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New approaches to determine the interface height of fire smoke based on a three‐layer zone model and its verification in large confined space
Author(s) -
Zhang Ying,
Liu Zhiyang,
Lin Yifan,
Fu Ming,
Chen Yue
Publication year - 2019
Publication title -
fire and materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.482
H-Index - 58
eISSN - 1099-1018
pISSN - 0308-0501
DOI - 10.1002/fam.2785
Subject(s) - smoke , stratification (seeds) , interface (matter) , environmental science , fire safety , simulation , meteorology , computer science , engineering , waste management , civil engineering , botany , germination , dormancy , capillary action , biology , physics , capillary number , seed dormancy
Summary Large confined space has high incidence of fires, which seriously threatens the safety of people working there. Understanding the distribution of smoke in such large space is critical to fire development prediction and smoke control. Three improved methods for the stratification interface prediction of fire smoke are developed, including of improved intra‐variance, integral ratio and N‐percentage methods. In these methods, the interface height is determined by the vertical temperature distribution based on a three‐layer smoke zone model, which is an improvement of a two‐layer zone model. Thereafter, the three improved methods are applied to several typical fire cases simulated CFD to predict the smoke interface, and their applicability and reliability are verified by comparison of the smoke stratification results with the filed simulation results. Results show that the three improved methods can effectively determine the location of the three‐layer zone model's interface, and they have the ability to predict smoke interface for fires with different fire source types and ventilation conditions.