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首页> 外文期刊>Energy Conversion & Management >Numerical study on the aerodynamics of an experimental wind turbine: Influence of nacelle and tower on the blades and near-wake
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Numerical study on the aerodynamics of an experimental wind turbine: Influence of nacelle and tower on the blades and near-wake

机译：实验风力涡轮机空气动力学的数值研究：机舱和塔对叶片和近尾的影响

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摘要

The nacelle and tower affect the flow through the rotor and near-wake of horizontal-axis wind turbines. For this reason, aerodynamic models of the full geometry of wind turbines are needed to gain insight to improve turbine designs. In this work, the unsteady flow around an experimental horizontal-axis wind turbine is studied using computational fluid dynamics simulations. The emphasis is put on the effects of the nacelle, tower and rotation of the blades on the induction region and near-wake. The simulations are performed using unsteady ReynoldsAveraged Navier-Stokes equations in conjunction with the shear-stress transport k-? model. The sliding mesh method is employed to enable the rotation of the blades. The simulations were performed at the design tip speed ratio (? = 6.67) and two off-design conditions (? = 4.17 and 10) to assess the general validity of the numerical model. The obtained results of global loads, force distribution on the blades and tower, velocity components and angle of attack are presented in detail. It is found that the tower has little effect on the rotor loads (circular pattern), but the blades have an important effect on the tower (three-leaved rose pattern). The force distribution reveals only significant fluctuations on the blades (r/R 0.75) at ? = 4.17, whereas the tower is affected in the zone exposed to the wake behind the rotor for all three wind speeds. Furthermore, the interaction between blades is evaluated in terms of velocity and angle of attack. The correspondence between the results for different rotor blade positions reveals the effect of the ground on the rotor is negligible. The Omega method is used to visualize the behaviour of the tip and root vortices, wake expansion, coherent structures and development of the nearwake. The numerical results presented here contribute to a deeper understanding of the unsteady flow around horizontal-axis wind turbines.
机译：机舱和塔通过转子的流动和横轴风力涡轮机的近似。因此，需要风力涡轮机的全部几何形状的空气动力学模型来获得改善涡轮机设计的洞察力。在这项工作中，使用计算流体动力学模拟研究了实验水平轴风力涡轮机周围的不稳定流。重点是机舱，塔，叶片旋转在感应区域和近尾的影响。使用不稳定的Reynoldsaveraged Navier-Stokes方程与剪切应力传输k-一起进行模拟。模型。采用滑动网格方法来实现叶片的旋转。模拟以设计尖端速比（？= 6.67）和两个非设计条件（？= 4.17和10）进行，以评估数值模型的一般有效性。得到了全局载荷的结果，刀片和塔架上的力分布，速度分量和攻角分布。结果发现，塔对转子载荷（圆形图案）影响不大，但叶片对塔（三叶玫瑰图案）具有重要作用。力分布在叶片上仅显示出显着波动（R / R <0.75）？ = 4.17，而塔在区域暴露于转子后面的区域以进​​行所有三个风速。此外，根据速度和攻角评估叶片之间的相互作用。不同转子叶片位置的结果之间的对应关系显示出地面在转子上的效果可以忽略不计。 ω方法用于可视化尖端和根涡流的行为，唤醒膨胀，相干结构和接近跳动的开发。呈现的数值结果有助于更深入地了解水平轴风力涡轮机周围的不稳定流动。

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