Effect of mixture constituents on the laminar burning velocity of LPG-Co2-air mixtures

One of the most attractive applications of Liquefied petroleum gas (LPG) is its use in IC engines, particularly for automotive applications, as it is known to be a clean source of energy. Even though it is already being used in IC engines, the fundamental combustion properties such as laminar burning velocities, which is a physicochemical property of a fuel, is still not very well established, which can act as a basic input for engine modeling. The present work utilizes a few standard methods of flame speed measurement known from the literature to obtain the flame speed of LPG-air and LPG-air-diluent mixtures as a function of air-fuel ratio and diluent concentration. Variation of burning velocity obtained by two different experimental techniques, that is, orifice burner and cylindrical tube method for a mixture of LPG-air and diluent mixtures at different air fuel ratios is quantified. CO2 is selected as a diluent to account for the presence of exhaust gases in the fresh charge as a consequence of exhaust gas recirculation. It was found that there is effect on burning velocity with the variation of effects of diluents on the burning velocities have been found to cause performance problems for combustion appliances using these types of fuel gases.