Fuel, vol.312, 2022 (SCI-Expanded)
© 2021 Elsevier LtdThis study aims to examine and compare the effects of natural gas and propane addition to the combustion air of diesel engines on engine performance. Engine tests were carried out at four different loads, 25%, 50%, 75%, and 100%, at 1500 rpm and 2000 rpm. Natural gas and propane have been added separately to the combustion air and sent to the cylinders at 250 g/h and 500 g/h mass flow rates. The results obtained through measurements and calculations (cylinder pressure and temperature, fuel consumption and emissions) have been presented in detail. When the experimental results were examined, maximum pressure of approximately 59 bar was obtained using 500 g/h natural gas at 50% load and 1500 rpm. In terms of BSFC, the best results were obtained at 1500 rpm and full load, and by adding 250 g/h and 500 g/h natural gas to the combustion air, 20% and 21% reduction in BSFC was achieved, respectively, as compared to diesel fuel combusted alone. In the same conditions, by adding 250 g/h propane to the combustion air, approximately 15% reduction was achieved compared to diesel fuel. With the addition of 500 g/h propane at 1500 rpm and 25% load, a 57% reduction in NOx emission was achieved. A 56% reduction in NOx emission was observed with the addition of 500 g/h propane at the same load condition and 2000 rpm.