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Wall fire close to an horizontal surface: Numerical modelling and experimental validation
Author(s) -
Annarumma Marcelo,
Audouin Laurent,
Most JeanMichel,
Joulain Pierre
Publication year - 1992
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.810160102
Subject(s) - combustor , thermocouple , mechanics , turbulence , gas burner , flow (mathematics) , scale (ratio) , velocimetry , materials science , meteorology , combustion , physics , chemistry , composite material , organic chemistry , quantum mechanics
Abstract In order to contribute to a better understanding of natural fire configurations, three different experimental arrangements were considered. They simulated, at laboratory scale, three simple room fire situations. 1–3 First, we tested a gas‐fueled porous burner simulating a wall fire. Then an insulated floor was placed close to it. Finally the wall and the floor burnt simultaneously. Velocity and turbulence measurements were performed using a two‐component laser‐doppler velocimetry (LDV) system operating in the forward‐scatter mode. Mean gas temperatures were obtained with a 200 μm butt‐welded chromel‐alumel thermocouple, located 2 mm downstream of the velocity measurement control volume. Simultaneous measurements of two velocity components proved to be very useful, especially in the characterization of the flame structure and of the entertainment process. A simple field model describing strongly buoyant diffusion flames is proposed in search of computational economy and a basic understanding of the phenomena involved. Our aim is to analyse the suitability of such a simple model for the description of the mean properties of the flow. This work showed the interaction between the burning wall, the floor and the pool fire, and especially the role played by the large‐scale structures characteristic of entertainment and mixing processes in free fires.