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Author: search.filters.author.Oommen, L.P.Subject: search.filters.subject.Exhaust gas recirculation

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    Experimental Studies on the Effect of Varying Rates of Part-Cooled EGR in High Pressure Loop on an MPFI Engine Under Variable Speed Operation
    (Springer Science and Business Media Deutschland GmbH info@springer-sbm.com, 2021) Oommen, L.P.; Kumar, G.N.
    Researches in automobile sector around the globe are focused on meeting the currently proposed emission norms. Exhaust gas recirculation is one pre-treatment technique that has been found effective in enhancing the combustion and emission characteristics of IC engines and regulating the emission of nitrogen oxides. The present work analyses the effect produced by different rates of partially cooled EGR in a high pressure loop on a multi-cylinder MPFI gasoline engine. Three flow rates of EGR—12%, 18% and 24%—have been studied, and the impact produced on thermal efficiency, specific fuel consumption and emission of macropollutants of the test engine has been analysed under variable speed operation in comparison with normal operation of the engine without recirculation. The temperature of recirculated exhaust gas is so maintained as not to have a negative influence on the fuel consumption characteristics. A reduction in specific fuel consumption is observed which results in a marginal improvement of brake thermal efficiency alongside the advantage obtained in the emissions of the engine. The study proves that the advantages of EGR addition are limited to around 18% above to which the cyclic variations and misfires become predominant, deteriorating the performance and emissions of the test engine. © 2021, Springer Nature Singapore Pte Ltd.
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    Experimental Analysis of Conjoint Effect of Semi-Cooled Exhaust Recirculation on Combustion of Liquid Phase Hydrocarbons Under Uniform Magnetic Fields
    (Institute for Ionics, 2022) Oommen, L.P.; Kumar, G.N.
    In the context of increasing the energy utilization of hastily depleting conventional hydrocarbon based fuels and regulating the associated emissions, the present experimental work investigates the conjoint effect of partially cooled exhaust gas recirculation on magnetic field-assisted combustion of gasoline in a multicylinder MPFI spark ignition engine. At the factory set ignition timing of 5 degree BTDC, an optimal mass of burnt gas (18%) within the tolerance limit of the engine determined through prior experiments is recirculated into the combustion chamber after partially cooling in a radiator assembly. The combustible charge which blends with the inert exhaust mixture is prepared from gasoline pretreated under a potent magnetic field generated using NdFeB rare earth magnets capable of enhancing the oxidation process. The intensity of applied magnetic field and the locus of magnetization are decided based on primal experiments. Combustion under the conjoint effect of the set modifications is studied in terms of fuel economy, thermal efficiency and regulated emissions of the engine in which significant improvement is noted. Cyclic variability in combustion is evaluated through the statistical analysis of COV of peak cylinder pressures and mean effective pressures which predicts reduction in probability of misfires. Experimental results portray an enhancement in fuel economy by 14.6% and reduction in cyclic variability by 11.56% under synergy of optimal recirculation and polarization when compared to baseline gasoline combustion and individual impact of recirculation of cooled exhaust gases. © 2022, King Fahd University of Petroleum & Minerals.