周期性脉动源对风力机功率的影响

Effect of Periodic Pulsation Source on Wind Turbine Power

针对WindPACT1.5 MW机组,通过大涡模拟探究风轮5°仰角时周期性脉动源(仰角、塔影效应、偏航、风剪切)对风力机总功率的影响,并结合逆叶素动量理论,进一步分析功率与升力系数之间的联系。结果表明,仰角、塔影效应加仰角与偏航加仰角均使得风力机总功率产生“3P”的波动规律,而风剪切加仰角使得总功率产生“锯齿状”的高频率波动规律,其中偏航是总功率损失的主要因素,塔影效应是功率波动的主要因素,且发现升力系数波动规律与功率单周期内的波动规律相似。

Based on the WindPACT1.5 MW unit,the influence of periodic pulsation sources(elevation angle,tower shadow effect,yaw,wind shear)on the total power of wind turbine at 5°elevation angle is explored by large eddy simulation,and the relationship between power and lift coefficient is further analyzed by combined inverse blade element momentum theory.The results show that elevation angle,tower shadow effect plus elevation angle and yaw plus elevation angle all make the total power of wind turbine fluctuate“3 P”,while the wind shear plus elevation angle makes the total power produce“sawtooth”high frequency fluctuation law.among them,yaw is the main factor of total power loss.tower shadow effect is the main factor of power fluctuation,and it is found that the fluctuation law of lift coefficient is similar to that in a single cycle.