Estimation of Heat Losses in Fuel Combustion by Analysis of Gas Pressure in the Cylinder of Diesel

The energy and heat losses reduction in the process of fuel combustion enables the diesel engines' power and fuel efficiency growth by improving the operating cycle indicators. The fuel combustion process efficiency depends on the completeness of the emission and use of the burning fuel heat. The most important factors that determine the level of heat losses are the combustion process duration, the fuel-air mixture composition, and the crankshaft rotation frequency. It is established that the combustion efficiency coefficient increases with the reduction of the combustion process duration; the more intensive the coefficient increase, the lower the crankshaft rotation speed and the greater the excess air ratio. The factors' influence on the combustion process efficiency is determined from the thermodynamic analysis results of the gas pressure indicator diagrams in the diesel cylinder.