Computational Investigation on Belly-flap for Aerofoil Pitch Control at High Subsonic
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摘要: 采用CFD方法探讨了腹部扰流板用于无尾布局俯仰控制的可行性。选择无尾布局机体中部翼型作为研究对象,在高速飞行状态,研究了扰流板位置、高度、偏度等参数对翼型俯仰和升阻性能的影响及其流动机理。结果表明:腹部扰流板产生的泡状分离及其影响通过改变翼型压力分布和激波位置,产生板前加载、板后卸载效果。通过对扰流板几何参数的合理选择,可在较大迎角范围内提供用于俯仰控制的抬头力矩增量,可作为改善无尾布局高速俯仰操纵特性措施深入研究。扰流板带来的附加阻力增量使翼型升阻性能变差问题,需在后续研究中进一步考察。Abstract: The feasibility of Belly-flap being developed as a pitch control device for tailless configuration at high subsonic is investigated on a BWB in-body airfoil,using CFD method.The size,location and deflection angle of the flap are studied to detect their effects on the aerodynamic characteristics.The results show that the bubble separation due to the belly-flap can change pressure distribution and shock position on the airfoil.In this way,the load distribution can be improved to bring the pitch-up moment in a wide angle of attack.The optimized geometry parameters of Belly-flap can be applied to tailless configuration design and to improve its lift-drag performance in this paper.
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Key words:
- airfoils /
- pitch control /
- belly-flap /
- tailless configuration aircraft /
- transonic flow /
- shock waves /
- pres-sure distribution
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