THERMAL SCIENCE

International Scientific Journal

EMISSION CHARACTERISTICS OF ISO-PROPANOL/GASOLINE BLENDS IN A SPARK-IGNITION ENGINE COMBINED WITH EXHAUST GAS RE-CIRCULATION

ABSTRACT
Experiments were carried out in a spark-ignition engine fueled with iso-propanol/gasoline blends. Emission characteristics of this engine were investigated experimentally, including gaseous emissions (HC, CO, NOx) and particulate matter emission in term of number and size distributions. The effects of different iso-propanol percentages, loads and exhaust gas recirculation rates on emissions were analyzed. Results show that the introduction of exhaust gas recirculation reduces the NOx emission and NOx emission gives the highest value at full load condition. HC and CO emissions present inconspicuous variations at all the loads except the load of 10%. Additionally, HC emission shows a sharp increase for pure propanol when the exhaust gas recirculation rate is up to 5%, while little variation is observed at lager exhaust gas recirculation rates. Moreover, the particulate matter number concentration increases monotonically with the increase of load and the decrease of exhaust gas recirculation rate. There exists a critical spark timing that produces the highest particulate matter number concentration at all the blending ratios.
KEYWORDS
PAPER SUBMITTED: 2013-01-31
PAPER REVISED: 2013-06-18
PAPER ACCEPTED: 2013-06-24
PUBLISHED ONLINE: 2013-07-06
DOI REFERENCE: https://doi.org/10.2298/TSCI130131086G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2014, VOLUME 18, ISSUE 1, PAGES [269 - 277]
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© 2018 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence