Flying-wing aircraft is an important configuration for modern aircraft design. Due to the lack of traditional control surfaces such as horizontal tails and vertical tails, the flying-wing aircraft may encounter a serious of dynamic problems at high angles of attack, such as roll instability, coupled pitch-roll instability, and coupled yaw-roll instability, affecting the aerodynamic performance and flight safety. To address this issue, this study of synthetic jet active flow control is conducted. The control strategy of enhancing leading-edge vortex to improve stability is proposed. The effect of the synthetic jet on the control law of the roll motion and its coupled motion is analyzed, and the flow control mechanism of the synthetic jet under dynamic motion and the coupled effect revealed. It is indicated that the synthetic jet positioned at the leading edge of the flying-wing aircraft can effectively enhance the leading-edge vortex, thereby changing the aerodynamic force and moment. A control strategy is proposed to ensure that the control moment vector is always opposite to the angular velocity of the roll motion, which can increase the roll damping, thereby improving the lateral stability. The present results can provide an important technical support for the stabilization control of the flying-wing aircraft.
FENG Lihao
,
WEI Lingyun
,
DONG Lei
,
WANG Jinjun
. Active flow control for coupled motion instability of flying-wing aircraft[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022
, 43(10)
: 527353
-527353
.
DOI: 10.7527/S1000-6893.2022.27353
[1] ROYSDON P, KHALID M. Blended-wing-body lateral-directional stability investigation using 6DOF simu-lation[J]. Proceedings of the Institution of Mechanical Engineers, Part G:Journal of Aerospace Engineering, 2014, 228(1):7-19.
[2] DMITRIEV V G, SHKADOV L M, DENISOV V E, et al. The flying-wing concept-chances and risks:AIAA-2003-2887[R]. Reston:AIAA, 2003.
[3] STENFELT G, RINGERTZ U. Yaw control of a tailless aircraft configuration[J]. Journal of Aircraft, 2010, 47(5):1807-1811.
[4] NGUYEN L, YIP L, CHAMBERS J. Self-induced wing rock of slender delta wings[C]//7th Atmospheric Flight Mechanics Conference. Reston:AIAA, 1981.
[5] LEVIN D, KATZ J. Dynamic load measurements with delta wings undergoing self-induced roll oscillations[J]. Journal of Aircraft, 1984, 21(1):30-36.
[6] NG T T, MALCOLM G N, LEWIS L C. Experimental study of vortex flows over delta wings in wing-rock motion[J]. Journal of Aircraft, 1992, 29(4):598-603.
[7] GRESHAM N T, WANG Z, GURSUL I. Vortex dynamics of free-to-roll slender and nonslender delta wings[J]. Journal of Aircraft, 2010, 47(1):292-302.
[8] ERICSSON L E. The fluid mechanics of slender wing rock[J]. Journal of Aircraft, 1984, 21(5):322-328.
[9] NELSON R C, PELLETIER A. The unsteady aerodynamics of slender wings and aircraft undergoing large amplitude maneuvers[J]. Progress in Aerospace Sciences, 2003, 39(2-3):185-248.
[10] HUANG D, WU G X. Unsteady rolling moment characteristics for a fighter oscillating with yawing-rolling coupled motion[J]. Journal of Aircraft, 2006, 43(5):1570-1573.
[11] AHMED A, WORLEY J. Yaw-roll coupled oscillations of a slender delta wing[C]//46th AIAA Aerospace Sciences Meeting and Exhibit. Reston:AIAA, 2008.
[12] 杨小亮, 刘伟, 赵云飞, 等. 80°后掠三角翼强迫俯仰、自由滚转双自由度耦合运动特性数值研究[J]. 空气动力学学报, 2011, 29(4):421-426. YANG X L, LIU W, ZHAO Y F, et al. Numerical investigation of the characteristics of double degree-of-freedom motion of an 80° delta wing in force-pitch and free-roll[J]. Acta Aerodynamica Sinica, 2011, 29(4):421-426 (in Chinese).
[13] OWENS B, CAPONE F, HALL R, et al. Free-to-roll analysis of abrupt wing stall on military aircraft at transonic speeds[C]//41 st Aerospace Sciences Meeting and Exhibit. Reston:AIAA, 2003.
[14] OWENS D B, CAPONE F J, HALL R M, et al. Transonic free-to-roll analysis of abrupt wing stall on military aircraft[J]. Journal of Aircraft, 2004, 41(3):474-484.
[15] KHAN M J, AHMED A, OEHL D C. Response of a free-to-roll slender delta wings to pitching and plunging[J]. Journal of Aircraft, 2006, 43(1):275-279.
[16] KANDIL O, MENZIES M. Coupled rolling and pitching oscillation effects on transonic shock-induced vortex-breakdown flow of a delta wing[C]//34th Aerospace Sciences Meeting and Exhibit. Reston:AIAA, 1996.
[17] WANG J J, FENG L H. Flow control techniques and applications[M]. Cambridge:Cambridge University Press, 2018.
[18] NIU Z G, LIU J, LIANG H, et al. Flying wing flow separation control by microsecond pulsed dielectric barrier discharge at high Reynolds number[J]. AIP Advances, 2019, 9(12):125120.
[19] ZHU J C, SHI Z W, SUN Q B, et al. Yaw control of a flying-wing unmanned aerial vehicle based on reverse jet control[J]. Proceedings of the Institution of Mechanical Engineers, Part G:Journal of Aerospace Engineering, 2020, 234(6):1237-1255.
[20] DONG Y Z, SHI Z W, CHEN K, et al. The suppression of flying-wing roll oscillations with open and closed-loop spanwise blowing[J]. Aerospace Science and Technology, 2020, 99:105766.
[21] CROWTHER W J, WILDE P I A, GILL K, et al. Towards Integrated design of fluidic flight controls for a flapless aircraft[J]. The Aeronautical Journal, 2009, 113(1149):699-713.
[22] LATEN J B, LEBEAU R P. Development and flight testing of a dielectric barrier discharge plasma actuator controlled aircraft[C]//AIAA Scitech 2019 Forum. Reston:AIAA, 2019.
[23] ZHANG P F, WANG J J, FENG L H. Review of zero-net-mass-flux jet and its application in separation flow control[J]. Science in China Series E:Technological Sciences, 2008, 51(9):1315-1344.
[24] 白雪礼. 小展弦比飞翼布局飞行器非定常气动特性研究[D]. 南京:南京航空航天大学, 2020. BAI X L. Research on unsteady aerodynamic characteristics of low aspect ratio flying wing[D]. Nanjing:Nanjing University of Aeronautics and Astronautics, 2020 (in Chinese).
[25] LI X, FENG L H, LI Z Y. Flow mechanism for the effect of pivot point on the aerodynamic characteristics of a pitching airfoil and its manipulation[J]. Physics of Fluids, 2019, 31(8):087108.
[26] NARSIPUR S, HOSANGADI P, GOPALARATHNAM A, et al. Variation of leading-edge suction at stall for steady and unsteady airfoil motions[C]//54th AIAA Aerospace Sciences Meeting. Reston:AIAA, 2016.
[27] LI X, FENG L H. Critical indicators of dynamic stall vortex[J]. Journal of Fluid Mechanics, 2022, 937:A16.
[28] 黄达, 李志强, 史志伟, 等. 飞机大振幅非定常滚转运动的非线性稳定性分析[J]. 空气动力学学报, 2000, 18(4):401-406. HUANG D, LI Z Q, SHI Z W, et al. A nonlinear stability analysis for an aircraft rolling in large amplitude motion[J]. Acta Aerodynamica Sinica, 2000, 18(4):401-406 (in Chinese).
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