Assessment of hydrogen and diethyl ether enrichment on CI engine operating with binary blend of jatropha and camphor oil using response surface methodology

This paper aims to study the compression ignition dual fuel engine's characteristics operating with blends of jatropha and camphor oil along with hydrogen enrichment. The fuel blend was prepared by mixing 30 % Jatropha oil with 70 % Camphor oil on volume basics. Hydrogen gas was inducted in the air intake manifold at 4 and 8 LPM. Diethyl ether was added at 10 and 20 % to the binary blend of Jatropha oil and camphor oil at volume percentage to improve engine characteristics at 8 lpm. Matrix 1 was prepared using a central composite design for the input of load (50 %–100 %) and hydrogen induction up to 8 lpm. Matrix 2 was prepared for 8 lpm hydrogen induction by varying the diethyl ether concentration up to 20 %. The output response was analyzed using response surface methodology and a statistical model was found significant for the confidence level of 1 %. The experimental results show that the addition of 8 LPM of hydrogen in the air intake manifold has increased the brake thermal efficiency with maximum efficiency increment up to 33.7 % at 100 % load condition. Similarly, with hydrogen induction the maximum value for in-cylinder peak pressure (ICPmax), heat release rate (HRR), exergy efficiency (EE), and sustainability index (SI) are 76.5 Bar, 53.9 J/⸰CA, 43 % and 1.73 respectively. The reduction in emission of CO, smoke, HC and CO2 was noted with the penalty of NO emissions. Further, DEE addition by 20 % along with 8 LPM Hydrogen induction reduces the brake thermal efficiency significantly and a similar trend was noted with emissions such as CO, HC and NO and the smoke opacity. However, when 10 % DEE was added with 8 LPM of hydrogen there was an increase in BTE showing a maximum value of 34.2 %.