Jet-jet interaction in diesel engine combustion

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Authors

Colleges, School and Institutes

External organisations

  • Lunds Universitet

Abstract

This paper presents numerical and experimental investigation of flame lift-off and stabilization mechanisms in heavy-duty diesel engines. The injection strategy, employing different nozzle configurations, allows quantification of the impact of varying inter-jet angle spacing in the presence of swirl. For this purpose, two different inter-jet angles are chosen in this study, 45°?and 135°. Large-eddy simulations are performed, utilizing a detailed 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. 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. When the inter-jet angle decreases, this effect becomes less important.

Details

Original languageEnglish
Title of host publicationProceedings of the 8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012
Publication statusPublished - 1 Dec 2012
Event8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012 - Fukuoka, Japan
Duration: 23 Jul 201226 Jul 2012

Conference

Conference8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012
CountryJapan
CityFukuoka
Period23/07/1226/07/12

Keywords

  • Diagnostics, Diesel combustion, Modeling, Spray jet-jet interaction