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The main objective of the present work was to investigate the influence of additive 2-ethylhexyl-nitrate (2-EHN) on the characteristics of auto-ignition and combustion of rapeseed oil (used as biofuel in diesel engines). The biofuel for diesel engines must meet several goals: to ensure a safe and fast engine start at any environmental temperature, to allow a safe operation of the engine with a yield as high as possible, to burn completely without producing harmful substances for human health, while maintaining the properties. In this sense, the purpose of the experimental research has been to determine: cetane number, ignition delay, the start of the main combustion, the combustion period of crude and filtered rapeseed oil additived in proportions of 1%, 1.5% and 2% with 2-ethylhexyl-nitrate compared with diesel fuel (witness fuel).

Keywords: rapeseed oil, 2-ethylhexyl-nitrate, cetane number, ignition delay