Effects of E-diesel on the combustion characteristics of a diesel engine operating at different boost pressures

The diesel fuels containing 10% and 15% ethanol are known as E-diesel. This study investigates E-diesel's effects on the diesel cycle and combustion phases under different boost pressure applications. As a result of this study, it was monitored that there is an almost linear correlation between the cylinder gas pressure and the boost pressure during both the intake and power cycles. The maximum pressure rising rate, the ignition delay, and the combustion noise level increased by using E-diesel compared to diesel fuel in all boost pressure applications. It was observed that there was a slight increase in the knock tendency of the diesel engine with the use of E-diesel. The premixed combustion was enhanced with E-diesel, but the controlled combustion stage has a similar trend to neat fossil diesel fuel. The mean convective heat transfer coefficient decreased proportionally with the alcohol content in the mixture. An increase in combustion rate was observed with E-diesel, indicating that flame propagation velocity improved. In order to evaluate the combustion behavior of E-diesel fuels in more detail, the laminar flame velocity of pure ethanol/air, pure butanol/air, and diesel/air mixtures have been reviewed relative to the initial temperature.