Abstract
The concentration fluctuation of tracer gas emitted from an elevated point source within the atmospheric turbulent boundary layer was simulated and measured in a wind-tunnel experiment, and the concentration fluctuation of tracer gas was measured using a fast-response flame ionization detector. The effects caused by the averaging time to concentration fluctuation characteristics were analyzed in this study. The variations with the averaging time for the ratios of peak concentration to mean values showed almost similar profiles as those obtained in atmosphere. Furthermore, the relations between the skewness and flatness factors of were also observed for concentration fluctuation measured in wind tunnel.
