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Numerical Investigation on the Effects of Airfoil Leading Edge Radius on the Aerodynamic Performance of H-Rotor Darrieus Vertical Axis Wind Turbine

机译：翼型前缘半径对H-Royor Darrieus垂直轴风力涡轮机气动性能影响的数值研究

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This paper numerically investigates the effects of airfoil leading edge radius on the aerodynamic characteristics of H-rotor Darrieus vertical axis wind turbine (VAWT). 10 modified airfoils are generated by changing the leading edge radius of the base NACA 0015 airfoil from 1%c to 9%c, respectively. A 2D unsteady Computational Fluid Dynamics (CFD) model is established and validated with the previously published experimental data. The power, torque, and flow field characteristics of the rotors are analyzed. The results indicate that the maximum and minimum power coefficient at the optimum tip speed ratio (TSR) are obtained for the LE-5%c and LE-1%c model, respectively. The best aerodynamic characteristics are determined by the LE-5%c model below the optimum TSR and the LE-3%c model beyond the optimum TSR. The torque characteristics and pressure distribution for the single blades with different airfoil leading edge radius show an obvious difference in the upwind region and a very small difference in the downwind region. Moreover, the airfoil leading edge radius influences the strength, region, and diffusion rate of the vortices, being the main reason for the observed differences in instantaneous torque coefficient and power coefficient. The vortices of the LE-1%c model are stronger, larger, and diffuse slower than those of the LE-2%c and LE-5%c model at the optimum TSR.
机译：本文数值研究了翼型前沿半径对H-Royor Darrieus垂直轴风力涡轮机（VAWT）的空气动力学特性的影响。通过将基础Naca 0015翼型的前缘半径分别从1％C至9％C改变为10，改变改性翼型。建立了一个2D不稳定的计算流体动力学（CFD）模型并用先前发布的实验数据验证。分析转子的功率，扭矩和流场特性。结果表明，为LE-5％C和LE-1％C型号获得了最佳尖端速率比（TSR）的最大和最小功率系数。最佳的空气动力学特性是由低于最佳TSR的LE-5％C型号和超出最佳TSR的LE-3％C型号确定。具有不同翼型前沿半径的单叶片的扭矩特性和压力分布在上冲积区域和向下时断区域的差异显示出明显的差异。此外，翼型前沿半径影响涡流的强度，区域和扩散速率，是观察瞬时扭矩系数和功率系数差异的主要原因。 LE-1％C型号的涡流比最佳TSR的LE-2％C和LE-5％C模型更强，较大，漫射速度较强。

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