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Title: A comparison of the flow fields generated for spark and controlled auto-ignition
Authors: Pitcher, Graham
Turner, James W.G.
Wigley, Graham
Chen, Rui
Keywords: Internal combustion engines
Valve train systems
Exhaust gas recirculation
Issue Date: 2003
Publisher: © Society of Automotive Engineers of Japan
Citation: PITCHER, G. ... (et al.), 2003. A comparison of the flow fields generated for spark and controlled auto-ignition. Presented at: 2003 JSAE/SAE International Spring Fuels and Lubricants Meeting, Yokohama, Japan, 19-22 June.
Series/Report no.: JSAE Paper;20030223
SAE Technical Paper;2003-01-1798
Abstract: Valve timing strategies aimed at producing internal exhaust gas re-circulation in a conventional spark ignition, SI, engine have recently demonstrated the ability to initiate controlled auto-ignition, CAI. Essentially the exhaust valves close early, to trap a quantity of hot exhaust gases in-cylinder, and the fresh air-fuel charge is induced late into the cylinder and then mixing takes place. As a logical first step to understanding the fluid mechanics, the effects of the standard and modified valve timings on the in-cylinder flow fields under motored conditions were investigated. Laser Doppler anemometry has been applied to an optical engine that replicates the engine geometry and different valve cam timings. The cycle averaged time history mean and RMS velocity profiles for the axial and radial velocity components in three axial planes were measured throughout the inlet and compression stroke. The turbulent mixing for the two cases are described in terms of the flow field maps of the velocity vectors, vorticity and turbulence kinetic energy and the integrated tumble ratio as a function of crankangle.
Version: Published
DOI: 10.4271/2003-01-1798
URI: https://dspace.lboro.ac.uk/2134/15621
Publisher Link: http://dx.doi.org/10.4271/2003-01-1798
Appears in Collections:Conference Papers and Presentations (Aeronautical and Automotive Engineering)

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