A Study of Some Combustion Characterstics of Dual Fuel Engine Using EGR

An experimental investigation has been carried out to study the effects of using exhaust gas recirculation, EGR, on the combustion pressure rise rate and thermal efficiency of a dual fuel engine running on diesel and compressed natural gas. The maximum pressure rise rate during combustion is presented as a measure of combustion noise. Experimental data from the dual fuel engine with EGR has revealed the noise generated from combustion and thermal efficiency at different EGR ratios. A Ricardo E6 diesel engine was converted to run on dual fuel of diesel and compressed natural gas and an exhaust gas recycling system is used throughout the work. The engine was fully computerized and the cylinder pressure data, crank angle data are stored in a PC for off-line analysis. The effects of EGR ratio, engine speeds, loads, temperature of recycled exhaust gases, intake charge pressure, and engine compression ratio on combustion noise and thermal efficiency were examined for the dual fuel engine. The combustion noise and thermal efficiency of the dual fuel engine are found to be affected when the EGR was used in the dual fuel engine.