Experimental Studies on Leading-Edge Vortex Breakdown and Control of Flow over 76°/40° Double Delta Wing
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摘要: 流动显示结果表明,喷流能有效地推迟双三角翼前缘涡的破裂,且随着攻角的增大,前缘涡破裂位置逐渐推后,喷流极大地改善了大攻角情况下前缘涡的非对称破裂特性,能有效地克服可能出现的机翼的"摇滚"现象.另外,后缘喷流可以减弱乃至消除前缘涡混掺现象的发生,进而有利于飞行器的操纵.Abstract: The flow visualization techniques has been used to investigate the effects of trailing-edge jets on the leading-edge vortex breakdown and its control of flow over a 76°/40° double Delta wing. The experimental results indicate that the trailing-edge jets can delay the leading-edge vortex breakdown efficiently, and this delay increases with the angle of attack. The trailing-edge jets can greatly improve the asymmetrical characteristics of the leading-edge vortex breakdown at large angle of attack, and the possible occurrence of "rock" phenomenon may be overcome. In addition, the trailing-edge jets may weaken or even eliminate the mixing phenomenon of the leading-edge vortex, which is in advantage of the flight control of aircraft.
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Key words:
- vortex flow /
- flow visualization /
- jet tests /
- flow over a double Delta wing /
- flow control
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[1] Visser K, Iwanski K, Nelson R,et al. Control of leading edge vortex breakdown by blowing. AIAA Paper 88-0504,1988. [2] Magness C, Robinson O, Rockwell D. Control of leading edge vortices on a delta wing. AIAA Paper 89-0999,1989. [3] Roos F W, Kegelman J T.Recent explorations of leading edge vortex flowfields. NASA CP3149,1990.157~172. [4] Helin H E,Watry C W.Effects of trailing-edge jet entrainment on delta wing vortices[J]. AIAA Journal,1994,32(4):802~804. [5] Nawrocki D.Differential and vectored trailing edge jet control of delta wing vortices. AIAA Paper 95-0008,1995. [6] 王晋军,苗福友,钮珍南,等.后缘喷流对三角翼前缘涡的影响[J]. 空气动力学学报,2000,18(2):125~131. [7] 王晋军,刘激瀛,薛启智.矢量喷流对65°三角翼前缘涡破裂的影响[J]. 流体力学测量与控制,2000,14(3):61~65. [8] 刘激瀛,王晋军,薛启智.60°三角翼前缘涡破裂及其控制实验研究[J]. 实验力学,2000,15(2):206~210. -
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