Influence of hole neck deviation angle on noise of submerged body's flow holes
In order to explore the noise characteristics of submerged flow holes,a submerged body with flow holes was taken as the research object.Based on the large eddy simulation turbulence model and FW-H acoustic model,numerical simulations were carried out using STAR-CCM+software.Af-ter verifying that the simulation accuracy meets the requirements,the influence of flow hole neck de-viation angle on flow noise was deeply explored.The results show that in the low frequency range(0～150 Hz),the smaller the angle of the hole neck deviation,the lower the sound pressure level of the far-field radiation flow noise,compared to the 90°deviation angle,the first sound pressure level at the monitoring point decreases by 0.13 dB at the 15°deviation angle,and the second sound pressure level decreases by 21.24 dB;that in the medium to high frequency range(150～5 000 Hz),the radiation noise of the water flow hole is minimized when the hole neck deviation angle is 45°;and that the smal-ler the deviation angle of the hole neck,the less boundary layer separation and self-sustaining oscilla-tion of shear layer at the opening,the reduced normal component of the separation vortex,and the smaller the fluid fluctuation downstream of the flowing hole.The conclusion is of significance for guiding the optimization of submerged body's flow hole structure and low noise design.
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