Blockage corrections in wind tunnel tests of small horizontal-axis wind turbines
Blockage corrections in wind tunnel tests of small horizontal-axis wind turbines
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DOI：
10.1016/j.expthermflusci.2010.12.005
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发表时间：
2011-04
影响因子：
3.2
通讯作者：
T. Y. Chen;L. Liou
中科院分区：
文献类型：
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作者：
T. Y. Chen;L. Liou
本研究定量研究了小型水平轴风力涡轮机（HAWT）风洞试验中隧道堵塞对涡轮机功率系数的影响。阻塞系数 (BF)，[公式：见正文]，是通过在各种测试条件下使用皮托静压管测量有和没有转子的隧道速度来确定的。结果表明，BF 在很大程度上取决于转子叶尖速比 (TSR)、叶片桨距角 (β) 和隧道堵塞比 (BR)。 TSR和BR越大，BF越小。当TSR超过一定值时，BF接近恒定值。对于所有研究条件下的小 TSR 以及所研究的 25° 叶片桨距角，无需进行阻塞校正。这项研究还表明，对于 10% 的 BR，阻塞校正小于 5%，这证实了文献中 BR 小于 10% 的阻塞校正是不可接受的。
This study quantitatively investigates the effects of tunnel blockage on the turbine power coefficient in wind tunnel tests of small horizontal-axis wind turbines (HAWTs). The blockage factor (BF), [Formula: see text] , was determined by measuring the tunnel velocities with and without rotors using a pitot–static tube under various test conditions. Results show that the BF depends strongly on the rotor tip speed ratio (TSR), the blade pitch angle (β), and the tunnel blockage ratio (BR). The larger the TSR and BR are, the smaller the BF is. The BF approaches a constant value when the TSR exceeds a certain value. No blockage correction is necessary for small TSR under all of the investigated conditions, and for the investigated blade pitch angle of 25°. This study also shows that the blockage correction is less than 5% for a BR of 10%, which confirms that no blockage correction for a BR less than 10% in literatures is acceptable.