Faculty Publications
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Item Effect of 1-pentanol addition and EGR on the combustion, performance and emission characteristic of a CRDI diesel engine(Elsevier Ltd, 2020) Radheshyam; Santhosh, K.; Kumar, G.N.Experimental study of 1-pentanol addition and EGR rates on the combustion, performance and emission of a CRDI diesel engine is carried out in this work. 1-Pentanol being a higher alcohol has fuel properties comparable to diesel. Experiments were conducted on a 4 stroke two cylinder, CRDI diesel engine running at a constant speed of 2000 rpm for lower load and higher load. Test fuels were prepared by blending the 1-pentanol with diesel, and tests were carried out for 5%, 10%, 20%, 30% and 40%, 1-pentanol blended in diesel on a volume basis. Effect of EGR rates of 10% and 20% were also studied. It had observed that engine can be run up to 30% of 1-pentanol blended fuel without any engine modification, but with raise in the percentage of 1-pentanol in the blends, BSFC increases and BTE decreases. Combustion characteristic for blended fuel depends upon the load. At higher load due to premixed combustion MGT, CP and NHR were almost same compared to the diesel. Reduction in NOx emissions was noted for all the fuel blends at the cost of HC and CO emission. 1-pentanol is a renewable biofuel, with use of 1-pentanol the dependency on petrodiesel can be overcome. © 2019 Elsevier LtdItem Impact of 1-Hexanol/diesel blends on combustion, performance and emission characteristics of CRDI CI mini truck engine under the influence of EGR(Elsevier Ltd, 2020) Santhosh, K.; Kumar, G.N.Biofuels are the most promising sustainable and renewable alternative to diesel fuel. In the present renewable energy world, alcohols are gaining prime importance due to their nature of production and fuel properties. The present work aims to investigate the impact of 1-Hexanol and exhaust gas recirculation (10% and 20%) on engine characteristics of the common rail direct injection compression ignition engine. The experiment is carried out on a bench engine. The fraction of 1-Hexanol is varied from 10% to 40% in a step of 10% by volume. The results demonstrate that the use of 1-Hexanol/diesel blends lowers the cylinder pressure and mean gas temperature, which is 4.25% and 1.88% lower at 60% load for 40% 1-Hexanol compared to neat diesel fuel operation. The combustion duration is increased by 2.66?CA for 40% 1-Hexanol at 60% load compared to neat diesel fuel. However, an improvement in net heat release rate is noted which is 13.95% higher at 60% load for 40% 1-Hexanol, this increment is due to prolonged ignition delay. With the use of 1-Hexanol in the engine, there is a drastic reduction in nitrogen oxide emission is observed, this is the greatest impact of 1-Hexanol. However, a slight increment in the hydrocarbon and carbon monoxide emission is also noted due to poor fuel properties like lower cetane number, higher viscosity and higher latent heat of evaporation of 1-Hexanol. Compared to all other blends in the test 10% 1-Hexanol shows comparable results with pure diesel fuel, which is only 2.37% lower in brake thermal efficiency, 3.6% higher in brake specific fuel consumption, 17.55% lower in nitrogen oxide emission, 18.18% higher in hydrocarbon and 33.33% higher in carbon monoxide emission is noted. The exhaust gas recirculation helps in reducing the NOx emission, 40% 1-Hexanol is less sensitive to exhaust gas recirculation. Up to 40% of 1-Hexanol can be used in the CI engine without any modification. It is concluded that 1-Hexanol is a sustainable renewable biofuel due to the reason that even though the use of 1-Hexanol lowers the performance which helps in reducing the NOx emission greatly; the performance can be improved by modifying the engine parameters. © 2020 Elsevier LtdItem Effect of injection time on combustion, performance and emission characteristics of direct injection CI engine fuelled with equi-volume of 1-hexanol/diesel blends(Elsevier Ltd, 2021) Santhosh, K.; Kumar, G.N.In this experimental research work, the effect of 1-Hexanol on engine parameters is studied and to improve the combustion, performance and emission characteristics of CI engine, fuel injection time is advanced and retarded to know the best possible injection time. The experiment is conducted in a twin-cylinder, common rail direct injection diesel engine, speed (2000 rpm) of the engine is constant throughout the experiment and the engine load is varied as 20%, 40%, 60% and 80%. In this experiment equi-volume of 1-Hexanol/diesel blends is used as a fuel, the experiment is conducted for standard (12°BTDC), advanced (15°BTDC) and retard (9°BTDC) injection time. The obtained results are compared with baseline readings taken at standard injection time. The advanced injection time shows the best results compared to standard and retard injection time. The advanced injection time shows improved combustion parameters, the combustion peak moves near to TDC. An increment of 14.28% in BTE is noted for 1-Hexanol blend. The CO and HC emission decreases with advanced injection time, whereas higher NOx emission is noted. It is concluded that 50% of 1-Hexanol can be used in CI engine with slight modification in injection time; the advanced injection time gives improved efficiency. © 2020 Elsevier Ltd