EFFECTS OF BIOHYDROGEN ON PREMIXED CHARGE COMPRESSION IGNITION ENGINE OPERATING AT VARIOUS INLET AIR TEMPERATURES

Abstract

The usage of the diesel engine has been increasing every year and simultaneously the emissions by the fossil fuels are mounting up and damaging the environment. Hence, it is of profound interest to seek the solution to reduce the emissions released by fossil fuels. In this proposed study, the biohydrogen influence on the diesel engine has been examined. Since biohydrogen is a green gas, it reduces the emissions of certain pollutants significantly. Hence, here the diesel engine is tested with 10% and 30% of biohydrogen flow through air intake. Two different combinations such as DH10 (10% Biohydrogen and 90% diesel) and DH30 (30% biohydrogen and 70% diesel) were tested at different mean effective pressure (MEP). The MEP has been varied from 1.05 bars to 4.2 bars. Since the engine is operating on premixed charge compression ignition conditions, inclusion of the biohydrogen is challenging. To avoid biohydrogen backfire flame arrestor has been attached between the cylinder and flowmeter. The crucial parameters such as brake thermal efficiency, brake specific fuel consumption, heat release rate, cylinder pressure, combustion timing, and emissions data were collected and analyzed to understand the sustainability of the biohydrogen gas running on the diesel engine. Based on findings it is clear, adding the biohydrogen gas to the engine increases the BTE and HRR. Further the cylinder pressure values were also increased due to the usage of compressed gas. Nevertheless, the brake specific fuel consumption has been at higher levels due to the energy discrepancy. With regards to the emission, CO, CO2 and NOx concentration in the exhaust tailpipe has decreased marginally, which is pleasing. Comparing DH10 and DH30, DH30 outperforms with regard to emission data. On the other hand, the performance values are superior for DH10 than DH30.