A Study on the Diesel Engine Mixed with Gaseous Fuel in the Intake Pipe

Abstract

The lean combustion limit of methane-air mixture around gasoil sprays in the direct injection diesel engine has been measured experimentally. The experimental results show if the equivalence ratio of the mixture which is formed in the intake pipe is greater than 0.034, the mixture burns and the output power which is 15 % of calorific value of supplied methane is produced. It is confirmed that the intensity of combustion luminance which measured by using of optical fiber thermometer decreases with increasing of supplying methane. The time histories of pressure and temperature in the cylinder have been calculated by the modified two zone model which is developed to apply for diesel fumigation system. The lean combustion limit of the mixture around gasoil sprays is estimated by thismodel.