论文部分内容阅读
运输机采用扁平后体的设计形式可使舱门结构简单、重量轻,并且舱门机构的可靠性高,具有很好的使用性。但是扁平后体在巡航时横向流动比较严重,造成横向逆压梯度大且后体边界层易出现分离形成旋涡流动,带来压差阻力的增加。并且,后体分离涡在偏航时使垂尾两侧压力分布变差,降低了航向稳定性。导流片是特别针对扁平后体所采用的特殊气动力部件。其能够对后体涡的生成和发展进行抑制,削弱后体低压区,降低压差阻力;在偏航状态下,导流片改变了垂尾和后体的压力分布形态,可有效增加航向稳定性。导流片的减阻增稳作用使得采用扁平后体的运输机装载效率和气动特性得以兼顾。
Transport aircraft with a flat rear body design allows the door structure is simple, light weight, and the door mechanism of high reliability, with good usability. However, when the flat rear body cruises laterally, the lateral flow is rather serious, resulting in a large lateral pressure gradient and easy separation of the rear body boundary layer to form a vortex flow, resulting in an increase of the pressure drop resistance. And, the vortex separation of the rear body deteriorates the pressure distribution on both sides of the vertical tail when yawing, reducing the heading stability. The deflector is a special aerodynamic part that is specifically designed for the flat rear body. It can restrain the formation and development of the back vortex and weaken the low pressure area of the back body to reduce the pressure drop resistance. In the yaw state, the deflector changes the pressure distribution pattern of the tail and the back body, which can effectively increase the heading stability Sex. The drag reducing and stabilizing effect of the deflector makes the conveyor loading efficiency and aerodynamic characteristics of the flat rear body balanced.