Unsteady Flow Behaviour of a Slender Delta Wing Rock

The flow visualization of vortex behaviour for the two conditions of static and dynamic during wing rock motion was conducted and photograph records were taken for a slender delta wing in a various roll angle at α=30 ° and 40°.Results indicated that the vortex behaviour was quite different at the same roll angle between static and dynamic conditions.The time lag effects of vortex behaviour during wing rock comparing with static condition was observed.The time lag of vertical positions of vortices was apparent during wing rock motion,whereas the time lag was not significant for spanwise positions of vortices.The effect of starting angle of wing rock on the vortex behaviour was considerable.