关键词: 前掠翼, 融合体无尾布局, 两段可动式侧板, 风洞试验, 流动控制

Abstract:

This article investigates the flow control technique of forward-swept wing blended body (FBB) tailless configuration by means of wind tunnel tests. The results show that the FBB tailless configuration can make the leading edge vortex and high swept side-strake body vortex work well together, so that wing-root separation can be controlled. Thus, the FBB configuration acquires excellent longitudinal aerodynamic characteristics. The two-part moving strake (TMS) technique is introduced to solve the separating problem of a forward-swept wing at a high angle of attack. TMS works using a slot formed by its moving part and fixed part. The slot leads the high speed flow from a lower surface to an upper surface to enhance the side-strake body vortex, and in this way separation at the wing-root can be controlled. At the same time, TMS can limit the separating area at the head of a plane. In conclusion, TMS improves the pitching characteristics without causing lift decrease. This leads to great amelioration of the aerodynamic performance of a plane after stalling and improves the longitudinal equilibrium and pitching control of FBB tailless configuration. The conclusion of this article may serve as reference for studying the control of other tailless configurations.

Key words: forward-swept wing, blended body tailless configuration, two-part movingstrake, wind tunnel test, flow control