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On the application of the Jensen wake model using a turbulence-dependent wake decay coefficient: the Sexbierum case

机译：关于使用依赖于湍流的尾波衰减系数的詹森尾波模型的应用：Sexbierum案例

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We present a methodology to process wind turbine wake simulations, which are closely related to the nature of wake observations and the processing of these to generate the so-called wake cases. The method involves averaging a large number of wake simulations over a range of wind directions and partly accounts for the uncertainty in the wind direction assuming that the same follows a Gaussian distribution. Simulations of the single and double wake measurements at the Sexbierum onshore wind farm are performed using a fast engineering wind farm wake model based on the Jensen wake model, a linearized computational fluid dynamics wake model by Fuga and a nonlinear computational fluid dynamics wake model that solves the Reynolds-averaged Navier-Stokes equations with a modified k-epsilon turbulence model. The best agreement between models and measurements is found using the Jensen-based wake model with the suggested post-processing. We show that the wake decay coefficient of the Jensen wake model must be decreased from the commonly used onshore value of 0.075 to 0.038, when applied to the Sexbierum cases, as wake decay is related to the height, roughness and atmospheric stability and, thus, to turbulence intensity. Based on surface layer relations and assumptions between turbulence intensity and atmospheric stability, we find that at Sexbierum, the atmosphere was probably close to stable, although the stability was not observed. We support these assumptions using detailed meteorological observations from the HOvsOre site in Denmark, which is topographically similar to the Sexbierum region. (c) 2015 The Authors. Wind Energy published by John Wiley & Sons Ltd.
机译：我们提出了一种处理风力涡轮机尾流仿真的方法，该方法与尾流观测的性质以及产生所谓的尾流情况的处理密切相关。该方法涉及在一定范围的风向上平均大量的尾流模拟，并假设其遵循高斯分布，部分考虑了风向的不确定性。使用基于Jensen尾流模型的快速工程风场尾流模型，Fuga的线性化计算流体动力学尾流模型以及可解决以下问题的非线性计算流体动力学尾流模型，对Sexbierum陆上风电场的单尾流和双尾流测量进行了仿真。雷诺平均Navier-Stokes方程和改进的k-ε湍流模型。使用基于Jensen的唤醒模型和建议的后处理，可以找到模型与测量之间的最佳一致性。我们表明，在应用于塞比鲁姆的情况下，詹森尾迹模型的尾迹衰减系数必须从常用的陆上值0.075降低到0.038，因为尾迹衰减与高度，粗糙度和大气稳定性有关，因此，湍流强度。基于表层关系和湍流强度与大气稳定性之间的假设，我们发现塞比鲁姆峰的大气可能接近稳定，尽管未观察到稳定。我们使用丹麦HOvsOre站点的详细气象观测结果来支持这些假设，该站点的地形与Sexbierum地区相似。 （c）2015作者。约翰·威利父子有限公司出版的《风能》。

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