风电机组绕流格劳艾特校正的数值改进

J. Wanderley, C. Levi
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引用次数: 0

摘要

准确可靠地计算风力机的气动特性对于开发新的高效设计具有重要意义。采用可渗透圆盘(PD)来模拟风力机周围的流动,通过非定常reynolds - average Navier-Stokes方程(URANS)求解,本文将其命名为PD/URANS方法。采用有限体积法和全变分递减(TVD)格式对流动控制方程进行数值求解。利用单方程湍流模型对风力机尾迹湍流进行了模拟。在Glauert校正计算中,考虑了施加在虚拟渗透盘上的均匀法向力分布(CT),而轴向诱导因子则直接从URANS方程的数值解中获得。得到的数值轴向感应系数与格劳艾特校正相当吻合,除非涡轮后的流动高度不稳定且依赖于雷诺数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical improvement to Glauert correction for the flow around a wind turbine
Accurate and reliable computation of the aerodynamic characteristics of wind turbines is very important for the development of new efficient designs. The flow around a wind turbine is modeled by a permeable disc (PD), solved through the Unsteady Reynolds-Averaged Navier–Stokes equations (URANS), here named PD/URANS method. The finite volume method and a total variation diminishing (TVD) scheme solve numerically the flow governing equations. The turbulent flow in the wake of the wind turbine is simulated utilising a one-equation turbulence model. The Glauert correction calculation considers a uniform normal force distribution (CT) on the virtual permeable disc applied to the flow, while the axial induction factor is obtained directly from the numerical solution of the URANS equations. The numerical axial induction factor obtained agrees fairly well with Glauert correction, except if the flow behind the turbine is highly unsteady and Reynolds number dependent.
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