Numerical Simulation of Diesel Spray Evaporation in a “Stabilized Cool Flame” Reactor: A Comparative Study |
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Authors: | Dionysios I Kolaitis Maria A Founti |
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Affiliation: | (1) Heterogeneous Mixtures and Combustion Systems, Thermal Engineering Section, School of Mechanical Engineering, National Technical University of Athens, 9, Heroon Polytechniou St., Polytechnioupoli Zografou, 15780 Athens, Greece |
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Abstract: | The major objective of this work is to numerically investigate the interacting physical and chemical phenomena that characterize
the flow in a stabilized cool flame diesel fuel spray evaporation system. A two-phase RANS computational fluid dynamics code
has been developed and used to predict the characteristics of the developing turbulent, multiphase, multi-component, reactive
flow-field. The code employs a Eulerian–Lagrangian approach, taking into account the mass, momentum, thermal and turbulent
energy exchange between the phases. A variety of physical phenomena, such as turbulent dispersion, droplet evaporation, droplet-wall
collision, conjugate heat transfer, drift correction, two-way coupling are taken into account by implementing respective sub-models.
Two alternative modelling approaches for the simulation of cool flame reactions have been validated and evaluated by comparing
numerical predictions with experimental data from two atmospheric pressure, evaporating Diesel spray, Stabilized Cool Flame
reactors. Both models have achieved good quantitative agreement in the majority of the considered test cases. The results
have been used to estimate the local physical and chemical characteristic time scales of the occurring phenomena, thus allowing,
for the first time, the classification of stabilized cool flames. |
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Keywords: | Two-phase CFD Cool flames Droplet evaporation Low-temperature oxidation |
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