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An extended flamelet model for multiple injections in di Diesel engines

Felsch, C. and Gauding, M. and Hasse, C. and Vogel, S. and Peters, N. (2009):
An extended flamelet model for multiple injections in di Diesel engines.
In: Proceedings of the Combustion Institute, pp. 2775-2783, 32 II, DOI: 10.1016/j.proci.2008.05.053,
[Online-Edition: http://dx.doi.org/10.1016/j.proci.2008.05.053],
[Article]

Abstract

Combustion modeling using the Representative Interactive Flamelet (RIF) model has proven successful in predicting Diesel engine combustion. The RIF model was previously used for Diesel engine combustion processes with not more than two consecutive injections into the combustion chamber. In this study, the RIF model is extended allowing for any number of injection events. First, the two-dimensional laminar flamelet equations, which can describe the transfer of heat and mass between two-interacting mixture fields, are introduced. This is followed by a description of the various mixture fraction and mixture fraction variance equations that are required for the model extension accounting for multiple injection events. Finally, the modeling strategy for multiple injection events is derived: Different phases of combustion and interaction between the mixture fields resulting from different injections are identified. Based on this, the extension of the RIF model to describe any number of injections is put forward. Simulation results using the extended RIF model are compared against experimental data for a Common-Rail DI Diesel engine that was operated with three injection pulses. For the pilot injection and the main or post injection, respectively, different ignition phenomena are pointed out and the influence of the scalar dissipation rate on these ignition phenomena is investigated in detail. 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Item Type: Article
Erschienen: 2009
Creators: Felsch, C. and Gauding, M. and Hasse, C. and Vogel, S. and Peters, N.
Title: An extended flamelet model for multiple injections in di Diesel engines
Language: German
Abstract:

Combustion modeling using the Representative Interactive Flamelet (RIF) model has proven successful in predicting Diesel engine combustion. The RIF model was previously used for Diesel engine combustion processes with not more than two consecutive injections into the combustion chamber. In this study, the RIF model is extended allowing for any number of injection events. First, the two-dimensional laminar flamelet equations, which can describe the transfer of heat and mass between two-interacting mixture fields, are introduced. This is followed by a description of the various mixture fraction and mixture fraction variance equations that are required for the model extension accounting for multiple injection events. Finally, the modeling strategy for multiple injection events is derived: Different phases of combustion and interaction between the mixture fields resulting from different injections are identified. Based on this, the extension of the RIF model to describe any number of injections is put forward. Simulation results using the extended RIF model are compared against experimental data for a Common-Rail DI Diesel engine that was operated with three injection pulses. For the pilot injection and the main or post injection, respectively, different ignition phenomena are pointed out and the influence of the scalar dissipation rate on these ignition phenomena is investigated in detail. 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Journal or Publication Title: Proceedings of the Combustion Institute
Volume: 32 II
Uncontrolled Keywords: Combustion modeling; Common rail; DI diesel engine; Engine combustion process; Experimental data; Flamelet; Flamelet models; Injection pulse; Laminar flamelet; Mixture fraction; Model extensions; Modeling strategy; Multiple injections; Pilot injection; Post injection; Scalar dissipation rate; Simulation result; Two-dimensional flamelet; Variance equations, Combustion; Combustion chambers; Engines; Flammability; Mixtures; Smoke; Thermochemistry; Two dimensional, Diesel engines
Divisions: 16 Department of Mechanical Engineering > Simulation of reactive Thermo-Fluid Systems (STFS)
16 Department of Mechanical Engineering
Date Deposited: 23 Nov 2017 15:06
DOI: 10.1016/j.proci.2008.05.053
Official URL: http://dx.doi.org/10.1016/j.proci.2008.05.053
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