涡量反演尾流场特性研究

Investigation on the characteristics of vortex reconstructed wake

尾流场的快速计算具有重要的科学意义及工程应用价值。文章从涡量控制方程出发,构建了一种尾流快速计算方法,并基于快速计算方法对平板尾流进行了模拟分析。快速计算方法可以准确地模拟平板尾流区卡门涡街的形成与演化。通过与前人研究结果对比,验证了快速计算方法的可靠性。通过对尾流剖面进行分析,发现尾流场中不同湍流统计量达到自相似状态的位置并不相同,且在平板尾流上游区域存在一个非平衡态自相似区域。相关研究成果不仅有助于阐明湍流尾流特性,而且对风电场尾流预测与控制等工程应用场景具有重要指导意义。

The rapid simulation of wake flow has important scientific significance and engineering application.In this paper,a fast calculation method is constructed based on the equation of vortex,and a plane wake is simulated and investigated based on this method.The reliability of this method is validated through comparison with results from previous studies.It is found that this fast calculation method can accurately simulate the formation and evolution of Karman vortex street in the wake region.Analysis of the wake profiles reveals that the positions at which different turbulence statistics reach a self-similar state vary,and a non-equilibrium self-similar region is observed upstream of the wake.The results of the present study not only enhance our understanding of turbulent wake characteristics,but also be of significance for engineering applications,such as predicting and controlling wind turbine wakes in wind farms.