Inproceedings,
Experimental study of HC emissions using narrow spray cone angles and different surrogate fuels in low temperature diesel combustion systems
FISITA World Automotive Congress, September 14th-19th, Munich, Germany, 1 - 7, ATZ/ATZautotechnology, (2008)
Abstract
esel engine exhaust contains emissions other than CO2, reductions in such emissions is a high priority issue. PM and NOx have been major constituents of the Diesel emissions and the regulations are getting stringent. But these Diesel emissions are difficult to reduce due to the broad range of fuel-air mixtures present during the combustion process. In a conventional Diesel engine, air is gradually drawn into the fuel spray from the surrounding area. The ignition delay period is short, so combustion starts before the fuel has thoroughly mixed with the air. Consequently, the centre of the spray is overly rich, resulting in smoke, while a stoichiometric mixture is formed in the surrounding area, resulting in a high NOx concentration. In order to develop a low emission engine, research is necessary to come up with a new combustion strategy for Diesel engine. The new combustion strategies such as LTC (low temperature combustion) for Diesel engine have been widely studied as a combustion technology to avoid NOx and smoke formation regions simultaneously. In PCCI (premixed charged compression ignition) approach the combustion temperature is lowered by forming a lean premixture which simultaneously and substantially reduces NOx and smoke.
