Numerical Study of Combustion Characteristics, Performance and Emissions of SI Engine Fueled with Different Hydrocarbons Fuels

Abstract

A numerical approach has been designed and modified with Advanced Simulation Technologies Boost to examine the impact of the piston face temperature on the performance of the spark ignition engine, combustion characteristics and emissions when using liquefied petroleum gas (LPG) and petrol fuels at an engine speed of 2500 rpm with a constant throttle position. In this work, a four-cylinder four-stroke spark ignition engine was used. The results show that when the piston face temperature increased, the brake power and the effective torque were reduced. No alteration in the specific brake fuel consumption for both fuels selected at higher piston face temperature has been observed. The peak fire pressure decreases while the peak fire temperature grows slightly when moving from lower to higher temperatures on the piston face. Liquid petroleum gas produced lower effective power and an effective torque compared to the gasoline fuel at all the selected piston face temperature. For both fuels, carbon monoxide and NOx emissions increased, while unburned hydrocarbon emissions decreased dramatically when the temperature of the piston face increased. The LPG emitted lower exhaust gas emissions than the gasoline hydrocarbon fuel at all piston temperatures.