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SMOKE CONCENTRATIONS INSIDE AND OUTSIDE OF CORRIDOR-LIKE ENCLOSURE FIRES

Ukleja, Sebastian, Delichatsios, Michael and Zhang, Jianping (2011) SMOKE CONCENTRATIONS INSIDE AND OUTSIDE OF CORRIDOR-LIKE ENCLOSURE FIRES. In: 7th Mediterranean Combustion Symposium, Chia Laguna, Cagliari, Sardinia, Italy. Italian Section of The Combustion Institute. 12 pp. [Conference contribution]

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URL: http://www.combustion-institute.it/proceedings/MCS-7/papers/FE/FE-23.pdf

Abstract

This work compares smoke measurements inside and outside of corridor-like enclosures for under ventilated fires to determine the smoke concentrations inside and outside the enclosure having also flames emerging outside the opening. Thirty five experiments were performed in a three metre long corridor-like compartment (of cross section 0.5 times 0.5 metres) having a gaseous burner located near the closed end. Smoke concentrations were measured in two locations inside the enclosure and also in the exhaust duct of a hood collecting the fire gases from the testing rig. In addition, the flow pattern was examined by bidirectional probes, temperature measurements and oxygen concentrations in the upper and lower layer inside the enclosure. It was found that smoke concentrations decreased in the exhaust duct after flames emerged from the opening relative to levels measured before external burning. At the same time, smoke concentrations inside increased compared to fire without flames outside. This difference in concentrations is due to the reversion of flow pattern inside the enclosure before and after the flames moved towards the opening as manifested by the bidirectional probe velocity and oxygen concentrations measurements. Namely, the flow pattern changed behind the travelling flame front, i.e. hot gases in the upper layer were travelling backwards towards the closed end of the corridor thus contributing to smoke accumulation inside the enclosure whereas they were travelling the opposite way ahead of the flame front.

Item Type:Conference contribution (Paper)
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Built Environment Research Institute > Fire Safety and Engineering Research and Technology Centre (FireSERT)
ID Code:25293
Deposited By: Dr Sebastian Ukleja
Deposited On:19 Mar 2013 11:07
Last Modified:19 Mar 2013 11:07

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