Simulations of transition and separation past a wind-turbine airfoil near stall
Simulations of transition and separation past a wind-turbine airfoil near stall
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DOI：
10.1016/j.energy.2020.118003
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发表时间：
2020-08
期刊：
影响因子：
9
通讯作者：
Wenyao Cui;Zhixiang Xiao;Xiang-jiang Yuan
中科院分区：
文献类型：
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作者：
Wenyao Cui;Zhixiang Xiao;Xiang-jiang Yuan
这种转变对风力机的气动性能和能耗具有重要影响。当迎角足够大时，分离常常发生在前缘附近的过渡处。为了同时模拟过渡和分离，开发了一种基于三方程k-ω-γ过渡/湍流集成模型（IDDES-Tr）的新改进的延迟分离涡模拟（IDDES）方法，并应用于模拟附着过渡并解决风力涡轮机翼型上的分离。基于完整湍流模型 (IDDES-FT) 的原始 IDDES 也用于与可用测量和一些具有非常密集网格的 LES 类型模拟进行比较。从数值结果来看，两者都能成功解析后缘附近的小尺度结构。此外，IDDES-Tr可以模拟前缘附近的层流分离气泡和边界层转变，而IDDES-FT则失败。因此，IDDES-Tr 的平均空气动力学比 IDDES-FT 更准确。此外，由于考虑了过渡效应的边界层发展更加准确，IDDES-Tr还提高了速度和雷诺剪应力的模拟能力。
The transition has an important effect on the aerodynamic performance and energy consumption of the wind turbine. When the angle of attack is sufficiently large, separation often occurs with transition near the leading edge. To simulate the transition and separation simultaneously, a new improved delayed detached eddy simulation (IDDES) method based on the three-equation k-ω-γ transition/turbulence integrated model (IDDES-Tr) is developed and applied to simulate the attached transition and resolve the separation past a wind-turbine airfoil. The original IDDES based on the full turbulence model (IDDES-FT) is also used for comparison with the available measurements and some LES-type simulations with very dense grids. From the numerical results, both can successfully resolve the small-scale structures near the trailing edge. In addition, IDDES-Tr can simulate the laminar separation bubble and boundary layer transition near the leading edge, whereas IDDES-FT fails. Thus, the mean aerodynamics by IDDES-Tr are more accurate than IDDES-FT. Furthermore, owing to the more accurate development of the boundary layer accounting for the transition effect, IDDES-Tr also improves the simulation capability of velocity and Reynolds shear stresses.