NUMERICAL INVESTIGATION ON FLOW FIELD AROUND BLADE OF WIND TURBINE UNDER YAW CONDITION BASED ON BLADE DEFORMATION

Niu Jiajia; Zhang Liru; Jiao Xuewen; Wang Jianwen

doi:10.19912/j.0254-0096.tynxb.2020-1123

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (3) : 301-305. DOI: 10.19912/j.0254-0096.tynxb.2020-1123

NUMERICAL INVESTIGATION ON FLOW FIELD AROUND BLADE OF WIND TURBINE UNDER YAW CONDITION BASED ON BLADE DEFORMATION

Niu Jiajia¹, Zhang Liru^1,2,3, Jiao Xuewen¹, Wang Jianwen^1,2,3

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Abstract

Flow field around the horizontal axis wind turbine blades was calculated numerically by two-way of fluid-solid coupling method based on the blade deformation under different working condition in order to study the influence of flow field around on the blades deformation which was resulted by the interaction between wind blade and flow field around in the yaw condition. And the influence the yaw condition on the deformation and surface stress of wind blade was also analyzed. Furthermore, the variation of flow field around the blade under yaw working condition was studied. The results indicated that non-uniform characteristic was displayed with different deformation and stress on the different blades and this non-uniform level was increased with the increasing of yaw angle. The maximum deformation of blade was increased when the wind speed was raised while tip speed ratio was declined. When the yaw angle became larger, both the area of maximum stress concentration at blade root and the stress at blade rear edge were decreased gradually. Meanwhile, the axial velocity was increasing from the blade root to the blade tip along with the blade spread. And this increasing degree of axial velocity at blade tip was more than that at blade root with yaw angle raise. But the increasing degree of the axial velocity was declined at blade tip in this working condition. And the vorticity of flow field was decreasing and the influence of the vorticity at blade tip was more than that of the vorticity in the center. The tendency that decreasing first and then increasing of the turbulent kinetic energy was displayed generally. Specifically, the minimum vorticity was found at the position 0.6R relative radius with the yaw angle changed from 5° to 25°. When the yaw angle was 30° the minimum vorticity was at 0.7R position.

Key words

wind turbines / yaw / deformation / fluid-solid / flow field around blade

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Niu Jiajia, Zhang Liru, Jiao Xuewen, Wang Jianwen. NUMERICAL INVESTIGATION ON FLOW FIELD AROUND BLADE OF WIND TURBINE UNDER YAW CONDITION BASED ON BLADE DEFORMATION[J]. Acta Energiae Solaris Sinica. 2022, 43(3): 301-305 https://doi.org/10.19912/j.0254-0096.tynxb.2020-1123

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