可变正弦前缘对直机翼气动性能影响的研究

通过风洞测力实验,研究了可变正弦前缘对直机翼气动性能的影响。可变正弦前缘为平板式,安装于NACA0015直机翼的前驻点处,并能自由伸展与缩回。风洞实验结果表明：加装可变正弦前缘后,直机翼呈现出缓失速特性,失速后的升力系数均有不同程度的提高,大迎角下的气动性能得到改善。可变正弦前缘伸展长度对气动性能的影响研究表明,其伸展长度是影响机翼气动性能的重要参数,只有伸展长度较小时,才能获得较好的气动性能。

Effects of variable sinusoidal leading-edge on the aerodynamic performance of a straight wing

Force measurements were carried out in a low speed wind tunnel to examine the aerodynamic performance of a straight wing installed with different wave-like variable sinusoidal leading-edges,which imitated the leading-edges of a humpback’s flipper.The variable sinusoidal leading-edges were made of aluminum plate and placed in the slot which was assigned along the leading-edge of the wing.These variable leading edges can be extended and retracted according to different flying conditions.Results have shown that with the installation of variable sinusoidal leading-edges,＂gradual stall＂characteristic and lift enhancement after stall can be obtained;and the lift performance of the straight wing at high angle of attack is highly improved.The results also indicate that only when the extend length of the variable sinusoidal leading-edge is short,better aerodynamic performance for the straight wing can be achieved.