| タイトル | Reattachment studies of an oscillating airfoil dynamic stall flow field |
| 著者（英） | Chandrasekhara, M. S.; Ahmed, S. |
| 著者所属（英） | NASA Ames Research Center; Naval Postgraduate School; MCAT Inst. |
| 発行日 | 1991-09-01 |
| 言語 | eng |
| 内容記述 | The reattaching flow over an oscillating airfoil executing large amplitude sinusoidal motion around a mean angle of attack of 10 degrees has been studied using the techniques of stroboscopic schlieren, two component laser Doppler velocimetry and point diffraction interferometry, for a free stream Mach number of 0.3 and a reduced frequency of 0.05. The results show that the dynamically stalled flow reattaches in a process that begins when the airfoil is very close to the static stall angle on its downward stroke and progresses over the airfoil through a large range of angles of attack as the airfoil decreases to about 6 degrees. The airfoil suction peak shows a dramatic rise as the static stall angle is approached and the velocity profiles develop such that the flow near the surface is accelerated. The process completes through the disappearance of a separation bubble that forms over the airfoil. |
| NASA分類 | AERODYNAMICS |
| レポートNO | 91A53873
AIAA PAPER 91-3225 |
| 権利 | Copyright |
