本文以开发低雷诺数下优良气动特性翼段为目标,对以NACA634-021翼型为基型的光滑翼段和仿生翼段模型,在0°~90°攻角,雷诺数Re=2×105的条件下,采用五分量测力天平和粒子图像测速仪(PIV)于直流风洞中分别测量升阻力等翼型气动特性和流场特性.结果表明:仿生翼段的失速特性更为平缓,失速后升力系数提高21%,升阻比增加23%,阻力系数减小3%,在30°~80°大攻角区具有一定增升减阻效果.作用机理:改变了光滑翼型的边界层分离模式,加强了边界层内部和外部势流的动量交换,进而增强了吸力面流场抵御逆压梯度的能力,使得流动分离推迟,失速得以延缓.
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