Journal article
Lift-off and stabilization of n-heptane combustion in a diesel engine with a multiple-nozzle injection
Proceedings of the Combustion Institute, Vol.34(2), pp.3031-3038
2013
Abstract
This paper presents a joint numerical and experimental investigation of flame lift-off and stabilization mechanisms in heavy-duty diesel engines. The injection strategy, employing different nozzle configurations, allows for quantification of the impact of varying inter-jet angle spacing in the presence of swirl. For this purpose, three different inter-jet angles are chosen in this study; 45°, 90° and 135°. Large-eddy simulations are performed utilizing a detailed chemical kinetic mechanism for n-heptane to resolve the turbulent fuel and air mixing and to capture the important species surrounding the ignition and flame-fronts to describe the flame stabilization process. Measurements are carried out for OH chemiluminescence to identify the flame lift-off position in an optical accessible engine. In general, the swirl flow in the ambient air shows a great impact on the lift-off, with a 15% difference in the lift-off lengths on the upwind and downwind side of the jet. The LES results show that important ignition reactions undergo in a broad region in front of the lift-off position. With decreasing inter-jet angle, it is shown that the impact of transportation of hot products from adjacent jets becomes more prominent. Hot reservoirs surrounding the lift-off length increase the local ambient temperature and augment the auto-ignition process by mixing of the cold injected fuel and hot air.
Details
- Title
- Lift-off and stabilization of n-heptane combustion in a diesel engine with a multiple-nozzle injection
- Authors/Creators
- R. Solsjö (Author/Creator) - Lund UniversityM. Jangi (Author/Creator) - Lund UniversityC. Chartier (Author/Creator) - Lund UniversityÖ. Andersson (Author/Creator) - Lund UniversityX-S Bai (Author/Creator) - Lund University
- Publication Details
- Proceedings of the Combustion Institute, Vol.34(2), pp.3031-3038
- Publisher
- Elsevier Limited
- Identifiers
- 991005540527307891
- Copyright
- © 2012 The Combustion Institute
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 7 Engineering & Materials Science
- 7.177 Combustion
- 7.177.261 Biodiesel Combustion
- Web Of Science research areas
- Energy & Fuels
- Engineering, Chemical
- Engineering, Mechanical
- Thermodynamics
- ESI research areas
- Engineering