斜置翼飞机转掠升阻特性试验研究

Experimental Study on Lift Drag Characteristics of Oblique Wing Aircraft

斜置翼飞机是变体飞行器的一种,能够通过机翼转掠实现高低速气动特性兼顾,具有重要的研究价值.为了全面研究此类飞机的气动特性,开展了斜置翼飞机气动方案设计,并在航空工业气动院FL-60风洞进行了试验研究,重点分析了马赫数0.7及1.4条件下全机升阻力特性及俯仰力矩随机翼转掠角的变化规律,试验结果表明,在所研究的转掠角范围内,亚声速条件下,随着机翼转掠角的增加,全机升阻力系数逐渐减小,但升力系数减小的幅度更大,导致全机升阻比逐渐降低,全机稳定度逐渐减小,小转掠角甚至机翼不转掠是更优的飞机构型;超声速条件下,随着机翼转掠角的增加,全机升阻力系数同样逐渐减小,阻力系数首先大幅度降低,但当转掠角增加超过一定范围时,升力系数又急剧减小,导致全机升阻比先增加后降低,从升阻比最优来看,60°左右的大转掠角是更佳的超声速飞机构型;超声速条件下,相对0°转掠角的力矩参考点,全机呈不稳定状态,随着转掠角的增加,不稳定度也逐渐增大.

Oblique wing aircraft is one of the variant aircraft.It can realize the high and low speed aerodynamic characteristics through wing oblique sweep,which has important application value.In order to comprehensively study the aerodynamic characteristics of this kind of aircraft,the aerodynamic scheme design of oblique wing aircraft is carried out,and the wind tunnel test is carried out in the FL-60 wind tunnel of AVIC Aerodynamics Research Institute.The variation law of the random wing oblique angle of the whole aircraft lift drag characteristics and pitching moment under the conditions of Mach 0.7 and 1.4 is analyzed.The results show that,in the range of oblique angle studied,under subsonic conditions,with the increase of wing oblique angle,the lift drag coefficient is larger,which results in the gradual decrease of lift-drag ratio,the stability of the whole aircraft decreases gradually,small oblique angle is a better aircraft configuration.Under supersonic conditions,with the increase of wing oblique angle,the lift drag coefficient of the whole aircraft also gradually decreases,and the drag coefficient first decreases significantly,however,when the oblique angle increases beyond a certain range,the lift coefficient decreases sharply,which results in the lift drag ratio of the whole aircraft's first increase and then decrease.A large oblique angle of about 60°is a better supersonic aircraft configuration.Under supersonic conditions,the whole aircraft is in unstable state,With the increase of wing oblique angle,the instability increases gradually.