复杂地形风电场中风加速效应的实验研究

Experimental Study on Wind Acceleration Effect in Wind Farms with Complex Terrain

坡地的存在使得平地来流经过一定高度差后速度增大,产生了风加速效应。通过在某山地风场进行风场实验,获得坡地风场的流场数据,研究了坡地地形对风加速效应的影响。结果表明:加速效应与坡地海拔高度有关,实验中高海拔处实测加速比仅为Taylor原始算法预测加速比的16.9%左右。坡度大小和风向是另外2个影响加速效应的因素。通常坡度越大,加速效应越明显,实验中较大坡度处的加速比偏大61.6%左右;侧风坡面的加速比较迎风坡面偏大10%左右。此外,分析Taylor原始算法产生误差的原因,给出适用复杂地形的Taylor方法修正式。

Sloping land makes the speed of the inflow on the flat land increase after a certain height difference,which results in the wind acceleration effect.Experiments were conducted in a mountain wind farm to obtain the flow field data of the slope wind field and study the influence of slope terrain on the wind acceleration effect.Experimental results show that the acceleration effect is related to the altitude of the slope,and the measured acceleration ratio at high altitudes is only about 16.9%of that predicted by Taylor’s original algorithm.Moreover,both the slope and the wind direction are also factors affecting the acceleration effect.Generally,the acceleration effect becomes more prominent when the slope is greater.In this experiment,the acceleration ratio in the positions with a larger slope is increased by 61.6%,and the acceleration ratio on the crosswind side of the slope is about 10%larger than that on the windward side.Meanwhile,the reasons for errors generated by Taylor’s original algorithm are analyzed,and the modified formula of Taylor’s method suitable for complex terrain is proposed in this paper.