Effects of novel intake manifold design and investigation of diesel engine operating on different alternative fuels

The present work focuses on performance improvement and emission reduction of conventional diesel engine's performance by incorporating various designs of intake manifolds while operating on different alternative fuels. The intake manifold was designed in a helical shape to produce higher turbulence in the combustion chamber. Three intake manifolds were designed while varying the internal diameter (ID) of helical shape, namely 1, 2 and 3 ID. In this study, the engine was operated on various alternative fuels, i.e., lemongrass oil, linseed oil and gas-to-liquid fuels. The improvement in performance and reduction in emission of the engine were highest for the engine connected with the 1-ID intake manifold. The gas-to-liquid fuel having the greater cetane number as output of the results is decreased the peak pressure. The oxides of nitrogen were significantly reduced by 51% for the engine connected with the 1-ID design manifold, and exhaust gas temperature also slightly decreased 24% when correlated with the diesel fuel. The presence of more oxygen content in the biodiesel used in the 1-ID manifold design shows the result in reduction of CO and HC by 35% and 46%, respectively, when correlated with the base fuel.