Torque fluctuations caused by upstream mean flow and turbulence
Torque fluctuations caused by upstream mean flow and turbulence
复制标题
上游平均流量和湍流引起的扭矩波动
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
P. Hancock
中科院分区：
文献类型：
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作者：
T. Farr;P. Hancock
一系列研究正在进行中，通过 EnFlo 气象风洞研究涡轮机阵列尾流相互作用对一系列大气边界层状态的影响。小型三叶片风力涡轮机驱动四象限电动发电机。这里仅考虑中性流中的单个涡轮机。可以通过电流传感器以足够的灵敏度测量电动发电机电流，从而推断出平均扭矩和波动扭矩。转子前方 0.1 到 2 个直径之间的扭矩波动和流向速度波动的频谱表明，只有大规模湍流运动对扭矩波动有显着影响。上游速度和扭矩波动之间的时滞互相关在叶片内部最大。它们还显示了涡轮机上游 2 个直径范围内的湍流行为被冻结。
A series of studies are in progress investigating the effects of turbine-array-wake interactions for a range of atmospheric boundary layer states by means of the EnFlo meteorological wind tunnel. The small, three-blade model wind turbines drive 4-quadrant motor-generators. Only a single turbine in neutral flow is considered here. The motor-generator current can be measured with adequate sensitivity by means of a current sensor allowing the mean and fluctuating torque to be inferred. Spectra of torque fluctuations and streamwise velocity fluctuations ahead of the rotor, between 0.1 and 2 diameters, show that only the large-scale turbulent motions contribute significantly to the torque fluctuations. Time-lagged cross-correlation between upstream velocity and torque fluctuations are largest over the inner part of the blade. They also show the turbulence to be frozen in behaviour over the 2 diameters upstream of the turbine.