本研究定量探討水平軸式風力發電機風洞實驗時，其功率靜、數受到風洞阻塞效應的影響。阻塞因
子((U_T/U_F)^3)，是利用皮管量測風洞有轉子時之風速(U_T)無轉子時之風速(U_F)計算而得。研究結果
顯示阻塞因子和轉子的尖速比、葉片的螺距角及風洞阻塞比有很明顯的關連，越大的尖速比與阻塞比
，但阻塞因子越小，而尖速比達到某定值時，阻塞因子接近一個常數值。而在阻塞比只有10% 時，其
阻塞效應低於5% ;當尖速比小、或葉片螺距角在25 度時，阻塞效應已低至可忽略， 功率像數無需作修正。 This study quantitatively investigates the effects of tunnel blockage on the turbine power coefficient in
with tunnel tests of small horizontal-axis wind turbines (HAWTs). The blockage factor (BF), ((U_T/U_F)^3) , was
UF
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. This study also shows that the blockage
correction is less than 5% for a BR of 10%. No blockage correction is necessary for small TSR under all of
the investigated conditions, and for the investigated blade pitch angle of 25°.
