期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 35, 期 -, 页码 3061-3068出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2014.07.054
关键词
Diesel engine; Multiple-injection; Combustion vessel; Spray combustion; CONVERGE
资金
- NSF/DOE program [NSF-1258720]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1258720] Funding Source: National Science Foundation
Multiple-injection has shown significant benefits in the reduction of combustion emissions and soot formation. However, there is a need to understand the secondary flow-induced air-fuel mixture formation and subsequent combustion mechanism under multiple-injection. An experiment was performed by changing the dwell time between the pilot and main injections under the conditions of 23 kg/m(3) ambient density with 0% O-2 (non-combusting) and 15% O-2 (combusting) ambient conditions, at an injection pressure of 120 MPa. The mass ratios of pilot and main injections in the study were 15/85% and 20/80%. A hybrid shadowgraph and Mie scattering imaging technique in a nearly simultaneous mode along the same line of sight was used to visualize the spray and flame luminosity. Pilot-main spray flame properties including ignition delay, ignition location, and lift-off length were characterized from experimental images. CFD simulation of pilot-main spray combustion was performed under the same experimental conditions to provide additional insights into the combustion process. The air-fuel mixing field and ignition process followed by main injection flame structure are significantly altered at different dwells. The spray-to-flame interaction mechanism model has been established for the development of an optimal multiple-injection scheme for, possibly, low soot formation and emissions. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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