Abstract
The relationship between flutter phenomena of a flexible thin sheet on a lip of jet outlet swept by a plane air jet flow and the enhancement of jet diffusion is examined under a backward facing step. The investigation is based on an experiment where the mean velocity of the jet, the step heights and the length of the flexible thin sheet are varied. The comparison of the velocity distribution of the jet between with the fluttering flexible thin sheet and without it. As a result, it has been clarified that the jet with the fluttering flexible thin sheet enhances the jet diffusion.
