Transient Analysis of Fire-Induced Heat Transfer in Cylindrical Sealed Space
The main objective of the present work is an investigation of the heat transfer induced by the fire in a cylindrical sealed space. The thermal smoke flow geometry characteristics in cylindrical sealed space were discussed, LES and mixture fraction methods were applied to conduct numerical transient analysis. Computed results has validated the smoke flow course in simulation experiments. The study indicates that the heat transfer faster upper the fire source than around it. When the fire source location is near the wall, the smoke layer distributing were not distinct far from the fire source, and the heat transfer faster in transverse than longitudinal direction. Keywords—heat transfer , fire, cylindrical sealed space, numerical simulation.
Luminous heights of turbulent diffusion flames
A general analytical relation for predicting mean luminous heights of buoyancy-controlled, turbulent diffusion flames is established. The relationship is based on a plot of experimental flame heights in correlation coordinates proposed previously, including extensive data recently published.
Effects of vitiated air on radiation and completeness of combustion in propane pool fires
The effects of vitiated supply air on the heat release rate, products yield and radiation in turbulent pool fires were measured in an enclosure under well controlled conditions. A propane sintered-metal gas burner, 380 mm in diameter, produced the pool fire. Vitiation of the supply air was implemented by diluting with ambient air the exhaust gases from one or two propane furnaces. Direct measurements of the rates of production of major species as well as flame radiation were made as a function of height from the pool surface through a technique reported [1] previously. The total heat release rate for the propane pool fire varied in the present experiments from 30 kW to 50 kW and the vitiation of the supply air expressed in terms of oxygen concentration from 17.5% (by volume) to ambient air conditions. The collection hood significantly influenced the fire when it was near the pool base. However, at greater separations the data is independent of the apparatus and shows that vitiation significantly reduces the radiative fraction of the heat release but does not significantly affect the overall chemical heat release or CO production rate.