风向变化对风力机尾流影响的数值分析  

Numerical Analysis on Wake Effect of Wind Turbines at Varying Wind Directions

作　　者：胡丹梅[1] 霍能萌 杨官奎 张建平[1] 

机构地区：[1]上海电力学院能源与机械工程学院,上海200090

出　　处：《动力工程学报》2017年第1期60-65,共6页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(50706025);江苏省水利动力工程重点实验室资助项目(K13024);中国电力科学研究院资助项目(1512-00795);上海市教委科研创新重点资助项目(14ZZ154)

摘　　要：为了探究风向变化对风力机尾流的影响,选取NREL 5MW风力机建立模型,采用Fluent软件在额定工况下对单台风力机及风向变化时的2台风力机进行数值模拟,并对比其输出功率及尾流的流动情况.结果表明:当风向变化角为0°,即串列排布时,上游风力机对下游风力机的影响很大;随着风向变化角由5°增大到10°,上游风力机对下游风力机的影响逐渐减小,下游风力机的功率减小率由7.53%减小到4.24%,输出功率明显增加,可见风向变化对风力机尾流有影响.To study the wake effect of wind turbines at varying wind directions, the NREL 5 MW wind turbine model was esteblished and then a single wind turbine and two wind turbines were respectively simula- ted at varying wind directions under rated wind condition using Fluent software, so as to compare their power output and wake flow. Results show that when the wind direction is at 0°, namely tandem arrangement, the upstream wind turbine would have a big effect on the downstream one; when the angle of wind direction varies from 5°to 10°, the influence of upstream wind turbine on downstream wind turbine would be reduced, and the power loss of downstream wind turbine would be lowered from 7. 53% to 4.24%. with obvious increase of power output simultaneously, indicating that the wake flow of a wind turbine may be affected by the change of wind directions.

关 键 词：风力机 尾流 风向变化 功率损失 数值模拟 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]