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Impinging Diesel Sprays
Scania CV AB.
Scania CV AB.ORCID iD: 0000-0001-9483-7992
2008 (English)In: Atomization and sprays, ISSN 1044-5110, E-ISSN 1936-2684, Vol. 18, no 2, 97-127 p.Article in journal (Refereed) Published
Abstract [en]

Diesel fuel sprays from a common-rail injector have been optically investigated with respect to their macroscale characteristics. The tested nozzle designs were of standard plain orifice type, as well as the impinging-spray type, in which two orifices intersect at a specific angle at the exit. Testing was conducted using a pressurized vessel at room temperature. The impinging sprays were found to be low penetrating and widely dispersed compared to the nonimpinging sprays. The shape of the impinging sprays was as one homogeneous spray with no trace of individual sprays. It was found that impinging diesel sprays can be predicted in a manner similar to standard nonimpinging sprays, using a dimensionless penetration correlation. The cone angle of the impinging sprays increases with the impingement angle, and in contrast to nonimpinging sprays, appears insensitive to ambient density. The results indicate that the impinging spray has a larger spray volume at lower ambient densities. However, at higher ambient densities, the volume of the nonimpinging sprays is larger.

Place, publisher, year, edition, pages
2008. Vol. 18, no 2, 97-127 p.
Keyword [en]
Correlation methods; Fuel injection; Pressure vessels; Spraying; Impinging sprays; Room temperature; Diesel fuels; Correlation methods; Diesel fuels; Fuel injection; Pressure vessels; Spraying
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6776ISI: 000248847200001OAI: oai:DiVA.org:kth-6776DiVA: diva2:11581
Note
QC 20100825. Uppdaterad från Accepted till Published 20100825.Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2017-12-14Bibliographically 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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