Effect of Different Fuels on Combustion and Emission Components of CI Engines

Combustion characteristics of different fuels (diesel, toluene, n-butanol, n-heptane and methane) of a direct injection diesel engine during combustion were investigated using computational fluid dynamics (CFD) simulation techniques. The relationship between fuel combustion reaction components and combustion temperature and turbulence rate was analyzed. The results show that the calculated value of the cylinder temperature verifies the correctness of the model. From the simulation results, it can be found that the total temperature in the n-heptane cylinder has the smallest NOx and the largest turbulence rate. However, in the n-heptane cylinder, the NOx and SO2 reactive groups generated by the combustion reaction are the least. From the simulation results, it can be found that the different fuels have different reaction characteristics inside the engine, and the reaction products are caused by the physical and chemical properties contained therein. Due to the limitations of the simulation, we can compare the reaction characteristics and exhaust emission characteristics of other fuels in future experiments and simulation studies.