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Effect of Injection Pressure and Engine Speed on Air/Fuel Mixing and Emissions in a Pre-Mixed Compression Ignited (PCI) Engine using Diesel Fuel
Scania CV AB.
Scania CV AB.ORCID iD: 0000-0001-9483-7992
KTH, Superseded Departments, Machine Design.ORCID iD: 0000-0003-2489-0688
KTH, Superseded Departments, Machine Design.
2004 (English)In: 2004 Powertrain & Fluid Systems Conference & Exhibition Technical Papers, 2004, Vol. 01-2989, 2004-01-2989- p.Conference paper, Published paper (Refereed)
Abstract [en]

PCI combustion of diesel fuel was accomplished in a direct-injected heavy-duty single-cylinder research engine. An impinging spray nozzle combined with a shallow bowl piston design offered a short air/fuel mixing time. Low HC and CO emissions were observed compared to fully premixed operation using n-heptane. A method for evaluating the air/fuel mixing process has been established by quantifying the in-cylinder air/fuel heterogeneity with the NOx emission. The results indicate that high injection pressure and engine speed are favorable for a fast mixing process. The injection pressure had a small impact on HC and CO emissions, while the engine speed had a larger impact. There were no correlation between air/fuel mixing time and HC and CO emissions.

Place, publisher, year, edition, pages
2004. Vol. 01-2989, 2004-01-2989- p.
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6775DOI: 10.4271/2004-01-2989Scopus ID: 2-s2.0-84877237526OAI: oai:DiVA.org:kth-6775DiVA: diva2:11580
Conference
2004 Powertrain & Fluid Systems Conference & Exhibition, October 2004, Tampa, FL, USA, Session: Homogeneous Charge Compression Ignition (Part C&D)
Note
QC 20100825Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2010-08-25Bibliographically approved
In thesis
1. Experimental Investigation of Impinging Diesel Sprays for HCCI Combustion
Open this publication in new window or tab >>Experimental Investigation of Impinging Diesel Sprays for HCCI Combustion
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Engine research and development is to a large extent driven by the quest of lowering exhaust emissions and fuel consumption. The combination of low emissions and low fuel consumption is not the simultaneous characteristic of the world’s primary engine concepts, the diesel and the spark-ignited (SI) engine. However, such a concept do exist, it is commonly called Homogeneous Charge Compression Ignition (HCCI).

The HCCI combustion concept is when a premixed air and fuel mixture is ignited by the heat of compression. The operation is unthrottled, like the diesel engine, which is advantageous for its efficiency. The premixed air / fuel mixture preclude soot formation, like the SI engine. An exclusive feature of HCCI combustion is extremely low NOX production due to low-temperature combustion.

The mixture preparation of the typical gasoline HCCI engine is similar to the SI engine, via port-injection, which results in a well homogenized mixture. Port injection of diesel fuel is however very difficult since the environment is too cold for the fuel to vaporise. A better alternative is therefore direct-injection. However, injection must occur in a way where a homogeneous mixture is formed, while contact of the liquid fuel with cold walls is avoided.

There are many approaches to direct-injected mixture formation. This thesis focuses on exploring the concept of impinging sprays; its characteristics and its impact on combustion and emissions. The work comprises unique information regarding impinging sprays, as well as results regarding engine performance. It is concluded that impinging sprays are well suited for early direct-injection.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. viii, 70 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2006:17
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-4276 (URN)
Public defence
2007-02-21, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 14:00
Opponent
Supervisors
Note
QC 20100824Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2010-08-24Bibliographically approved

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Cronhjort, AndreasOlofsson, Ulf

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