To improve the directional control ability of the flying-wing configuration aircraft, we design a wing tip structure which can be deflected around the direction of the wing chord based on a typical flying-wing configuration model. The static force measurement and a dynamic derivative test are conducted on the dynamic test system of the FL-14 wind tunnel. The basic aerodynamic characteristics of the flying-wing configuration aircraft and the effect of wing tip deflection on the whole aircraft are studied. The results show the static instability and extremely weak dynamic stability of the tailless flying-wing configuration aircraft in the flying direction, thereby necessitating the improvement of directional stability in both design and control of the flying-wing aircraft. The wing tip deflection is helpful to enhance the directional static and dynamic stability, and can well solve the problem of aerodynamic efficiency reduction when the traditional drag rudder is used to increase the directional stability. In addition, the wing tip deflection can also improve the deteriorated Dutch roll mode of the flying-wing configuration aircraft, bringing it closer to the conventional configuration aircraft mode that will simplify the design method of directional control law. Highly efficient with fewer rudders, the bendable wing tip is an efficient method for directional stability enhancement with high application value.
LIU Zhitao
,
JIANG Yong
,
NIE Bowen
,
CEN Fei
,
XU Sheng
. Effect of bendable wing tip on aerodynamic characteristics of flying-wing configuration aircraft[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021
, 42(6)
: 124179
-124179
.
DOI: 10.7527/S1000-6893.2020.24179
[1] 孙占久,刘龙.飞翼布局无人机气动/隐身综合性能分析[J].飞行力学,2018,36(3):15-18. SUN Z J, LIU L. Analysis on aerodynamic/stealth synthetical performance of flying wing UAV[J]. Flight Dynamics, 2018,36(3):15-18(in Chinese).
[2] ROYSDON P F, KHALID M. Lateral-directional stability investigation of a blended-wing-body:AIAA-2010-9167[R]. Reston:AIAA, 2010.
[3] ROYSDON P F, KHALID M. Blended-wing-body lateral-directional stability investigation using 6DOF simulation:AIAA-2011-1563[R]. Reston:AIAA, 2011.
[4] CHUNG J, HALLBERG E, COX S, et al. Landing pitch control analysis for a blended wing body UCAV:AIAA-2010-1035[R]. Reston:AIAA, 2010.
[5] COLGREN R, LOSCHKE R. To tail or two tails?-the effective design and modeling of yaw control devices:AIAA-2002-4609[R]. Reston:AIAA, 2002.
[6] STENFELT G, RINGERTZ U. Yaw control of a tailless aircraft configuration[J]. Journal of Aircraft, 2010, 47(5):1807-1810
[7] SIMON J, BLAKE W. Control concepts for a vertical tailless fighter:AIAA-1993-4000[R]. Reston:AIAA, 1993.
[8] 张子军,黎军. 开裂式方向舵对某无尾飞翼布局飞机气动特性影响的实验研究[J]. 实验流体力学,2010,24(3):63-66. ZHANG Z J, LI J. Experimental investigation of split-rudder deflection on aerodynamic performance of tailless flying-wing aircraft[J]. Journal of Experiments in Fluid Mechanics, 2010, 24(3):63-66(in Chinese).
[9] 马超,李林. 大展弦比飞翼布局飞机新型操纵面设计[J]. 北京航空航天大学学报,2007, 33(2):149-153. MA C, LI L. Design of innovative control surfaces of flying wing aircrafts with large ratio aspect[J]. Journal of Beijing University of Aeronautics and Astronautics, 2007, 33(2):149-153(in Chinese).
[10] BOWLUS J A,MULTHOPP D. Challenges and opportunities in tailless aircraft stability and control:AIAA-1997-3830[R]. Reston:AIAA, 1997.
[11] 张彬乾,马怡. 小展弦比飞翼布局航向控制的组合舵面研究[J]. 航空学报,2013,34(11):2435-2441. ZHANG B Q,MA Y. Investigation on combined control surfaces for the yaw control of low aspect ratio flying wing configuration[J]. Acta Aeronautica et Astronautica Sinica, 2013, 34(11):2435-2441(in Chinese).
[12] WILLIAM J G, KENNETH M D. Directional control for tailless aircraft using all moving wing tips:AIAA-1997-3487[R]. Reston:AIAA, 1997.
[13] WILLAM J G. Innovative control effectors(configuration 101) dynamic wind tunnel test report:AFRL-VA-WP-TR-1998-3043[R]. 1998.
[14] 左林玄,王晋军. 全动翼尖对无尾飞翼布局飞机气动特性影响的实验研究[J].空气动力学学报,2010,28(2):132-136. ZUO L X, WANG J J. Experimental study of the effect of AMT on aerodynamic performance of tailless flying wing aircraft[J].Acta Aerodynamica Sinica, 2010,28(2):132-136(in Chinese).
[15] 王元元,张彬乾. W型无尾布局复合式气动舵面设计研究[J]. 西北工业大学学报,2008,26(6):698-701. WANG Y Y, ZHANG B Q. Exploring combined capability of aerodynamic control surfaces of W-shaped tailless configuration[J].Journal of Northwestern Polytechnical University,2008,26(6):698-701(in Chinese).
[16] SMAILI H, BREEMAN J, LOMBAERTS T, et al. Recover:A benchmark for integrated fault tolerant flight control evaluation[M]. Berlin:Springer-Verlag Berlin Heidelberg, 2010.
CJA