The change of wind speed and direction has a significantly influence on the oil film trajectory and pollution extent in the port.

风速风向的变化对油膜漂移轨迹和港区污染程度影响十分明显。

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Pitch angle control system can change pitch, accordingly regulate the rotational speed and output power by adjusting blade incidence of wind-driven device.

变桨距是通过改变风力机叶片桨距角来改变风力机的转速，从而调整发电机输出功率。

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The influence of solidity and aspect ratio on power coefficient of H-type vertical axis wind turbine, and the change of attack Angle with tip speed ratio were analyzed.

采用多流管模型分析了H型垂直风力机展弦比和实度对其功率系数的影响，并对叶片旋转过程中攻角随尖速比的变化进行了分析。

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The energy released in the updrafts then interacts with our second ingredient needed for violent tornadoes, the change of the wind direction and speed at you go upward from the ground.

CNN: The making of a nightmare tornado