中文摘要：

为了研究风力机在不同来流风速下和额定风速下运行时的尾流情况，采用数值模拟计算的方法，对美国可再生能源实验室（NREL）5MW风力机进行建模并选择不同来流风速进行数值模拟计算．通过模拟计算数据可以看出，风力机下游的风速在0D～4D区域内恢复迅速，在4D～12D区域内恢复缓慢，在12D～16D区域内恢复迅速．其中，在风力机下游6D距离处，来流风速恢复到接近来流风速的60％，在20D处恢复到来流风速的92．8％．由此表明，初始来流风速越大，风力机下游风速越容易恢复到初始风速，并且可以认为在下游20D处下游风力机不再受上游风力机的影响．

英文摘要：

In order to study the wake of the wind turbine running in different wind speeds and the rated wind speed, the American Renewable Energy Laboratory（ NREL）SMW wind turbine is modeled and simulated at different flow velocity. The data of simulation show that in the downstream 0D ～4D area there can be a rapid recovery of wind speed, and in the 4D ～ 12D area the wind speed recovers slowly, and in the 12D ～16D area the wind speed recovers rapidly again. In the distance of 6D downstream wind speed can recover to about 60% of the initial speed,while in the distance of 20D downstream wind speed can recover to 92.8% of the same. The result shows that the downstream wind speed can recover to the initial speed more easily if it has a bigger initial wind speed, and there is no wake effect in about 20D downstream.