Spread and burning behavior of continuous spill fires
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چکیده
General rights Copyright for the publications made accessible via the Edinburgh Research Explorer is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Take down policy The University of Edinburgh has made every reasonable effort to ensure that Edinburgh Research Explorer content complies with UK legislation. If you believe that the public display of this file breaches copyright please contact [email protected] providing details, and we will remove access to the work immediately and investigate your claim. ABSTRACT Spill fire experiments with continuous discharge on a fireproof glass sheet were conducted to improve the understanding of spill fire spread and burning. Ethanol was used as the fuel and the discharge rate was varied from 2.8 mL/s to 7.6 mL/s. Three ignition conditions were used in the experiments; no ignition, instantaneous ignition and delayed ignition. The spread rate, regression rate, penetrated thermal radiation and the temperature of the bottom glass were analyzed. The experiments clearly show the entire spread process for spill fires. Further, the regression rate of spill fires at the quasi-steady burning was lower than that of pool fires and the ratio of the spill fires' regression rate to the pool fires' regression rate was found to be approximately 0.89. With respect to the radiative penetration and the heat conduction between the fuel layer and the glass, a regression rate expression for spill fires was developed based on some modifications on existing expressions for pool fires. In addition, a complete phenomenological model for spill fires was developed by combining the characteristics of spread and burning. The model was verified by the experimental data and found to predict the spread process for spill fires with reasonable accuracy. NOMENCLATURE LISTING ∆He heat of gasification (kJ/g) w∞ a peak regression rate (m/s) Qdis fuel discharge rate (cm 3 /s) ws steady regression rate (m/s) R spread radius (cm) qf heat feedback (kW/m 2) Rmax maximum spread radius (cm) qcov convective heat feedback (kW/m 2) Sst steady burning area (cm 2) qpe penetrated thermal radiation (kW/m 2) T fuel temperature qout heat loss of fuel layer (kW/m 2) Ta ambient temperature (K) h fuel thickness (mm) Tb fuel boiling point (K) hmin minimum fuel thickness (mm) Ys smoke yield g gravitational acceleration (m/s 2) cp fuel specific heat (kJ/(gK)) k spread …
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