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dc.contributor.author
Park, Hyunchun
dc.contributor.author
Kyrtatos, Panagiotis
dc.contributor.author
Bolla, Michele
dc.contributor.author
Lee, Yongseok
dc.contributor.author
Yoon, Wookhyeon
dc.contributor.author
Boulouchos, Konstantinos
dc.date.accessioned
2021-03-31T08:44:49Z
dc.date.available
2019-07-31T10:55:14Z
dc.date.available
2019-07-31T13:23:38Z
dc.date.available
2020-01-17T10:29:52Z
dc.date.available
2021-03-31T08:44:49Z
dc.date.issued
2019-08
dc.identifier.uri
http://hdl.handle.net/20.500.11850/355997
dc.description.abstract
Stringent emission regulations and low price of natural gas make dual-fuel (DF) engines an attractive solution in the large engine market. DF engines have drawn keen attention because of their low emissions in gas mode (CO2, NOx, SOx and particulate matter) which can comply with emission regulations without the use of a costly aftertreatment system, and flexible operation with either natural gas or diesel fuel depending on situations. Nevertheless, DF engines show relatively lower power density and thermal efficiency compared to conventional diesel engines due to their lower compression ratio to prevent abnormal combustion (knocking and pre-ignition) and their premixed combustion governed phenomena, which lead to combustion instabilities. Despite the fact that there have been many efforts to improve DF combustion engines in the past, the dual-fuel combustion process is still not well understood, especially in medium-speed engines. Combustion is initiated with the injection of a small amount of diesel fuel (usually 0.5 to 2 % of total energy at full load) which auto-ignites after a long ignition delay. Once the diesel fuel ignites, it leads to a subsequent lean homogeneous air-fuel mixture combustion. These subsequent combustion processes are highly complex, involving autoignition chemistry, premixed turbulent flame propagation and the transition between the two which is not well understood. Thus, it is necessary to find out the effects of various operation and control parameters on DF combustion, in order to improve the engine performance. The present work focuses on the analysis of DF combustion in Hyundai Heavy Industries' H35DF dual-fuel medium-speed engine. The analysis is performed on engine measurements where operating conditions were varied, in combination with an empirical combustion model. Operating condition variations include micro pilot (MP) injection timing, MP injection duration, MP injection pressure, air chamber conditions and compression ratio. The model is used in order to improve the understanding of changes observed through variations in the measurements. To this end, a double vibe function is employed to express the heat release rate mathematically. Each test data is analyzed individually to have a vibe fitted heat release rate. Vibe parameters obtained here are used as the target values, and engine parameters are used as the input values to find the appropriate correlations. The correlations are developed using the linear method. The correlations predict vibe parameters with sufficient accuracy. The developed combustion model well predicts the dual-fuel combustion phenomenon. The DF combustion model is utilized to understand the effects of each parameter on the heat release rate of DF combustion and can be used for the optimization of engine performance.
en_US
dc.language.iso
en
en_US
dc.publisher
CIMAC
en_US
dc.title
Combustion Modeling of a Medium-Speed Dual-Fuel Engine Using Double Vibe Function
en_US
dc.type
Conference Paper
ethz.book.title
CIMAC CONGRESS 19, 29th CIMAC World Congress on Combustion Engine, Meeting the Future of Combustion Engines
en_US
ethz.pages.start
019
en_US
ethz.size
11 p.
en_US
ethz.event
29th World Congress on Internal Combustion Engines (CIMAC 2019)
en_US
ethz.event.location
Vancouver, BC, Canada
en_US
ethz.event.date
June 10-14, 2019
en_US
ethz.notes
Conference lecture held on June 13, 2019
en_US
ethz.publication.place
s.l.
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02668 - Inst. f. Energie- und Verfahrenstechnik / Inst. Energy and Process Engineering::03611 - Boulouchos, Konstantinos (emeritus) / Boulouchos, Konstantinos (emeritus)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02668 - Inst. f. Energie- und Verfahrenstechnik / Inst. Energy and Process Engineering::03611 - Boulouchos, Konstantinos (emeritus) / Boulouchos, Konstantinos (emeritus)
en_US
ethz.date.deposited
2019-07-31T10:55:21Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-03-31T08:45:01Z
ethz.rosetta.lastUpdated
2021-03-31T08:45:01Z
ethz.rosetta.versionExported
true
ethz.COinS
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