Combined effect of passive vortex generators and leading-edge roughness on dynamic stall of the wind turbine airfoil

Zhu Chengyong; Qiu Yingning; Feng YanhuiWang TongguangLi Hui

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Combined effect of passive vortex generators and leading-edge roughness on dynamic stall of the wind turbine airfoil

机译：Combined effect of passive vortex generators and leading-edge roughness on dynamic stall of the wind turbine airfoil

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Dynamic stall causes the highly unsteady and nonlinear aerodynamic loads on wind turbines. Recently, dynamic stall with passive vortex generators (VGs) and leading-edge roughness (LER) has received considerable attention, but independently. Therefore, this paper presents a careful investigation into dynamic stall of the NREL S809 airfoil with both VGs and LER to reveal their combined effect. Fully-resolved URANS simulations are conducted to identify the unsteady flow characteristics, and equivalent sand-grain roughness is used to model LER. LER significantly increases the turbulence kinetic energy (TKE) and suction loss at the leading edge, thereby causing the earlier onsets of separated flow and dynamic stall. Increasing roughness height generally reduces linear liftcurve slope, increases aerodynamic hysteresis and makes the separated flow hard to be reattached. VGs increase near-wall TKE via streamwise vortices and effectively suppress the separated flow. Dynamic stall is therefore significantly delayed by VGs with higher maximum lift, and aerodynamic hysteresis is also greatly reduced with the flow reattachment accelerated. Interestingly, serious LER may cause strong vortical disturbances and change the dynamic stall behaviors from light stall into deep stall. Double-row VGs are also found better than single-row VGs in improving the aerodynamic performance of roughened airfoil. These findings imply that VGs effectively control dynamic stall and diminish the adverse LER effect. This study should advance the control of unsteady loads on wind turbines suffering from harsh environmental conditions.

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来源
《Energy conversion & management》 |2022年第1期|115015.1-115015.13|共13页
作者
Zhu Chengyong; Qiu Yingning; Feng YanhuiWang TongguangLi Hui;
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作者单位

Nanjing Univ Sci & Technol, Sch New Energy, Fu Xing 8, Jiangyin 214443, Peoples R China|Nanjing Univ Aeronaut & Astronaut, Jiangsu Key Lab Hi Tech Res Wind Turbine Design, Nanjing 210016, Peoples R China;

Nanjing Univ Sci & Technol, Sch Energy & Power Engn, Nanjing 210094, Peoples R China;

Nanjing Univ Aeronaut & Astronaut, Jiangsu Key Lab Hi Tech Res Wind Turbine Design, Nanjing 210016, Peoples R ChinaShenyang Univ Technol, Sch Architecture & Civil Engn, Shenyang 110870, Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Vortex generators; Leading-edge roughness; Dynamic stall; Wind turbine; URANS simulations;

Combined effect of passive vortex generators and leading-edge roughness on dynamic stall of the wind turbine airfoil

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