Availability analysis of composition of straight run and catalytic cracking gasoline during combustion process of gasoline engine

Key words:  gasoline engine  availability  straight run gasoline  catalytic cracking gasoline  combustion model

Abstract:

According to the transformation regularity of fuel energy in the gasoline engine combustion process with blended gasoline, the fuel blending component model and the thermodynamic quasi-dimensional two-zone model were established. The changes of availability and loss of irreversibility as a function of crank angle during the combustion process with straight run gasoline and catalytic cracking gasoline were studied by numerical simulation respectively. In the fuel blending component model, i-octane, n-heptane, methyl cyclohexane and toluene were treated as the substitute for straight run gasoline components, simultaneously, i-octane, n-heptane, methyl cyclohexane, toluene and 1- pentene as the substitute for catalytic cracking gasoline. The results show that the total exergy destruction of the catalytic cracking gasoline(36.01％)was lower than that of the straight run gasoline(about 40.07％). During the combustion process, the exergy destruction of the catalytic cracking gasoline due to heat transfer was larger than that of the straight run gasoline, while the exergy destruction due to combustion was smaller. The differences of the exergy destruction during the combustion process appear to be related to the kind and content of the hydrocarbon compositions in the blended gasoline.