Author(s)

P. Broas

Abstract

Wind tunnel investigation of waste air re-entry with wall ventilation P. Broas Technical Research Centre of Finland, Ship Laboratory, Tekniikantie 12, SF-02150, Espoo, Finland ABSTRACT A wind tunnel investigation was carried out using tracer gas measurements with a 1:150 scale-model to determine how much waste air from a wall outlet is carried into the intakes in the same wall. The results were compared with full-scale experiments and with theories used with roof ventilators. These showed that if the ratio of the exhaust jet velocity to windspeed is kept constant, the dilution does not change even though the absolute velocities of the exhaust jet and wind tunnel flow are varied. Instead the ratio itself has an effect on the dilution, but this is not very clearly seen because of the turbulence of the surrounding wind field. Owing to the vortex flow and the wake of the building, the trajectories of exhaust jet plumes are much more complicated with wall ventilators than with roof venti

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