Modeling of aluminum particle combustion with emphasis on the oxide effects and variable transport properties |
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Authors: | Heesung Yang Woongsup Yoon |
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Affiliation: | 1.School of Mechanical Engineering,Yonsei University,Seoul,Korea |
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Abstract: | A simplified analytical modeling of single aluminum particle combustion was conducted. Ignition and quasi-steady combustion
(QSC) were separately formulated and integrated. Both the heat transfer from the hot ambient gas and the enthalpy of heterogeneous
surface reaction (HSR) served to cause the particle ignition. Conservation equations were solved for QSC parameters in conjunction
with conserved scalar formulation and Shvab-Zeldovich function. Limit temperature postulate was formulated by a sink term
pertinent to the dissociation of the aluminum oxide near the flame zone. Effective latent heat of vaporization was modified
for the thermal radiation. Ignition and QSC of the aluminum particle were predicted and discussed with emphasis on the effect
of the aluminum oxide and variable properties. The model was validated with the experiments regarding ignition delay time,
burning rate, residue particle size, flame temperature, QSC duration, and stand-off distance of the envelop flame. Agreement
was satisfactory and the prediction errors were limited within 10%. |
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Keywords: | |
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