Title: Experimental study on the impact of operating conditions on PCCI combustion

Authors: C.A.J. Leermakers; C.C.M. Luijten; L.M.T. Somers; L.P.H. De Goey; B.A. Albrecht

Addresses: Eindhoven University of Technology, Department of Mechanical Engineering, P.O. Box: 513, 5600 MB Eindhoven, The Netherlands ' Eindhoven University of Technology, Department of Mechanical Engineering, P.O. Box: 513, 5600 MB Eindhoven, The Netherlands ' Eindhoven University of Technology, Department of Mechanical Engineering, P.O. Box: 513, 5600 MB Eindhoven, The Netherlands ' Eindhoven University of Technology, Department of Mechanical Engineering, P.O. Box: 513, 5600 MB Eindhoven, The Netherlands ' DAF Trucks N.V., Engine Integration and Validation, P.O. Box: 90065, 5600 PT Eindhoven, The Netherlands

Abstract: In a short-term scenario, using near-standard components and conventional fuels, PCCI combustion relies on a smart choice of operating conditions. Here, the effects of operating conditions on ignition delay, available mixing time, combustion phasing and emissions are investigated. In the PCCI regime, NOX and smoke have been shown to be efficiently reduced with elongated mixing time. For viable PCCI combustion, one would require a Combustion Delay (CD) which is long enough to bring both NOX and smoke levels down to acceptable values. For the completeness of combustion, the resulting unburned hydrocarbon and carbon monoxide emissions, as well as the associated fuel consumption; mixing time should, however, be as short as possible. Most parameters strongly correlate with combustion delay, independent of how this is achieved. Lastly, the best points experienced for a number of cases are given.

Keywords: PCCI; premixed charge compression ignition; diesel; operating conditions; EGR; exhaust gas recirculation; intake pressure; intake temperature; combustion delay; mixing time; ignition delay; combustion phasing; hydrocarbon emissions; carbon monoxide emissions; fuel consumption.

DOI: 10.1504/IJVD.2013.051611

International Journal of Vehicle Design, 2013 Vol.62 No.1, pp.1 - 20

Available online: 23 Jan 2013 *

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