STUDY ON SURFACE WIND PRESSURE CHARACTERISTICS OF WIND TURBINE AT SHUTDOWN CONDITION UNDER DOWNBURST

Wang Hui; Li Jiangjiang; Wu Xuejian

doi:10.19912/j.0254-0096.tynxb.2023-2079

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (4) : 454-462. DOI: 10.19912/j.0254-0096.tynxb.2023-2079

STUDY ON SURFACE WIND PRESSURE CHARACTERISTICS OF WIND TURBINE AT SHUTDOWN CONDITION UNDER DOWNBURST

Wang Hui, Li Jiangjiang, Wu Xuejian

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Abstract

The Reynolds time-averaged method is used to study the characteristics of static and moving downburst wind field, and the influence of jet center movement speed V_t on the structure of downburst wind field is analyzed. Taking NREL 5 MW wind turbine as research object, the characteristics of flow field and surface wind pressure around wind turbine in downburst field are studied and revealed. The results show that the increase of the movement speed V_t causes wind speed around wind turbine to decrease and the extreme value to increase, and the vortex rotation direction changes from around X axis to conical oblique downward. The wind pressure on pressure surface and suction surface of the tower along circumference varies as the shape of "mountain" and "inverted U" respectively. The wind pressure on suction surface of the blades varies along chord length as the shape of "oblique inverted U", while the wind pressure on suction surface of the blades is basically same. The increase of the actual distance l leads to a slight increase in the extreme value of the wind pressure on pressure surface of wind turbine, and the two sides and suction surface change from positive pressure to negative pressure, and then which all turn to a uniform positive pressure with wind coefficient of 0.16. The increase of the movement speed V_t will compress the influence area of the front edge of the storm, resulting in a significant difference in the mean wind coefficient with similar actual distance l and different movement speed V_t.

Key words

downburst wind / moving downburst / wind turbine / SST k-ω model / radial distance / surface wind pressure

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Wang Hui, Li Jiangjiang, Wu Xuejian. STUDY ON SURFACE WIND PRESSURE CHARACTERISTICS OF WIND TURBINE AT SHUTDOWN CONDITION UNDER DOWNBURST[J]. Acta Energiae Solaris Sinica. 2025, 46(4): 454-462 https://doi.org/10.19912/j.0254-0096.tynxb.2023-2079

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