Lappeenranta University of Technology
Department of Energy Technology
Nyyssönen, Sami
Master’s thesis
Lappeenranta, 2001
126 pages, 46 pictures, 18 tables, 4 appendices
Supervisor: Jaakko Larjola
Keywords: internal combustion engine, Diesel engine, simulation
The object of the work was to optimise the working parameters of the Z-motor invented by Timo Janhunen. A calculation method was developed for calculating Z-motor. The valve timing and lift, heat release during combustion, temperatures and pressures in different positions in the process, and geometrical compression ratio were determined by using the calculation method. The efficiency, maximum power, and emissions of the new engine were taken into consideration.
Universal laws of thermodynamics were used in the simulation of the engine. The cylinder process was simulated using process simulation software developed by Martti Larmi. Effects of different parameters to the operating values of the engine were studied. Good results were achieved when compared with the reference engine, especially in the efficiency on partial load. Applicable rates of heat release curves were defined in the work. Realising of the desired heat release by controlling fuel injection requires further research.