1. Towards identifying flame patterns in multiple, late injection schemes on a single cylinder optical diesel engine
- Author
-
Yannis Hardalupas, D. Touloupis, Ch. Hong, Maria A. Founti, A. M. K. P. Taylor, G.K. Ramaswamy, Ch. Keramiotis, G. Vourliotakis, N. Soulopoulos, and Ford Motor Company Ltd
- Subjects
Work (thermodynamics) ,020209 energy ,General Chemical Engineering ,Optical measurements ,Analytical chemistry ,General Physics and Astronomy ,Energy Engineering and Power Technology ,02 engineering and technology ,Diesel engine ,medicine.disease_cause ,Combustion ,7. Clean energy ,Cylinder (engine) ,law.invention ,Luminosity ,0203 mechanical engineering ,law ,0202 electrical engineering, electronic engineering, information engineering ,medicine ,Energy ,Chemistry ,Mechanical Engineering ,General Chemistry ,Chemical Engineering ,Soot ,020303 mechanical engineering & transports ,Fuel Technology ,13. Climate action ,Bar (unit) - Abstract
The work investigates the effect of various post-injection strategies on the flame patterns in a Ricardo Hydra optical single-cylinder, light-duty diesel engine, operated in a partially premixed combustion mode, under low load (IMEP: ca. 2.3 bar), low speed (1200 rpm) conditions. The effect of post-injection fuel amount (12% and 24% of the total fuel quantity per cycle) and post-injection timing (0, 5, 10 deg aTDC) are investigated via pressure trace analysis and optical measurements. Flame propagation is captured by means of high-speed flame natural luminosity imaging and of CH*, C2*, and OH* line-of-sight chemiluminescence measurements. Results suggest that post-injections suppress mixture reactivity but enhance oxidation, and that a larger amount of fuel and/or later post-injection, leads to higher levels of natural luminosity, indicating possible higher soot-out emissions, while post-injection close to the main combustion event appears to have a beneficial effect on the soot oxidation processes.
- Published
- 2016