Abstract
Keywords - CI engine, alternative fuels, emissions, dissolving process
The Institute of Combustion Engines and Transportation has developed a concept of fuelling diesel engines with an improved mechanism of spray. The proposed novelty value of spray consists in dissolving either air, exhaust gases or oxygen in diesel fuel. The effervescence of diesel fuel mixed with gases is to facilitate the spray. In the nonequilibrium states of a solution, formed as a result of dissolving gas in a liquid, the gaseous phase is spontaneously released from the solution. This process has a volumetric character and at the appropriate kinetics it is strong enough to be accompanied by the effervescence (bubbling) of the liquid. At the moment, widespread researches are made in order to evaluate the practical application of the concept in injection systems. The article presents the results of tests for the impact of oxygen dissolved in diesel fuel on the combustion process in diesel engines. The tests were done in the piston head of an engine equipped with a toroidal combustion chamber and direct injection. During the tests the following factors were measured: the main indicators of motor operation, the range of pressure values obtained in the combustion chamber and before the injector, emission of HC, CO, NOx and FSN. Furthermore, the article shows the analysis of heat release for diesel fuel-based fuelling system was compared with solution-based fuelling system.