论文部分内容阅读
对600kW单风轮和7倍风轮直径(7D)间距的两风轮水平轴风力机在不同来流风速条件进行三维流场数值模拟。结果显示:风力机下游流场存在三维速度流动,轴向速度在尾迹区存在明显亏损,且随尾迹向下游的发展,轴向速度亏损逐渐减少。不同来流风速条件下风轮尾迹流的发展有一定区别,在来流风速较低的条件下尾流风速恢复较快。风场在布置风力机时应考虑当地的风速条件,若多数情况在额定风速或超过额定风速工况下运行,则前后风轮间距应大于7倍风轮直径;否则可考虑缩短前后风轮间距。
The two-rotor horizontal-axis wind turbine with 600kW single-rotor and seven-times rotor diameter (7D) spacing was used to simulate the three-dimensional flow field at different wind speeds. The results show that there is a three-dimensional velocity flow in the downstream flow field of the wind turbine. There is a significant loss of the axial velocity in the wake region. With the development of the wake downstream, the axial velocity loss gradually decreases. Under different conditions of wind speed, the development of wind turbine wake has some differences. The wind speed of wake changes quickly under the conditions of lower wind speed. Wind farms should consider the local wind speed conditions when laying wind turbines. If they are operating at rated wind speed or rated wind speed in most cases, the distance between the front and rear wind wheels should be greater than 7 times the diameter of the rotor; otherwise, the distance between the front and rear rotor can be reduced .