Abstract The enhancement of aerodynamic performance of airfoil using Gurney flap was demonstrated and due to its effects of lift increasing and stall suppression on airfoil, Gurney flap has positively functioned in a wide range of engineering. Though there had been numerous scholars who aroused wide concern on geometric parameters of Gurney flap for airfoil, the investigation of geometric design of Gurney flap for straight-bladed vertical axis wind turbine is absent. In current research, a comprehensive numerical study on the effect of geometric parameters of Gurney flap on performance enhancement of straight-bladed vertical axis wind turbine. Before a validation between numerical results and experimental data was carried out, a novel mathematical model of resistance torque of struts was put forward to increase the reliability of numerical model. The results show that the Gurney flap can remarkably promote the aerodynamic performance of vertical axis wind turbine with a decreased rotational velocity. The maximum improvement can reach up to 21.32%. In upstream area, Gurney flap can considerably increase the blade tangential force. Short-Gurney-flap blade can effective weaken the deficiency of aerodynamic loss in downstream area. The 0.75%-chord-length height is most appropriate for the straight-bladed vertical axis wind turbine in this paper. The aerodynamic load with Gurney flap is not sensitive to width. The design with 0.12%-chord-length width is the most suitable value through analyzing the power coefficient curve.

中文翻译：

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格尼襟翼几何参数对直叶垂直轴风力机性能提升的影响

摘要 证明了格尼襟翼对机翼气动性能的增强，由于其对机翼升力和失速抑制的作用，格尼襟翼在广泛的工程中发挥了积极作用。尽管曾有众多学者对翼型格尼襟翼几何参数引起广泛关注，但对直叶垂直轴风力机格尼襟翼几何设计的研究却很少见。在目前的研究中，对格尼襟翼几何参数对直叶垂直轴风力机性能提升影响的综合数值研究。在对数值结果与试验数据进行验证之前，提出了一种新的支柱阻力矩数学模型，以提高数值模型的可靠性。结果表明，格尼襟翼在降低转速的情况下可以显着提高垂直轴风力机的气动性能。最大提升可达21.32%。在上游区域，格尼襟翼可以显着增加叶片切向力。短格尼襟翼叶片可有效削弱下游区域气动损失的不足。0.75%弦长高度最适合本文的直叶垂直轴风力机。带 Gurney 襟翼的空气动力载荷对宽度不敏感。通过对功率系数曲线的分析，0.12%弦长宽度的设计是最合适的值。最大提升可达21.32%。在上游区域，格尼襟翼可以显着增加叶片切向力。短格尼襟翼叶片可有效削弱下游区域气动损失的不足。0.75%弦长高度最适合本文的直叶垂直轴风力机。带 Gurney 襟翼的空气动力载荷对宽度不敏感。通过对功率系数曲线的分析，0.12%弦长宽度的设计是最合适的值。最大提升可达21.32%。在上游区域，格尼襟翼可以显着增加叶片切向力。短格尼襟翼叶片可有效削弱下游区域气动损失的不足。0.75%弦长高度最适合本文的直叶垂直轴风力机。带 Gurney 襟翼的空气动力载荷对宽度不敏感。通过对功率系数曲线的分析，0.12%弦长宽度的设计是最合适的值。带 Gurney 襟翼的空气动力载荷对宽度不敏感。通过对功率系数曲线的分析，0.12%弦长宽度的设计是最合适的值。带 Gurney 襟翼的空气动力载荷对宽度不敏感。通过对功率系数曲线的分析，0.12%弦长宽度的设计是最合适的值。