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This paper deals with the influence of the fuel characteristics, mainly fuel density and viscosity on the injection system and spray behaviour. Experiments have been performed with seven different blends representative of automotive Diesel engine fuels, with a conventional engine injection system, spraying in a high density environment at room temperature. Injection rate measurements allow for the analysis of the influence of the fuel properties on the injection system, and high speed imaging and PDA measurements were used to get insight into the spray behaviour and atomisation process. The experimental results obtained have been fitted to simple equations to get predictive capabilities.

The objective of the work presented here is to evaluate the potential of rape oil methyl ester (RME) to improve the combustion process in a high-speed direct injection (HSDI) Diesel engine equipped with high-pressure common-rail injection system. The study, based on the comparison of three different fuels (standard gas-oil, RME and 30% RME/gas-oil mixture), takes into account the main aspects that control Diesel combustion, from the injection rate characteristics to the spray behaviour characterised using an optical pressurised chamber. This global study of the whole injection-combustion process allows identifying some causes of the decrease in pollutant emissions observed when the engine operates with RME.