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首页> 外文会议>Wind energy symposium 2018 >NUMERICAL STUDY OF TRANSITIONAL UNSTEADY BOUNDARY LAYER ON WIND TURBINE AIRFOIL USING HYBRID RANS/LES TURBULENCE MODEL
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NUMERICAL STUDY OF TRANSITIONAL UNSTEADY BOUNDARY LAYER ON WIND TURBINE AIRFOIL USING HYBRID RANS/LES TURBULENCE MODEL

机译：基于混合兰斯/莱斯湍流模型的风机翼型过渡非稳态边界层数值研究。

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摘要

A hybrid RANS/LES turbulence model integrated with transition formulation is developed and tested by a surrogate model problem through joint experimental and computational fluid dynamic approach. The model problem consists of a circular cylinder for generating coherent unsteadiness and a downstream airfoil in the cylinder wake. The cylinder flow is subcritical, with a Reynolds number of 64,000 based upon the cylinder diameter. The quantitative dynamics of vortex shedding and Reynolds stresses in the cylinder near wake were well captured, owing to the turbulence-resolving large eddy simulation method that was invoked in the wake. The hybrid model switched between RANS/LES mode outside boundary layer as expected. According to the experimental and simulation results, the airfoil encountered local flow angle variations up to ±50°. Further processing the data through phase-averaging technique found phase lags along the chordwise locations and both the phase-averaged and mean profiles collapsed into the Law-of-the-wall in the range of 0 < y~+ < 50. The features of high blade loading fluctuations due to unsteadiness and transitional boundary layers are of interest in the aerodynamic studies of full-scale wind turbine blades, making the model problem a comprehensive benchmark case for future model development and validation.
机译：通过一个联合模型问题，通过联合实验和计算流体动力学方法，开发了一种与过渡配方相结合的混合RANS / LES湍流模型，并对其进行了测试。模型问题包括一个用于产生相干不稳定的圆柱体，以及圆柱体尾流中的下游翼型。气缸流量是次临界的，基于气缸直径，雷诺数为64,000。由于在尾流中调用了解决湍流的大涡模拟方法，因此可以很好地捕获尾流附近圆柱体中的涡旋脱落和雷诺应力的定量动力学。混合模型按预期在边界层外部的RANS / LES模式之间切换。根据实验和仿真结果，机翼遇到的局部流角变化高达±50°。通过相位平均技术进一步处理数据，发现沿弦向位置存在相位滞后，并且相位平均和均值轮廓均在0

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  • 来源
    《Wind energy symposium 2018》|2018年|510-526|共17页
  • 会议地点 Kissimmee(US)
  • 作者

    DI ZHANG; DANIEL R. CADEL; ERIC G. PATERSON; K. TODD LOWE;

  • 作者单位

    Kevin T. Crofton Department of Aerospace and Ocean Engineering Virginia Tech, Blackshurg, VA 24061 USA;

    Kevin T. Crofton Department of Aerospace and Ocean Engineering Virginia Tech, Blackshurg, VA 24061 USA;

    Kevin T. Crofton Department of Aerospace and Ocean Engineering Virginia Tech, Blackshurg, VA 24061 USA;

    Kevin T. Crofton Department of Aerospace and Ocean Engineering Virginia Tech, Blackshurg, VA 24061 USA;

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