Flame extension length beneath a horizontal eave in fire-induced thermal plume ejected from a compartment

•Ejected thermal plume behavior from a compartment for different eaves height studied.•Flame extension length beneath the horizontal eave acquired.•Dimensionless flame extension length model proposed.•The results are of benefit to the building fire protections. This work focuses on the flame extensi...

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Bibliographic Details
Published in:Applied thermal engineering 2017-12, Vol.127, p.729-735
Main Authors: Lu, K.H., Mao, S.H., Wang, J., Hu, L.H.
Format: Article
Language:English
Subjects:
Building facades
CCD cameras
Compartment
Computer simulation
Ejection
Enthalpy
Fire protection
Flame extension length
Heat release rate
Heat transfer
Horizontal eave
Studies
Thermal plume
Window
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Summary:•Ejected thermal plume behavior from a compartment for different eaves height studied.•Flame extension length beneath the horizontal eave acquired.•Dimensionless flame extension length model proposed.•The results are of benefit to the building fire protections. This work focuses on the flame extension length beneath a horizontal eave in fire-induced thermal plume ejected from a compartment window. Series of small scale experiments are conducted in a cubic compartment of 0.4m with a facade wall and a variable window. A noncombustible board is installed horizontally attached to the facade wall to simulate the eave upon building facade. The window dimensions, the vertical distance of horizontal eave to the window top and the total heat release rate are altered in our experiments. Two CCD cameras are employed to record the ejected flame videos from both front and lateral directions. Results show that the flame extension behavior appears when the horizontal eave level is lower than the corresponding free facade flame tip. The flame extends almost symmetrically, becoming longer for a higher excess heat release rate, but turning shorter when the horizontal eave is moved up. A dimensionless model in relation to the free visible flame height, the excess heat release rate and the vertical height of horizontal eave is well developed based on experimental observations. The findings would provide an important basis in the practically applications of horizontal eaves for better building fire protections.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2017.07.175