High-Speed Photography of Fuel Spray and Combustion Events in a Production Diesel Engine and Combustion Bomb

Abstract
The endoscopic high-speed combustion photography technique was used on a four-cylinder Perkins engine to investigate spray formation and combustion events under different engine running conditions. Some tests were also carried out in a fixed-volume combustion chamber (bomb) using conditions similar to those of the engine. The major advantage of using this rig was that each parameter could be varied independently. Spray formation, penetration rate and evaporation were studied in detail. Ignition delay times were established and the location of the start of combustion was identified. Finally, in the analysis of the results the most important factors affecting combustion in a direct injection (DI) diesel engine were outlined.

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