INVESTIGATION ON INFLUENCE OF WIND FIELD CHARACTERISTICS OF DOWNBURST FLOW AND WIND TURBINE BLADE DEFORMATION UNDER DIFFERENT JET INCLINATION ANGLES

Wang Yan; An Long; Li Haolin; Wang Bo; Li Ye

doi:10.19912/j.0254-0096.tynxb.2024-1275

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (11) : 692-703. DOI: 10.19912/j.0254-0096.tynxb.2024-1275

INVESTIGATION ON INFLUENCE OF WIND FIELD CHARACTERISTICS OF DOWNBURST FLOW AND WIND TURBINE BLADE DEFORMATION UNDER DIFFERENT JET INCLINATION ANGLES

Wang Yan^1,2, An Long^1,2, Li Haolin³, Wang Bo¹, Li Ye¹

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Abstract

In order to reveal the wind field characteristics of downburst flow at different jet inclination angles and their effects on wind turbine blade deformation, this study simulated the wind field characteristics of atmospheric boundary layer at five jet inclination angles of 0°, 5°, 10°, 15° and 20° based on computational fluid dynamics method, analyzed the horizontal and vertical wind velocity profiles of downburst flow at different jet inclination angles. Meanwhile, the influence of wind field with different jet inclination angles on blade surface pressure distribution and structural deformation is explored. The results show that with the increase of jet inclination, the maximum horizontal wind speed on the side where the downburst occurs increases, and the rate of vertical velocity decreasing slows down. The change of inclination angle has anegligible effect on the pressure in the area where the downburst occurs. For the influence of turbulence intensity distribution, the turbulence intensity at the back of the jet region increases with the increase of jet inclination, while the turbulence intensity at the front side decreases. When the wind turbine is located in the downburst flow field with different jet inclination angles, the distribution of blade surface pressure is inhomogeneous, and the blade tip bears more wind pressure than other positions. With the increase of jet inclination angle, the blade surface pressure increases, the pressure of the near-ground two blades increases substantially, reaching the maximum value of about 50 Pa when the inclination is 20°. The pressure of the father-from-ground blade surface increases slowly. The structural deformation at blade tip and the equivalent stress in the middle of blade increase with the increase of the inclination angle. This study provides some theoretical support for the safe operation of wind turbines in extreme weather, also offers assistance for wind turbine anti-wind design.

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jet tilt / downburst / wind turbines / wind turbine blades / wind field characteristics / structural deformation

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Wang Yan, An Long, Li Haolin, Wang Bo, Li Ye. INVESTIGATION ON INFLUENCE OF WIND FIELD CHARACTERISTICS OF DOWNBURST FLOW AND WIND TURBINE BLADE DEFORMATION UNDER DIFFERENT JET INCLINATION ANGLES[J]. Acta Energiae Solaris Sinica. 2025, 46(11): 692-703 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1275

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