| Abstract [eng] |
The dissertation deals with the changes of energy and ecological parameters of high-speed compression-ignition internal combustion engine, with conventional fuel injection system, convertible to dual-fuel diesel-natural gas fuelled engine. Considering the specificity of dual-fuel combustion influencing the performance of the combustion process characteris-tic, the method of improving the energy and ecological parameters of the dual-fuel engine by early liquid fuel injection phase was evaluated. Limitations of the improvement of energy and ecological indices for the object of study were investigated and confirmed by numerical mathematical modelling. The heat and exergy balance of the dual-fuel engine was investiga-ted and the efficiency of utilization of secondary heat sources and the total efficiency of en-gine operation were evaluated. Based on complex experimental and mathematical numerical modelling research methodological foundations, which do not require large amount of comp-lex data of engine design and work process parameters, to predict the change of energy values of the convertible engine due dual fuel operation. |
