Experimental study on the radiation rate of hot smoke layer for compartment fire
The cavity refers to the space relatively closed limited the chamber refers to a confined architectural space with a relatively closed space.It aims to obtain a simple method for calculating the radiation rate of the hot smoke layer in a chamber fire,and to study the influence of lining materials on it.This article theoretically derives the radiation rate of the smoke layer as a function of variables such as the temperature and thickness of the smoke layer,the volume fraction of carbon black solid particles,and the partial pressure of carbon dioxide and water vapor,based on a dual zone chamber fire model.Through small-scale fire experiments,the influence of the main physical properties of the lining material such as emissivity and thermal inertia on the emissivity of the smoke layer was studied,and it is found that flashover occurs when the emissivity of the smoke layer rea-ches a certain threshold.The research results have practical application value for the calculation of radiation heat transfer engineering in chamber fires,and have guiding significance for predicting and suppressing the oc-currence of flashover.
compartment firetwo-zone modelradiation rate of smoke layerlining materialsurface emissivi-tythermal inertia
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