摘要
给出 8 0°三角翼和Λ机翼模型低速三维非定常流场显示和测量结果 ,包括大迎角和大滚转角时前缘涡跳动频率及相应模型的抖动频率测量 ,模型作大幅度振动时流动图象的相位平均测量 ,以及由平行 6片光经三维重建得到空间流动图象。测量结果表明 ,获得了在大迎角下模型抖动是由前缘涡的非定常跳动引起的这一新的流动机理。作为一种新的测量技术和新概念 ,模型大幅度振动时流动图象的相位平均测量 ,提供了研究非定常涡特性和定量确定涡核位置的有效手段。类似核磁共振 (MRI)图象处理 ,由平行 6片光流动显示经三维重建得到空间图象 ,对于分析涡的破碎、绕合。
The measurements and flow visualization results of an 80° delta-wing and Λ-wing are reported. They contain measurements of vortex spring frequency and model vibration frequency, phase-averaged flow image and reconstructed 3-D flow visualization from 6 parallel laser sheet image. The measurements show that a new flow mechanism has been obtained, i.e. model vibration at high angle of attack may be induced by unsteady vortex spring. The measured vortex spring frequency and model vibration frequency are 7.75 Hz and 7.2 Hz respectively under the same test condition. As a new measurement technology and a new concept, phase-averaged flow image at model large amplitude motion offers an ability more accurate to measure position of the vortex over the model. The vortex position from phase-averaged image is as distinct from the time-averaged vortex position. From the multi-laser-sheet image reconstructed 3-D visualization a global domain vortex roll-up or break-down property would be able to investigate.
出处
《空气动力学学报》
EI
CSCD
北大核心
2005年第1期118-122,67,共6页
Acta Aerodynamica Sinica
基金
武器装备预研基金项目 (51 4 1 30 4 0 70 1HK81 0 1 )
关键词
非定常流场
大迎角
前缘涡
机翼
动频
滚转角
流动显示
类似
平均
三维
Flow visualization
Frequencies
Image processing
Measurements
Rolls (machine components)
Three dimensional
Vibrations (mechanical)
Vortex flow
Wings
