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The Influence of Crevices on Hydrocarbon Emissions from a Diesel-Methane Dual Fuel Engine
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
2013 (English)In: SAE International Journal of Engines, ISSN 1946-3936, Vol. 6, no 2, 751-765 p.Article in journal (Refereed) Published
Abstract [en]

Emissions of unburned methane are the Achilles heel of premixed gas engines whether they are spark ignited or diesel pilot ignited. If the engine is operated lean, lower temperatures prevail in the combustion chamber and several of the mechanisms behind the hydrocarbon emissions are aggravated. This paper presents an experimental investigation of the contribution from combustion chamber crevices and quenching to the total hydrocarbon emissions from a diesel-methane dual fuel engine at different operating conditions and air excess ratios. It is shown that the sensitivity to a change in topland crevice volume is greater at lean conditions than at stoichiometry. More than 70% of hydrocarbon emissions at air excess ratios relevant to operation of lean burn engines can be attributed to crevices.

Place, publisher, year, edition, pages
2013. Vol. 6, no 2, 751-765 p.
Keyword [en]
Crevice volumes, Different operating conditions, Experimental investigations, Hydrocarbon emission, Lean condition, Lean-burn engines, Lower temperatures, Total hydrocarbons
National Category
Vehicle Engineering Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-134248DOI: 10.4271/2013-01-0848Scopus ID: 2-s2.0-84878793872OAI: oai:DiVA.org:kth-134248DiVA: diva2:665931
Funder
Swedish Energy Agency
Note

QC 20140304

Available from: 2013-11-21 Created: 2013-11-20 Last updated: 2014-09-15Bibliographically approved
In thesis
1. On Combustion in the CNG-Diesel Dual Fuel Engine
Open this publication in new window or tab >>On Combustion in the CNG-Diesel Dual Fuel Engine
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Currently there is a large interest in alternative transport fuels. There are two underlying reasons for this interest: the desire to decrease the environmental impact of transports and the need to compensate for the declining availability of petroleum. In the light of both these factors, the CNG-diesel dual fuelengine is an attractive concept. The primary fuel of the dual fuel engine is methane, which can be derived both from renewables and from fossil sources. Methane from organic waste, commonly referred to as biomethane, can provide a reduction in greenhouse gases unmatched by any other fuel. Furthermore, fossil methane, natural gas, is one of the most abundant fossil fuels.Thedual fuelengine is, from a combustion point of view, a hybridof the diesel and theOtto-engineand it shares characteristics with both.

From a market standpoint, the dual fuel technology is highly desirable; however, from a technical point of view it has proven difficult to realize. The aim of this project was to identify limitations to engine operation, investigate these challenges, and ,as much as possible, suggest remedies. Investigations have been made into emissions formation, nozzle-hole coking, impact of varying in-cylinder air motion, behavior and root causes of pre-ignitions, and the potential of advanced injection strategies and unconventional combustion modes. The findings from each of these investigations have been summarized, and recommendations for the development of a Euro 6 compliant dual fuel engine have been formulated. Two key challenges must be researched further for this development to succeed: an aftertreatment system which allows for low exhaust temperatures must be available, and the root cause of pre-ignitions must be found and eliminated.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. x, 98 p.
Series
TRITA-MMK, ISSN 1400-1179 ; 2014:08
National Category
Energy Engineering
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-151188 (URN)978-91-7595-243-7 (ISBN)
Public defence
2014-09-26, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Funder
Swedish Energy Agency
Note

QQC 20140915

Available from: 2014-09-15 Created: 2014-09-15 Last updated: 2014-09-15Bibliographically approved

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