Abstract
The behavior of thermally generated stratified layers in a fire tunnel in the presence of ventilating-air flow is investigated experimentally. In the present work the hot combustion products are produced using burners in a high temperature wind tunnel so that measurements can be made under steady conditions. At sufficiently low ventilation velocity, a hot reverse stratified layer is formed near the ceiling and flows against the ventilation. The present paper reports measurements of the mean velocity and mean temperature distributions across the tunnel cross sections where the reverse stratified layer exists. Some probing of the plume zone is also made to understand the formation of stratified layers when a fire occurs in a ventilated tunnel. The factors that are considered are the velocity and temperature of the stratified layer, the ventilation flow velocity, and the angle of inclination of the channel. The lengths of reverse stratified layers are determined under various test conditions.
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