An experimental study of the dispersion of short duration emissions in a turbulent boundary layer

摘要

This paper describes a wind tunnel study of the behaviour of short duration emissions from a ground level source into a deep turbulent boundary layer. Ensemble averaged properties of the resulting clouds are compared with the redictions of similarity theory and the characteristic profile shapes of the alongwind, lateral and vertical mean concentration distributions are determined. Criteria for puff-like and plume-like behaviour are derived. The dependence of concentration fluctuations on position within a cloud, emission duration and time of travel is investigated.