Research
Effect of Compression Ratio and Exhaust Gas Recirculation (EGR) on Combustion, Emission and Performance of DI Diesel Engine with Biodiesel Blends
The present investigation deals with combustion, emission and performance characteristics of a single cylinder DI diesel engine for biodiesel blends (J10, J20, J30, P10, P20, P30) with the optimum use of EGR system by the formulation of matrix analysis. Compression ratios like 17.5:1, 19:1, 20:1 were varied. The piston was modified by cold metal transfer (CMT) welding with the use of aluminium alloy on the piston bowl of the diesel engine. Tests were performed at different loading conditions and results were obtained. The performance study suggests that BTE was found to be increased with J20 CR20 and slight reduction with J20 CR20 E20 blend compared to diesel. Peak pressure was higher for J20 CR20 conforming better combustion characteristics over other biodiesel blends. Ignition delay were shorter for J20 CR20 and P20 CR20 blends with crank angle varying from 23.4 deg to 10.78 deg for J20 CR20 and 23.4 deg to 10.48 deg for P20 CR20 before TDC. NOx emission was increased with the increase in percentage of biodiesel blends. Significant NOx reduction in biodiesel blends were found with the use of EGR in J20 CR20 EGR20 and P20 CR20 EGR20.
Study of Combustion and Performance Characteristics on a Single Cylinder DI Diesel Engine with Jatropha and Pongamia Methyl Ester Blends
Biodiesels are produced from various organic materials such as plants, fossils and bio wastes etc. The present work is a proposal for the study of combustion characteristics in a single cylinder DI diesel engine with a bio-fuel derived from Jatropha and Pongamia seed oil for supporting industrial aspects in India. Tests were conducted to study the engine characteristics such as heat release rate, peak pressure, ignition delay and brake thermal efficiency were studied for part load and rated load with different compression ratios 17.5:1, 19:1 and 20:1. Experimental results conclude that engine operating at a compression ratio 20:1 is found to be more effective with Jatropha and Pongamia blends. Combustion characteristics reveals maximum cylinder pressure occurs at PME20% as an optimal blend ratio. Ignition delay were reliable for shorter angle at 12.6° for PME20% blend. Performance characteristics suggests that brake thermal efficiency was increased for JME30% blend ratio.
