Project Title: The effects of multi-parameter coupled on the flame spread over the surface of representative solid combustibles

Principal Investigator: Prof. Sun Jinhua

Funding Source: National Natural Science Foundation of China

Project Period: 2010-2012

Abstract:

In order to investigate the effects of multi-parameter coupled (oxygen concentration, radiant heat flux, flow velocity) on flame spread over the surface of representative solid combustibles, a series of experiments will be carried out in the plane and plateau (Tibet) respectively by combining and varying these ambient parameters regularly. The high speed camera, the Schlieren image system and the particle tracking technology, as well as the ionization probes, micro-fine thermocouples and the smoke analysis technology are used to study the variation of the fine structure of the gaseous flame, the internal pyrolysis zone structure of the solid, the species of smoke and the heat release rate, and also the critical condition of the catastrophes, such as the flashover and extinguishment. Synchrotron radiation vacuum ultraviolet photoionization and molecular beam mass spectrometry are also used to explore the pyrolysis products, the reaction intermediate and the mechanism of the solid combustible pyrolysis at various pressure and oxygen concentrations. Furthermore, combined with the experimental results and the basic theories of chemical reaction kinetics, combustion, heat and mass transfer, the effect law of multi-parameter coupled on flame spread over solid combustible surface and the heat transfer regime are analyzed, the mathematical and physical models coupled with oxygen concentration and heat radiation of the flame spread over solid combustible surface are built, and also the commonness and essential difference between flame spread behaviours in the plateau and plane are revealed