Taken the cut-in and cut-off wind speed of wind turbine into account, a concept named active wind power density was presented.
通过对风功率密度进行分析，考虑到风机工作风速区间，提出有功风功率密度概念。
The boat clawed off slowly until it reached the wind, when the sails filled and the boat gathered speed.
船慢慢驶进风中直到船帆被风鼓起且船速渐增。
The invention relates to an auto on-off loose-leaf wind power machine which can gather energy to increase the speed.
本发明涉及一种聚能增速自动开合活叶式风力机。
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