Abstract
The Institute of Internal 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 or exhaust gases in diesel oil. The effervescence of diesel oil 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 exhaust gases dissolved in diesel oil 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 CO2, CO, NOx, FSN. Furthermore, the article shows pictures of fuel injection into the open chamber recorded with AVL 513D video system. The heat release for diesel oil-based fuelling system was compared with solution-based fuelling system.
Keywords: CI engine, fuel injection, solution, indicator graph, emission