Injection Nozzle Coking Mechanism in Common-rail Diesel Engine

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Injection Nozzle Coking Mechanism in Common-rail Diesel Engine

Omae, Kazuhiro / Sunami, Kazuo / Nakai, Kyoko / Ikemoto, Masato / Kakehashi, Nobuhisa / Ueda, Reiko

The hole diameter of injection nozzles in diesel engines has become smaller and the nozzle coking could potentially cause injection characteristics and emissions to deteriorate. In this research, engine tests with zinc-added fuels, deposit analyses, laboratory tests and numerical calculations were carried out to clarify the deposit formation mechanisms. In the initial phase of deposit formation, lower zinc carboxylate formed close to the nozzle hole outlet by reactions between zinc in the fuel and lower carboxylic acid in the combustion gas. In the subsequent growth phase, the main component changed to zinc carbonate close to nozzle hole inlet by reactions with CO₂ in the combustion gas. Metal components and combustion gases are essential elements in the composition of these deposits. One way of removing these deposits is to utilize cavitations inside the nozzle holes.

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Dokumentinformationen

Titel :

Injection Nozzle Coking Mechanism in Common-rail Diesel Engine

Weitere Titelangaben:

Sae Int. J. Fuels Lubr
Sae International Journal of Fuels and Lubricants

Beteiligte:

Omae, Kazuhiro (Autor:in) / Sunami, Kazuo (Autor:in) / Nakai, Kyoko (Autor:in) / Ikemoto, Masato (Autor:in) / Kakehashi, Nobuhisa (Autor:in) / Ueda, Reiko (Autor:in)

Kongress:

SAE International Powertrains, Fuels and Lubricants Meeting ; 2011

Erschienen in:

Sae International Journal of Fuels and Lubricants ; 5 , 1 ; 78-87

Erscheinungsdatum :

2011-08-30

Format / Umfang :

10 pages

ISSN :

1946-3952 , 1946-3960

DOI :

https://doi.org/10.4271/2011-01-1818