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Journal: Pozharovzryvobezopastnost/Fire and Explosion Safety (Vol.24, No. 5)

Publication Date:

Authors : ;

Page : 62-67

Keywords : ntensification degree of explosive combustion; propagation rate of flame; gas-air mixture; pressure-relief valves; flame front.;

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It is shown that in case of accidental explosions inside volumes of production area the propagation rate of flame front on a gas-air mixture (GAM) can increase due to the flame inherent phenomena of hydrodynamic instability, continuous movement of air and combustible mixture, presence of obstacles on the way of flame and bays flights in cladding structures. It is also shown that intensification of explosive combustion which appear in acceleration of flame propagation which result in increase of pressure rise rate and as a result has material effect on a choice of method of explosion protection of constructions from destruction. Equations determining the numerical values of intensification coefficients taking into account the type of GAM, number of objects on the way of flame propagation, ratio of their total area blocking free volume to the area of its cross section and distance between obstacles are given. The mathematical expressions describing process of discharge of explosion products directly into atmosphere based on law of conservation of mass, volume and energy for open system using baric and temperature dependence of normal speed of flame propagation, and also equations of gas efflux for subsonic and sonic modes are presented.

Last modified: 2019-10-17 17:05:52