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Fuel Sprays for Premixed Compression Ignited Combustion: Characteristics of Impinging Sprays
Scania CV AB.
Scania CV AB.ORCID iD: 0000-0001-9483-7992
2004 (English)In: SAE 2004 World Congress & Exhibition Technical Papers: Diesel Fuel Injection & Sprays (Part 3 & 4), 2004, Vol. 01-1776, 2004-01-1776- p.Conference paper, Published paper (Refereed)
Abstract [en]

For homogeneous charge compression ignition (HCCI) engines with direct-injected fuel (also called PCI, Pre-mixed Compression Ignition), it is important to achieve a lean and homogeneous mixture before ignition. For this purpose, impinging diesel sprays have proven to be useful. In this study, an evaluation of the overall air/fuel ratio of such sprays was made in a test rig. The test rig consists of a pressurized vessel with optical access and a Common Rail (CR) fuel injection system. The investigation was made for impinging spray nozzles with different impingement angles and orifice diameters. Three gas back pressures and three injection pressures were evaluated. The evaluation was based on images of the fuel sprays taken in the test rig. The fuel spray images were automatically processed using in-house developed software. The results of the investigation points out some important factors to obtain a lean spray, (a high air/fuel ratio). The investigation also points out some factors that give a low spray penetration for a certain injected mass of fuel.

Place, publisher, year, edition, pages
2004. Vol. 01-1776, 2004-01-1776- p.
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6773DOI: 10.4271/2004-01-1776OAI: oai:DiVA.org:kth-6773DiVA: diva2:11578
Conference
SAE 2004 World Congress & Exhibition, March 2004, Detroit, MI, USA, Session: Diesel Fuel Injection & Sprays
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, Andreas

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Citation style
  • apa
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