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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。
Through wind tunnel test, the influence of variable sine front on the aerodynamic performance of straight wing was studied. The variable front of the sine is a flat plate, installed in the NACA0015 straight wings before the stagnation station, and can freely stretch and retract. The results of wind tunnel experiment show that the straight wing exhibits a gentle stalling characteristic when the variable sine front is installed, and the lift coefficient after stalling is improved to some extent. The aerodynamic performance at high angles of attack is improved. The research on the influence of the variable sine front extension on the aerodynamic performance shows that the extension length is an important parameter that affects the aerodynamic performance of the wing. Only when the extension length is small, the aerodynamic performance can be obtained.