停机状态叶片位置对风力机体系气动性能影响

Impact for blade position on aerodynamic performance of wind turbine system under stopped status

为了研究停机状态下叶片不同位置对风力机体系气动性能的影响程度,以南京航空航天大学自主研发的3 MW水平轴风力机为研究对象,采用大涡模拟(LES)方法对停机状态下叶片不同位置时的风力机体系气动性能进行数值模拟.基于8种计算工况(由叶片旋转全过程状态下和塔架的相对位置确定)下的三维非定常数值模拟结果,研究风力机体系表面空间风压分布特性及周围流场的作用机理,总结出不同停机状态下叶片位置对风力机气动性能和干扰效应的影响规律.结果表明,叶片停机位置对风力机体系表面风压分布和绕流特性的影响显著,上游叶片的遮挡效应对塔架迎风面和侧面产生显著影响,随着塔架与叶片相对位置的接近,塔架背风面尾涡区域变得细长且不规则.

The 3 MW wind turbine developed by Nanjing University of Aeronautics and Astronautics wasstudied in order to analyze the impact for blade position on aerodynamic performance of wind turbine systemunder stopped status. Different blades positions on aerodynamic performance of wind turbine understopped status were simulated by large eddy simulation. The space of wind pressure distribution characteristicsand mechanism of flow field were analyzed based on three-dimensional unsteady numerical simulationresults of eight calculation conditions which are determined by relative position between blades and towerin the whole process of blade rotation. The regularity of blade position effects on aerodynamic performanceand interference effect under stopped status was summarized. Results showed that wind pressure distributionon the surface of wind turbine system and flow characteristics were significantly affected by the bladestopped position, and shade effect of blade significantly impacted tower leeward and sides. Trailing vortexarea of tower leeward became thin and irregular with the approaching of relative position between towerand blade.