BUILDING DOWNWASH OF PLUMES AND PLUME INTERACTIONS

This paper presents a number of wind tunnel measurements of building i nduced downwash effects on the plume in a neutrally stable boundary la yer. Vertical and horizontal profiles of mass concentrations of the ex hausts from stacks on a rectangular model building were measured downw ind of the buoyant source in the near wake. These experiments were con ducted in a simulated natural wind over open country terrain for vario us freestream wind speeds with different stack and building configurat ions. Significant downwash effects from the building below the stack w ere observed in all tested configurations. In this preliminary study, only mean concentrations were evaluated and are presented in non-dimen sional form.