less affected when one sails near the surface,and the resulting wake spectral density value accounts for about 1%of the sea surface wake system,and whether the bow and stern transverse waves occur favorable interference or not has a greater impact on free-surface wake characteristics of both spatial domain and frequency domain than the difference in the displacement of the hull.When favorable interference occurs at both the bow and stern transverse waves,the hull with smaller aspect ratio has a relatively smaller proportion of high-frequency wave components in the sea surface wake,which provides a better wake stealth performance with a larger displacement.