Faculty Publications
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Publications by NITK Faculty
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Item Performance and emission studies of a LPG fueled spark ignition engine with steam induction(Korean Society of Combustion, 2013) Shankar, K.S.; Mohanan, P.In this study the combustion and emission characteristics of a conventional naturally aspirated, four-cylinder, multipoint port fuel injection S.I engine modified to run with liquefied petroleum gas (LPG) injection along with steam induction are evaluated. Experiments are conducted at wide-open throttle condition and at a speed range of 2000 rpm to 4500 rpm with a static ignition timing of 6-degree bTDC. The steam flow rates of 10 to 25% of LPG flow rates (by mass) are used. The results with LPG and 25% steam induction at wide-open throttle condition and 3500 rpm indicates that the brake thermal efficiency has reduced by 2%, and the peak cylinder pressure has reduced by about 10 bar, with the location of the peak pressure being way from top dead centre when compared to LPG combustion. Oxides of nitrogen emission has reduced significantly with the induction of steam with a reduction of 45% when compared to LPG at 3500 rpm. The carbon monoxide and unburnt hydrocarbon emissions at the above condition have increased marginally. Thus the induction of steam along with LPG has resulted in notable reduction in the oxides of nitrogen emissions with a slight reduction in engine performance.Item Part load characteristics of a DI diesel engine achieving HCCI mode of combustion with air preheating(IAEME Publication, 2017) Sumanlal, M.R.; Kumar, S.N.; Mohanan, P.The study focuses on the effect of diesel vapour induction on the engine performance and to try and achieve Homogeneous Charge Compression Ignition (HCCI) mode of combustion in the engine. An existing Direct injection CI engine is modified to work as an HCCI engine by using a shell and tube heat exchanger which aids in the production of diesel vapour by utilising energy of exhaust gas. Different readings are taken for 50% and 75% load conditions. The effect of preheating of air is analysed by heating the inlet air by using a coil type heater. Preheating improved the brake thermal efficiency and brought down CO and HC emissions however it slightly increased NOx emissions. Induction of vapour was continued till the point where engine started to knock. Preheating of vapour was limited to 65°C due to continuous increase in NOx emissions. The best operating condition for each load was calculated and finally the optimum condition for the operation of HCCI engine was determined. © IAEME Publication.