基于CFD的复杂地形风电机组机位微地形风资源数值模拟研究

  目的]  在复杂地形进行风电机组建设时，机位点周围易形成高边坡地形，改变了风资源分布特征，影响机组发电量和安全性能，文章旨在研究高边坡地形的影响因素和预防其对机组的危害。  方法]  基于STAR-CCM+软件平台对实际风电场机组高边坡地形进行了数值模拟，分析了立机位置选择、坡度、开挖深度等因素对机位处风资源参数的影响。  结果]  结果表明:高边坡改变了原地形风的加速效应，产生大幅度的流体分离。当高边坡位于机组上风向时，机组下叶尖易产生较大的风切变，湍流强度超标，而高边坡在机组下风向时，机位处风资源参数则正常；高边坡的坡度大小对坡前立机风参数无显著影响；当下叶尖高度低于边坡高度时，机组位置下叶尖风速很小，切变值易超标。  结论]  分析结果可为高边坡地形机组施工平台设计和塔筒高度选择提供参考。

Numerical Study on Wind Resource Around the Turbine Site for Real Complex Terrain Based on CFD Method

  Introduction]  High slope terrain is easily formed around the turbine site in complex terrain for constructing wind turbine platform, which changes the distribution characteristics of the wind resources and affects the generating capacity and safety performanc.The paper aims to get influence factors of high slope and protect wind turbine.  Method]  The numerical simulation method was applied for the high slope terrian for actual wind farm based on STAR-CCM+ software, the wind influence degree of the site selection, the slope grade and the excavation depth were studied in the paper.  Result]  It’s shown that the high slope will changes the wind acceleration effect of origin terrain resulting in large-scale fluid separation; When the high side slope is located in the upwind direction of the turbine, the large wind shear is easily generated in the lower blade tip, and the turbulence intensity exceeds the standard value, but the wind resource parameters have good performance when the high side slope is located in the downwind direction of the terrain; The gradient of high slope has no great influence on the wind parameters for the terrain in front of high slope;When the height of the turbine tip is lower than the slope’s, the wind shear will excess standard value.  Conclusion]  The results can provide reference for the turbine platform design and tower height of the high slope terrain.