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The effect of piston bowl temperature on diesel exhaust emissions

Ladommatos, N; Xiao, Z; Zhao, H; (2005) The effect of piston bowl temperature on diesel exhaust emissions. P I MECH ENG D-J AUT , 219 (D3) 371 - 388. 10.1243/095440705X6550. Green open access

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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.

Type: Article
Title: The effect of piston bowl temperature on diesel exhaust emissions
Open access status: An open access version is available from UCL Discovery
DOI: 10.1243/095440705X6550
Keywords: piston bowl, diesel exhaust, emissions, direct injection diesel engine, piston temperature, particulate, smoke
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/11709
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