Performance and Emission on Raw Vegetable Oil with Hydrogen-Enriched Air for Better Combustion in a DICI Engine

The rapid growth of the society is based on transportation. The global economy hugely depends on surface transports, such as road transport, rail and marine. Diesel engines are the main power source for the transport. There is a huge demand for fossil fuel and strict norms on pollution also compel the researchers to probe in for discovering alternate fuels. Present work investigates the use of high viscous raw vegetable oil, Simarouba glauca (SG oil) oil, in a DICI engine with hydrogen as combustion enhancer. The hydrogen gas is generated by hydrolysis of water and stored in a cylinder. The hydrogen gas is passed by inducting into inlet manifold. Neat vegetable oil was added through high-pressure fuel injection pump and hydrogen was inducted through inlet manifold. The inducted high-energy gaseous fuel was flashed by the intermediate breakdown products of neat oil. It creates a higher temperature ambiance to complete the combustion of bulky molecules of high viscous non-edible oil within a short span of time. The result of the experimentation reveals that the use of H₂ certainly enhanced the combustion behavior of neat vegetable oil. In addition, 5% higher brake thermal efficiency, 6% higher EGT, 17% lower smoke, 5% lower CO can be observed from the result. The NO_x emission was higher by 17% due to hydrogen inclusion, and 33% reduction in HC emission than diesel. The significance of the investigation reveals that a notable development has been achieved in combustion performance and emission.