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Assesment of thermodynamic cycle of internal combustion engine in terms of rightsizing

The modification of the downsizing trend of internal combustion engines towards rightsizing is a new challenge for designers. The desire to meet the requirements set by the new legislative provisions, especially concerning the reduction of exhaust emissions against users' expectations, such as the comfort of driving or the possibility of transporting a given volume of cargo, determine the sustainable development of means of transport. Design activities are associated primarily with the increase in specific power as one of the significant engine performance indicators. The change in the stroke volume of internal combustion engines accompanying the rightsizing idea may in fact mean a reduction or increase in the coefficients defining the displacement volume, and thus may affect the change in the operating characteristics as a result of changes in the combustion process parameters. Each change in the geometrical volume of the combustion chamber is accompanied by a change in the conversion of energy contained in the fuel. In this study, the assessment of the geometric change in the displacement volume of an internal combustion engine was made, analyzing its impact on the efficiency of the cycle. Incidents of changes in the displacement volume were considered along with the change of the compression space and at the change of the geometric degree of compression. The new form of the mathematical dependence describing the efficiency of the cycle makes it possible to evaluate the indicators of the operation of the internal combustion engine with the implementation of the rightsizing idea. The paper shows the dependence of cycle efficiency with different forms of rightsizing.
Topic: Combustion processes in SI and CI engines
Author: Zbigniew J. Sroka
Co-authors: Maciej Dworaczyński