风力机风轮设计中风速的处理

风力发电是风能利用的最好形式.随着单机容量的不断增大，风力机的整体尺寸也越来越大，包括塔架高度.一般情况下，无穷远来流风速随高度的增加而逐渐增大.所以在设计大功率水平轴风力机风轮时，风轮设计者是否要考虑无穷远来流风速在铅垂高度等于直径的范围内的速度梯度将是一个值得注意的问题.为准确计算风轮的气动特性，就必须针对这一速度变化范围用合理的方法给定设计风速.分析并证明了用风轮中心处的速度作为设计风速是相当合理的.

Treatment of wind speed in design of wind turbine rotor

Electricity generation by wind power is the best application form of wind energy. With the increase in the capacity of a wind turbine, its size including tower height is getting larger and larger. Generally, the wind speed of oncoming flow gradually enhance with the increase of height. Consequently, for designing the rotor of a large-power horizontal-axis wind machine with bigger rotor diameter, whether the gradient of wind speed of oncoming flow in front of the rotor should be considered will be a problem for designers of wind turbines. For realizing the accurate calculation of aerodynamic characteristics of the rotor, the design of wind speed must be given using a reasonable method. It is analyzed and verified that the aerodynamic design of the rotor will be fairly reasonable by taking wind speed at the rotor center as the designed wind speed.