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Numerical study on spray and combustion characteristics of diesel and soy-based biodiesel in a CI engine SCIE SCOPUS

Title
Numerical study on spray and combustion characteristics of diesel and soy-based biodiesel in a CI engine
Authors
Lee, YHuh, KY
Date Issued
2013-11
Publisher
ELSEVIER SCI LTD
Abstract
This study is to investigate spray, combustion and emission characteristics of mixtures of diesel and soy-based biodiesel in a CI engine. A surrogate mechanism is developed by combining the skeletal mechanisms of methyl butanoate and n-heptane. Thermophysical properties are validated against measured tip penetrations and Sauter mean diameters (SMDs) of nonreacting sprays. Biodiesel shows spray characteristics of larger SMD's, lower volatility and slower mixing with ambient air due to larger viscosity and surface tension. Engine simulation is performed by the CMC-ISR model to resolve coupling between chemistry and turbulence. There is no noticeable difference in ignition delays of diesel and biodiesel, while flame propagates slower with slower evaporation and mixing for biodiesel. Results are in good agreement for pressure traces, NOx and trends of variation of CO and PM in a range of operating conditions. NOx decreased for BD < 60% and increased for BD > 60% with increasing biodiesel fraction, while PM and CO decreased due to the oxygen content in biodiesel in the test engine. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
Keywords
Diesel; Biodiesel; Spray; Conditional moment closure (CMC); Biodiesel surrogate; CONDITIONAL MOMENT CLOSURE; METHYL BUTANOATE; TURBULENT COMBUSTION; FUELS; AUTOIGNITION; EMISSIONS; MODEL; OIL
URI
https://oasis.postech.ac.kr/handle/2014.oak/14470
DOI
10.1016/J.FUEL.2013.05.106
ISSN
0016-2361
Article Type
Article
Citation
FUEL, vol. 113, page. 537 - 545, 2013-11
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허강열HUH, KANG YUL
Dept of Mechanical Enginrg
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