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Inspired by the bionic principle of bird covert feathers on the upper wings, this paper designs four types of flexible sawteeth with different thicknesses, and the sawteeth are installed at different positions on the upper-surface of the NACA 0018 two-dimensional airfoil at an angle-of-attack of 15°, and the velocity profiles in the wake flow is measured by the hot-wire anemometer. The Reynolds number based on chord length of 300 mm is 5.1×105, and the mean velocity profiles and root-mean-square velocities show that the thinner flexible sawteeth can eliminate the leading-edge shear layer when installed near the leading-edge of the airfoil, and the power spectral density results show that the turbulent fluctuations are suppressed. On the contrary, the thicker flexible sawteeth are able to control the leading-edge flow separation when installed near the trailing-edge of the airfoil, and the high-speed fluid is induced to adhere to the upper-surface of the airfoil.
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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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