Abstract
This study investigated the effect of turbulence properties of main flow on turbulent diffusion phenomena. Turbulence including longitudinal vortices was generated by several turbulence generators and was stretched by a contraction unit of a wind tunnel. CO_2 gas was injected continuously from a point source into main flow controlled turbulence properties by several turbulence generators, and then the concentration of CO_2 was measured in the downstream region. As a result, it was found that the diffusion coefficient is increased by not only turbulence intensity but stretched turbulence. Finally, it was found the effect of several turbulence properties on turbulent diffusion phenomena.
