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In order to investigate the effect of fillets at the leading and trailing edges of flow holes on the noise characteristics of submerged body, a submerged body with a single flow hole was taken as the research object. Based on the large eddy simulation turbulence model and FW-H (Ffowcs Williams-Hawkings) acoustic model, numerical simulations were carried out using STAR CCM+ software. After verifying that the simulation accuracy meets the requirements, the influence of different fillet positions and radii of the orifice on flow noise was then deeply explored at a flow rate of 10 m/s. The results show that the treatment of fillets at the leading and trailing edges of the flow hole can reduce the flow noise of the flow hole, especially the second-order line-spectrum noise. Regarding fillet position, the noise reduction amplitude by the fillets at the trailing edges is greater than that at the leading edge, and the noise reduction amplitude at the outer rounded corners is greater than that at the inner edge. In the studied operating conditions, when the outer edges of the leading and trailing edges of the orifice are simultaneously rounded with a radius of 10 mm, the minimum second-order line-spectrum noise is 94.03 dB, which is 9.48 dB lower than that in the reference operating condition, and the corresponding frequency is reduced by 4.72 Hz. The far-field radiation noise of the orifice is mainly affected by the pressure pulsation on the back wall and bottom of the orifice, and the influence of the orifice shear layer oscillation is relatively small. The research conclusions provide guidance for the optimization of submerged body flow hole structure and the low-noise design.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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