UNSPECIFIED. (2005) The effect of piston bowl temperature on diesel exhaust emissions. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING, 219 (D3). pp. 371-388. ISSN 0954-4070

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Abstract

In modern, high-speed, direct injection diesel engines for passenger vehicles, there is extensive impingement of the fuel sprays on to the piston bowl walls. Recent trends towards smaller engine sizes, equipped with high-pressure common-rail fuel injection systems, have tended to increase the spray/piston wall interaction. This paper describes tests carried out in a high-speed direct injection automotive diesel engine, during which the temperature of the piston was increased in a controlled manner between 189 and 227 degrees C while being continuously monitored. The aim of the work was to quantify the effects of piston temperature on pollutant exhaust emissions. The results show a significant reduction in unburned hydrocarbon emission, a significant increase in smoke emission, and no significant change in the emission of oxides of nitrogen. The increase in smoke emission cannot be ascribed to changes in the engine volumetric efficiency or air-fuel ratio. The paper demonstrates that fuel spray deposition on the piston surface was in the form of a thin film that did not experience bulk boiling. A number of suggestions are put forward to help explain the observed changes in exhaust emissions with increasing piston temperature.

Item Type:	Journal Article
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TA Engineering (General). Civil engineering (General)
Journal or Publication Title:	PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
Publisher:	PROFESSIONAL ENGINEERING PUBLISHING LTD
ISSN:	0954-4070
Date:	March 2005
Volume:	219
Number:	D3
Number of Pages:	18
Page Range:	pp. 371-388
Identification Number:	10.1243/095440705X6550
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/7098

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