Research on the Influence of Environmental Wind on Natural Smoke Exhaust During Building Fire

Environmental wind is one of the main driving forces which discharge fire smoke outside the buildings that adopt the method of natural smoke exhaust. The additional pressure difference caused by environmental wind on the buildings' surface was analyzed and the total additional pressure coefficient was proposed as control parameter in order to evaluate the efficiency of environmental wind on natural smoke exhaust. In the instance-a theatre-by CFD, a software used for the numerical simulation research on the course of natural smoke exhaust, the effects of the environmental wind on natural smoke exhaust in different combinations of vents and the main reasons of bidirectional flow in the smoke vent openings were studied. It can be referred for designing of natural smoke exhaust system.