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Large Eddy Simulation (LES) method was employed to simulate the pressure fluctuations on the wall of NACA 0015 hydrofoil. The spatio-temporal correlation characteristics were studied using wavenumber-frequency spectrum (WFS), and six empirical models were used to predict the WFS on the hydrofoil. The results show that at zero angle of attack, as the position of sensors moves towards the trailing edge, the dimensionless convection velocity gradually approaches the theoretical predicted value of 0.7. At the same incoming velocity, the spectral level of the WFS at the ridge increases with the increase of the angle of attack. The predictions of the six empirical models show differences from the simulation results, with the Efimtsov model having the minimum values and the Ffowcs-Williams model having the maximum values. The simulation results fall between the predicted values of the Efimtsov model and those of the Corcos model.
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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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