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Considering the influence of the tower shadow effect of wind turbines, and aiming at the problem that the elevation angle of wind turbines makes the aerodynamic characteristics of wind turbines more complicated, the flow field of horizontal axis wind turbines with different elevation angles was numerically simulated in this paper, and the pressure distribution of wind turbine blade cross section, vorticity and the change law of the tower cylinder surface pressure with phase angle were analyzed, so as to explore the influence of the elevation angle of wind turbines on the output power of wind turbines. The results show that increasing the rotor elevation angle can reduce the blade surface pressure, decrease the pressure difference at the tip part, and reduce the high vorticity area on the blade surface. Adding elevation angle to the wind turbine reduces the influence of the blade on the tower barrel, and the high vorticity area on the tower barrel surface gradually decreases with the increase of the wind turbine elevation angle, thus reducing the pressure fluctuation on the tower barrel surface. When the blade passes through the tower, the tower shadow effect has a great influence on the wind turbine, and the output power of the wind turbine decreases. When the blade is upright, the wind turbine output power reaches its maximum. After the elevation angle is added to the wind turbine, both the output power of the wind turbine and the elevation angle of the wind turbine wheel increase first and then decrease. The output power of wind turbine increases when the elevation angle of wind turbine is 3°, and the fluctuation decreases when the elevation angle is 6 °. The relevant conclusions can provide data support for the operation of wind turbine.
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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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