A Large-Eddy Simulation study on the effect of fuel configuration and pan distance towards chemical species for under-ventilated compartment fire scenario. (March 2022)

• Record Type: Journal Article
• Authors: Chen, Q.; Yuen, A.C.Y.; Chen, T.B.Y.; Cao, R.F.; Liu, H.; Yeoh, G.H.
• Is Part Of: International journal of heat and mass transfer. Volume 184(2022)
• Publication Date: 2022-03
• Subjects: Multiple pool fires -- Detailed chemistry -- Large eddy simulation -- Combustion modelling; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2021.122306
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Underventilated ISO9705 room fire with various fuel location configurations is studied. Detailed kinetics combustion model was coupled with a C2 H2 based soot model. Influence on CO/CO2 enclosure distribution owing to the fuel pan configurations is studied. Multiple pool fire in enclosure is characterised by considering fuel pan distance. Single stand fires and multiple pool fires under enclosure fire conditions are compared. Abstract: A set of numerical analyses was conducted to investigate the effect of fuel location of dual burners in an under-ventilated ISO9705 compartment room. Moreover, the influences of the burner separation displacement on the fire development, the evolution of thermal layers, the distribution of toxic gas species were comprehensively studied. The simulations were conducted using a novel in-house large eddy simulation (LES) based fire field model comprised of subgrid-scale (SGS) turbulence, detailed chemical kinetics of combustion, soot and radiation models. The first part of the simulation focused on 3 different fuel distributions: single centre burner (SCB), single rear burner (SRB) and two distributed burner (TDB). Alternative configurations were considered for dual burners with 4 different distances between the dual burners, to study the influence towards air flow at the doorway, internal temperature profile and major chemical species (i.e. CO/CO2 ) distributions. The numerical outcome states that fuel distribution has a minor effect on heat release rate and the total CO2 amount but noticeable differences in CO's generation and distribution. Overall, the temperature and gas field predictions were almost identical for all dual burner cases, while significant differences were observed at the rear section of the compartment, especially temperature, CO/CO2 vol fraction and soot concentration.