Diesel spray formation, autoignition and soot production at elevated in-cylinder pressures
Crua, C., Heikal, M.R. and Gold, M.R. (2004) Diesel spray formation, autoignition and soot production at elevated in-cylinder pressures In: 12th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 12-15 July, 2004.
Official URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2004/
Through the combination of various optical diagnostic techniques an analysis has been undertaken of the effects of incylinder and injection pressures on the formation and combustion of diesel sprays at realistic automotive in-cylinder conditions. The results were obtained with high-speed video and phase Doppler anemometry (PDA) of the liquid phase, high-speed schlieren video of the vapour phase, high-speed video of autoignition and laser-induced incandescence (LII) of soot. Output results containing spray dispersion angles, droplet sizes and velocities, tip penetrations with time, autoignition delays and relative soot concentrations are presented offering an insight into the common rail diesel spray formation, mixing and combustion processes. The tests were performed on a single-cylinder 2.2 litre rapid compression diesel machine with optical access to the combustion chamber. A common rail injection system was used with an injector mounted with a single-hole nozzle. The injection pressure was varied from 60 to 160 MPa, the in-cylinder pressure and temperature at top dead centre from 2 to 10 MPa and from 540 to 720 K, respectively. The results obtained from the various optical measurement techniques were comb ined in order to produce a comprehensive observation of diesel spray development and combustion.
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