Trim induced drag analysis and optimization of elastic twin-tailboom aircraft
-
摘要: 基于能量方法推导了弹性飞机静气弹配平方程,提出了用定常涡格法结合Trefftz平面理论与阻力计算经验公式来求解弹性飞机定直平飞配平状态诱导阻力与配平阻力的分析思路,建立了通过机翼几何扭转角优化配置减小全机诱导阻力的分析方法.以某双尾撑无人机为例进行研究,分析发现尾撑纵向弯曲刚度对该布局飞机的全机诱导阻力、升降舵配平舵偏型阻及全机阻力等参数有重要影响.优化分析结果表明:通过机翼扭转角的合理优化,可使全机展向升力分布形式更接近于椭圆分布,进而有效减小全机诱导阻力,且对其他阻力分量也有一定的减缓效果.Abstract: Based on the energy method, the trim equations of flexible aircraft considering static aeroelasticity are derived. The idea of using static vortex lattice method combined with Trefftz plane theory and empirical formula to solve the induced drag and trim drag of flexible aircraft in trimmed level flight was proposed. The method of reducing total induced drag through optimization of the wing geometric twist angle was introduced. An UAV with twin tailbooms was analyzed. The result shows that the longitudinal bending stiffness has large effects on the total induced drag of the aircraft in such configuration, and it also affects the profile drag of the elevator deflexion and the total drag of the aircraft remarkably. Results of the optimization indicate that appropriate optimization of the geometric twist can make the whole span-wise lift distribution more close to the ellipse one, which will reduce the total induced drag effectively and other drag components positively.
-
Key words:
- aeroelasticity /
- twin-tailboom /
- trim drag /
- induced drag /
- tailboom stiffness /
- geometric twist
-
[1] Phillips W F.Lifting-line analysis for twisted wings and washout-optimized wings[J].Journal of aircraft,2004,41(1):128-136 [2] Cusher A A,Gopalarathnam A.Drag reduction methodology for adaptive tailless aircraft.AIAA 2006-3320,2006 [3] 陈磊,吴志刚,杨超,等.减小弹性机翼诱导阻力的多控制面优化研究[J].工程力学,2009,26(10):191-196
Chen Lei,Wu Zhigang,Yang Chao,et al.Induced drag reduction optimization study using multi-control surfaces for elastic wing[J].Engineering Mechanics,2009,26(10):191-196 (in Chinese)[4] Pfeiffer N J.Numerical winglet optimization.AIAA 2004-0213,2004 [5] Kusmina S,Ishmuratov F,Kuzmin V.Minimization of induced drag of elastic airplane.AIAA 2004-4611,2004 [6] Roskam J.Airplane flight dynamics and automatic flight controls [M].Lawrence:DAR Corporation,2001:3-4 [7] Waszak M R,Schmidt D K.On the flight dynamics of aeroelastic vehicles.AIAA 1986-2077,1986 [8] Meirovitch L.Fundamentals of vibrations[M].New York:McGraw-Hill,2001:268-275 [9] Joseph Katz,Allen Plotkin.Low-speed aerodynamics[M].2nd ed.Cambridge:Cambridge University Press,2001:201-204 [10] 《飞机设计手册》总编委会.飞机设计手册第6册:气动设计[M].北京:航空工业出版社,2005:252-325
Editorial board of aircraft design handbook.Aircraft design handbook vol 6:aerodynamic design[M].Beijing:Aviation Industry Press,2005:252-325 (in Chinese)[11] 陈宝林.最优化理论与算法[M].2版.北京:清华大学出版社,2005:417-422
Chen Baolin.Theory and arithmetic of optimization[M].2nd ed.Beijing:Tsinghua University Press:417-422 (in Chinese)[12] 肖志鹏,万志强,梁猛,等.双尾撑布局飞机飞行载荷分析[J].北京航空航天大学学报,2008,34(4):456-459
Xiao Zhipeng,Wan Zhiqiang,Liang Meng,et al.Flight loads analysis of a twin-tailboom aircraft[J].Journal of Beijing University of Aeronautics and Astronautics,2008,34(4):456-459 (in Chinese) -
点击查看大图
计量
- 文章访问数: 3198
- HTML全文浏览量: 175
- PDF下载量: 828
- 被引次数: 0
下载:
