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Öğe An experimental investigation of effect on diesel engine performance and exhaust emissions of addition at dual fuel mode of hydrogen(ELSEVIER, 2013) Kose, H.; Ciniviz, M.Internal combustion engines are an indispensable part of our daily life, especially in transportation and agriculture sectors. However, the reduction of petroleum resources and environmental problems are leading to an increasing trend towards alternative energy sources. In this regard, hydrogen usage is expected to be a solution for previously mentioned,problems as one of the renewable energy resources. In this concept, effects of hydrogen as an additional fuel used in a compression ignition engine performance and exhaust emissions parameters different engine speeds were investigated at full load. For this purpose, a compression ignition engine (CI) with 17/1 compression ratio, four cylinders, four stroke, turbocharger and 3.908 liters engine volume was used. While diesel fuel was injected directly to combustion chamber, hydrogen was added to inlet manifold at rates of 2.5%, 5% and 7.5% as volume. As a result, an increase in engine torque, power, thermal efficiency, nitrogen oxides (NOx) and exhaust gasses temperatures were acquired at every hydrogen addition ratio while a decrease in hydrocarbons (HC), carbon monoxide (CO) and oxygen (02) emissions were attained. While engine torque exhibited an increase at a rate of 8.3% comparing with standard diesel operation at 1250 min(-1) and 7.5% hydrogen addition ratio, engine power increased 17% at 2250 min(-1) engine speed and 7.5% hydrogen addition ratio. Brake thermal efficiency of 2.5% was obtained as 40.4% comparing with 33% value of SDI at 1750 min(-1). The lowest CO, CO2, HC and NOx emission values were obtained at 2250 min(-1) engine speed and 2.5% hydrogen addition ratio as 0.013; 2500 min(-1) engine speed and 7.5% hydrogen addition ratio as 7.4%; 1250 min(-1) engine speed and 2.5% hydrogen addition ratio as 10 ppm and 1000 min(-1) engine speed and 7.5% hydrogen addition ratio as 1092 ppm respectively comparing with standard diesel operation. (c) 2013 Elsevier B.V. All rights reserved.Öğe Impact of thermal barrier coating application on the performance and emissions of a turbocharged diesel engine(PROFESSIONAL ENGINEERING PUBLISHING LTD, 2008) Ciniviz, M.; Hasimoglu, C.; Sahin, F.; Salman, M. S.In this study, the effect of thermal-barrier-coated piston top and combustion chamber surfaces on turbocharged diesel engine performance was experimentally investigated. Satisfactory performance was obtained with TBC(1) (with coated cylinder head and valves) and TBC(2) (with coated cylinder head, piston top, and valves). Compared with a standard diesel engine, engine power was increased by 2 per cent, the engine torque was increased by 1.5-2.5 per cent, and brake specific fuel consumption (b.s.f.c.) was decreased by 4.5-9 per cent. The NO, emissions were increased by 10 per cent in diesel engines with TBC coatings compared with a standard diesel engine. Experimental studies have shown that there is a reduction in smoke emissions of up to 18 per cent as a result of TBC application.Öğe Investigation of engine performance and kit design for the usage of safflower oil as in diesel engine(PERGAMON-ELSEVIER SCIENCE LTD, 2019) Oğuz, H.; Öğüt, H.; Aydın, F.; Ciniviz, M.; Eryılmaz, T.In Turkey, the consumption of diesel oil is increasing both in transportation and in agricultural fields. In this study, the opportunities of the use of safflower oil, which grow originally in Turkey as a direct fuel in diesel engines, were researched to provide a new alternative for biofuel industry and to popularize the farming of oil crops. In this study, the kit design was completed first, and afterwards safflower oil was exposed to the process of neutralization and laundering, and then turned into standard fuel. For engine performance experiments, reference experiences were conducted by using diesel fuel by using safflower as a fuel in the engine with kit for 500 h; comparisons were made with regards to power, moment, diesel consumption, and exhaust emission. As a result, it was seen that when safflower was used as a fuel, there was a decrease in motor performance and emission, however specific fuel consumption increased. When safflower was used, there was not any residual on the engine that was found. The designed kit, which can be easily produced with national technology, did not cause any malfunction or negativity in the engine and it was successfully used. (C) 2019 Elsevier Ltd. All rights reserved.Öğe The investigation of the use of plant-based wild mustard and boron doped oil as engine lubrication oil in diesel engines(PERGAMON-ELSEVIER SCIENCE LTD, 2019) Öğüt, H.; Oğuz, H.; Aydın, F.; Ciniviz, M.; Deveci, H.In internal combustion engines, mineral engine oils which serve as lubricants between parts are not used alone due to technical reasons and various additives are made use of for better lubrication. In these additives, liquid boron serves to reduce friction. To reduce the environmental damage caused by engine lubrication oils, it is necessary to improve the properties of biological oils so that they can be used and compete with mineral oils technically. In the study, the use of liquid boron as an engine lubrication oil additive, together with wild mustard oil methyl ester, was investigated. Two diesel engines with the same characteristics were used. In the first engine, experiments were carried out using mineral lubrication oil, then the experiments were repeated using mineral oil with additives, and the results were compared for both situations. The study was conducted mainly in the fields of element analysis of endoscopic examination and lubricating oil (Al, Fe, Cu, Pb, Cr). As a result, it was found out that the engine in which mineral lubricating oil with boron and wild mustard oil methyl ester additive was used did not pose any risks in terms of wear and engine oil life, compared to the engine without additive lubricating oil. (C) 2019 Elsevier Ltd. All rights reserved.
