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首页> 外文期刊>Journal of Energy Resources Technology >A Computational Fluid Dynamics Investigation on the Axial Induction Factor of a Small Horizontal Axis Wind Turbine
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A Computational Fluid Dynamics Investigation on the Axial Induction Factor of a Small Horizontal Axis Wind Turbine

机译：小横轴风力涡轮机轴向诱导因子的计算流体动力学研究

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The evolution of wind and hydrokinetic turbines stimulated the development of several tools to evaluate and to predict horizontal axis rotor behavior. From this perspective, the blade element momentum methods stand out as one of the most common approaches due to its reliability and computing speed. In the classical blade element momentum, the axial induction factor is a crucial variable to compute correctly the turbine parameters. Usually, the axial induction is determined by an interactive process that balances the forces at blade sections with momentum equations. The forces are computed based on the airfoil polars evaluated at each blade section with local inlet velocity. This procedure assumes that the swirl terms are linearized, where the lateral pressure forces is neglected. In order to evaluate these tri-dimensional effects on the blade element momentum method, the present work introduces a different methodology to determine the axial induction factor employing computational fluid dynamics simulations. The method was applied for a full-scale horizontal axis rotor with three blades and I m of diameter, with wind tunnel experiments for validation. The axial induction factor obtained with the new technique was compared to the classical blade element momentum method. The results show axial induction factor variations along the radial and axial coordinates. An analogy with Glauert power coefficient limit was made, finding a specific limit curve for the tested turbine, and, moreover, a correlation between turbine firing speed and induction factor.
机译：风力和水力涡轮机的演变刺激了几种工具的开发来评估和预测水平轴转子行为。从这个角度来看，刀片元件动量方法是由于其可靠性和计算速度而最常见的方法之一。在典型的刀片元件动量中，轴向感应因子是计算涡轮机参数的正确变量。通常，轴向诱导通过交互过程确定，该互动过程使得具有动量方程的刀片部分处的力。基于在每个刀片部分的翼型点计算具有局部入口速度来计算的力。该过程假定旋流术语是线性化的，其中横向压力被忽略。为了评估对叶片元件动量方法的这些三维效应，本作者引入了不同的方法，以确定采用计算流体动力学模拟的轴向感应因子。该方法应用于具有三个刀片的全尺度水平轴转子，直径为直径，风洞实验进行验证。将使用新技术获得的轴向感应因子与经典刀片元件动量法进行比较。结果显示沿径向和轴向坐标的轴向感应因子变化。对Glauert功率系数限制进行了类比，找到了测试涡轮机的特定限制曲线，而且，涡轮机射击速度和诱导因子之间的相关性。

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