Faculty Publications

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Publications by NITK Faculty

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Author: search.filters.author.Mohanan, P.Subject: search.filters.subject.Nitrogen oxides

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    The experimental and simulation study of selective catalytic reduction system in a single cylinder diesel engine using NH3 as a reducing agent
    (Hindawi Publishing Corporation 410 Park Avenue, 15th Floor, 287 pmb New York NY 10022, 2014) Athrashalil Phaily, M.K.; Sreekumar, S.J.; Mohanan, P.
    Selective catalytic reduction (SCR) technology has been widely used in automotive applications in order to meet the stringent limits on emission standards. The maximum NOx conversion efficiency of an SCR depends on temperature and mass flow rate of an exhaust gas. In order to assess the suitability of Cordierite/Pt catalyst for low temperature application, an experimental work is carried out using single cylinder diesel engine for different load conditions by varying ammonia induction rate from 0.2 kg/hr to 0.8 kg/hr. The simulation is carried out using AVL FIRE for the validation of experimental results. From the study, it has been found that for 0.6 kg/hr ammonia induction rate the maximum conversion is achieved, whereas, for 0.8 kg/hr, conversion is reduced due to desorption of ammonia. Also it has been found that, at 75% of load, for all mass flow rates of ammonia the conversion was drastically reduced due to higher exhaust gas temperature and higher emission of unburnt hydrocarbons. More than 55% of NOx conversion was achieved using Cordierite/Pt catalyst at a temperature of 320°C. © 2014 Manoj Kumar Athrashalil Phaily et al.
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    Effect of oxygen enrichment on the performance, combustion, and emission of single cylinder stationary CI engine fueled with cardanol diesel blends
    (Korean Society of Mechanical Engineers, 2014) Dinesha, P.; Nayak, V.; Mohanan, P.
    We investigated the effect of intake air enrichment on the performance, combustion, and emission characteristics of a single cylinder direct-injection stationary diesel engine fueled with non- edible alternative fuel, namely, cardanol - diesel - methanol blend (B20M10). The results were compared with baseline diesel operations under standard operating conditions. The bio-fuel blend B20M10 (20% cardanol, 10% Methanol, and 70% diesel) was used as fuel and the combustion, performance, and emission characteristics were investigated by oxygen enriching of intake air with 3, 5, and 7 percentage by weight. With the increase of intake air oxygen concentration, CO, HC, and smoke were found to be decreased. But BTE and NOx emission were considerably increased. The blended fuel B20M10 with 7% oxygen enrichment of intake air was compared with diesel operation. The results show a 0.5% lesser BTE, 28% more NOx emission at full load condition. There is not much variation of smoke emission to be noticed for this fuel combination compared to diesel. © 2014 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.
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    Effect of oxygen enrichment of intake air on the performance and emission of single cylinder CI engine fueled with cardanol blends
    (Taylor and Francis Inc. 325 Chestnut St, Suite 800 Philadelphia PA 19106, 2015) Dinesha, P.; Mohanan, P.
    In this study, the effect of intake air enrichment on the performance and emission characteristics of a single-cylinder direct-injection diesel engine fueled with non edible oil namely Cardanol-diesel-methanol blend (B20M10) are investigated. With increase of intake air oxygen concentration, CO and HC decreased while brake thermal efficiency and NOx considerably increased. The maximum Brake Thermal Efficiency of 33.98% is obtained for B20M10 with 7% oxygen enrichment of intake air. Maximum NOx emission 20% is obtained for B20M10 with 7% oxygen enrichment for the full load condition. Decreases of 20% and 14.5% in CO emission are obtained for B20M10, over B20M10 with 7% oxygen enrichment, where as 76.8% and 74% decrease in hydrocarbon emission is obtained over B20M10 without oxygen enrichment.
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    Effect of varying 9-Octadecenoic acid (oleic fatty acid) content in biofuel on the performance and emission of a compression ignition engine at varying compression ratio
    (Taylor and Francis Ltd. michael.wagreich@univie.ac.at, 2018) Dinesha, P.; Jagannath, K.; Mohanan, P.
    The 9-Octadecenoic acid (oleic fatty acid) content of vegetable oil seeds can be altered by mutagenesis, thereby increasing its content in the oil, for the purpose of increasing shelf life. In this work, the effect of varying the oleic acid content in ester on the performance and emission of a CI engine was examined. For this purpose, the situation was simulated by adding commercially available 9-Octadecenoic acid to pongamia ester; in terms of different percentages, the experiments were conducted with 10% and 20% extra oleic acid, at 16, 17, 17.5 and 18 compression ratio (CR). The results indicate that the smoke emission and BSEC increase with increase in oleic acid content, whereas the BTE and NOx decrease with increased proportions of oleic acid for all CRs. Pongamia methyl ester with 10% extra oleic acid at 17 CR results in lower NOx when compared to neat pongamia methyl ester at a normal CR of 17.5. Smoke emission increases with extra oleic acid content for all CRs; however, it is minimum at 17 CR for 10% extra oleic acid. From the research it is concluded that pongamia methyl ester with 10% extra oleic acid at 17 CR results in better performance and emission. © 2017 Informa UK Limited, trading as Taylor & Francis Group.
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    Cycle by cycle variations of LPG-gasoline dual fuel on a multi-cylinder MPFI gasoline engine
    (Taylor and Francis Ltd. michael.wagreich@univie.ac.at, 2018) Vighnesha, N.; Shankar, K.S.; Dinesha, P.; Mohanan, P.
    Combustion stability of a multipoint port fuel injection spark ignition engine working on liquefied petroleum gas (LPG)-gasoline dual fuel mode of operation was analysed. LPG-gasoline ratio was varied from 0 to 100% by controlling the injector signals at wide open throttle condition and 3000 RPM. Increasing LPG ratio will give higher peak pressure and higher indicated mean effective pressure (IMEP) because of the higher flame propagation speed of LPG. The experiment showed that maximum pressure will occur nearer to top dead centre when compared to gasoline. Fluctuation in maximum pressure is higher for LPG and is minimum for 50% LPG. Time return map showed that combustion instabilibity will be more for 100% LPG and is less for 50% LPG. Coefficient of variation of IMEP and maximum pressure for gasoline is higher than LPG. With 100% LPG, NOx emission is almost three times that of gasoline. Hence it can be concluded that 50% LPG will give the better combustion characteristics when compared to other fuel blends. © 2017, © 2017 Informa UK Limited, trading as Taylor & Francis Group.