Spray-combustion interaction mechanism of multiple-injection under diesel engine conditions
Document Type
Article
Publication Date
1-1-2015
Abstract
© 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved. 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/m3 ambient density with 0% O2 (non-combusting) and 15% O2 (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.
Publication Title
Proceedings of the Combustion Institute
Recommended Citation
Cung, K.,
Moiz, A.,
Johnson, J.,
Lee, S.,
Kweon, C.,
&
Montanaro, A.
(2015).
Spray-combustion interaction mechanism of multiple-injection under diesel engine conditions.
Proceedings of the Combustion Institute,
35(3), 3061-3068.
http://doi.org/10.1016/j.proci.2014.07.054
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/7017