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A study of in-cylinder fuel spray formation and its influence on exhaust emissions using an optical diesel engine
KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).
KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.).
2010 (Engelska)Ingår i: SAE Technical Papers, 2010, nr 01-1498Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Increasingly stringent emission legislation as well as increased demand on fuel efficiency calls for further research and development in the diesel engine field. Spray formation, evaporation and ignition delay are important factors that influence the combustion and emission formation processes in a diesel engine. Increased understanding of the mixture formation process is valuable in the development of low emission, high efficiency diesel engines. In this paper spray formation and ignition under real engine conditions have been studied in an optical engine capable of running close to full load for a real HD diesel engine. Powerful external lights were used to provide the required light intensity for high speed camera images in the combustion chamber prior to ignition. A specially developed software was used for spray edge detection and tracking. The software provides crank angle resolved spray penetration data. The images also provide data of ignition delay, ignition location and premixed flame propagation. The evaluation was made for an array of engine operation points with variations in fuel rail pressure, injection timing, boost pressure and charge air temperature. The influence of using pilot injections has also been investigated. This set of experiments makes it possible to analyze the impact of the various engine parameters on the spray formation and ignition processes. Some of the results are compared with the exhaust emission measurements in order to provide an insight into how the emission formation process is influenced by the spray formation and ignition processes.

Ort, förlag, år, upplaga, sidor
2010. nr 01-1498
Serie
SAE Technical Papers, ISSN 0148-7191
Nationell ämneskategori
Maskinteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-34254DOI: 10.4271/2010-01-1498Scopus ID: 2-s2.0-84877187746OAI: oai:DiVA.org:kth-34254DiVA, id: diva2:419863
Konferens
International Powertrains, Fuels and Lubricants Meeting; Rio De Janeiro; Brazil; 5 May 2010 through 5 May 2010
Anmärkning

QC 20110530

Tillgänglig från: 2011-05-30 Skapad: 2011-05-30 Senast uppdaterad: 2014-08-19Bibliografiskt granskad
Ingår i avhandling
1. Methods for Characterization of the Diesel Combustion and Emission Formation Processes
Öppna denna publikation i ny flik eller fönster >>Methods for Characterization of the Diesel Combustion and Emission Formation Processes
2011 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In this thesis various aspects of the diesel engine fuel injection, combustion and emission formation processes have been evaluated. Several types of evaluation tools and methods have been applied. Fuel spray momentum was used to characterize injection rate and hole-to-hole variations in fuel injectors. Using both instantaneous fuel impulse rates and instantaneous mass flow measurements, spray velocity and nozzle flow parameters were evaluated. Several other hole-to-hole resolved injector characterization methods were used to characterize a set of fuel injectors subjected to long term testing. Fuel injector nozzle hole-to-hole variations were found to have a large influence on engine efficiency and emissions. The degree of hole-to-hole variations for an injector has been shown to correlate well with the performance deterioration of that injector. The formation and atomization of fuel sprays, ignition onset and the development of diffusion flames were studied using an optical engine. Flame temperature evaluations have been made using two different methods. NO-formation depends strongly on flame temperature. By applying a NO-formation evaluation method based on both heat release rate and flame and gas temperature it was possible to achieve a reasonable degree of correlation with measured exhaust emissions for very varying operating conditions. The prediction capability of the NO-formation evaluation method was utilized to evaluate spatially and temporally resolved NO-formation from flame temperature distributions. This made it possible to pinpoint areas with a high degree of NO-formation. It was found that small hot zones in the flames can be responsible for a large part of the total amount of NO that is produced, especially in combustion cases where no EGR is used to lower the flame temperature. By applying optical diagnostics methods the combustion and emission formation phenomena encountered during production engine transients were evaluated. The transient strategy of the engine involved reducing the EGR-rate to zero during the initial parts of the transient. Increased general flame temperature and the occurrence of small hot zones were found to explain the increase in NO-emissions during these transients.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2011. s. 111
Serie
Trita-MMK, ISSN 1400-1179 ; 2011:10
Nyckelord
diesel engine emissions
Nationell ämneskategori
Farkostteknik
Forskningsämne
SRA - Energi
Identifikatorer
urn:nbn:se:kth:diva-34140 (URN)978-91-7501-037-3 (ISBN)
Disputation
2011-06-08, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
StandUp
Anmärkning
QC 20110530Tillgänglig från: 2011-05-30 Skapad: 2011-05-26 Senast uppdaterad: 2011-09-13Bibliografiskt granskad

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Lindström, MikaelÅngström, Hans-Erik
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Maskinkonstruktion (Avd.)Maskinkonstruktion (Inst.)
Maskinteknik

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