Closed air outlet leakage calculation method for pressurization air supply system

According to the fluid mechanics theory, establishes the leakage calculation mathematical model and six sub-models including the static pressure difference across the closed air outlet, the frictional resistance of each duct sections, the static pressure regain etc. Taking the optimizing smoke control scheme as the physical model, sums up five type of examples according to whether taking the static pressure regain into consideration, the outlets with different air tightness grades, and the main duct with different cross-section areas. The results from a numerical calculation made by the author indicate that the additional coefficient method and the method directly based on the air tightness standard have remarkable defects; the simplified calculation method is applicable to the outlets with higher air tightness grade.