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Type: Journal article
Title: A numerical investigation of flame lift-off in diesel jets
Author: Venugopal, R.
Abraham, J.
Citation: Combustion Science and Technology, 2007; 179(12):2599-2618
Publisher: Taylor & Francis Ltd
Issue Date: 2007
ISSN: 0010-2202
Statement of
Rishikesh Venugopal and John Abraham
Abstract: Flame lift-off heights are modeled in diesel jets by using diffusion flamelet extinction as a criterion for identifying the lift-off. It is shown that the axial distance in the jet where the stoichiometric scalar dissipation rate matches computed extinction scalar dissipation rate correlates with the lift-off height. The influence of injection pressures (40–138 MPa), chamber densities (14.8–58.5 kg/m³), chamber temperatures (1000–1300 K) and O₂ molar concentrations (10–21%) are studied. N-heptane is chosen as a surrogate for diesel fuel. Two chemical kinetic mechanisms, a 37-species, 56-step mechanism and a 159-species, 1540-step mechanism, are employed. Consistent with experimental findings, the computed results indicate that the flame lift-off height decreases with increase in chamber temperature, chamber density and oxygen concentration and increases when the injection velocity is increased. It is observed that across the range of chamber conditions considered, the computed extinction scalar dissipation rates correlate well with the measured lift-off heights. When chamber temperatures and O₂ concentrations are varied, the results are found to be sensitive to the choice of the chemical kinetic mechanism.
Keywords: Chemical kinetics
Diesel jets
Flame lift-off
Laminar flamelet
Rights: Copyright © Taylor & Francis Group, LLC
DOI: 10.1080/00102200701487095
Appears in Collections:Aurora harvest 4
Mechanical Engineering publications

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