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Öğe Experimental investigation of impact of addition of bioethanol in different biodiesels, on performance, combustion and emission characteristics(Korean Society of Mechanical Engineers, 2017) Çelik M.; Örs İ.; Bayindirli C.; Demiralp M.This study includes the experimental evaluation of performance, combustion and emission characteristics of cottonseed and grapeseed biodiesels and blends containing bioethanol in a diesel engine with different engine speeds at full load. Addition of bioethanol into the fuels (diesel and biodiesel) used by diesel engines is considered an effective solution. The study observed that the cetane number, viscosity, density and lower heating value of fuel were reduced after the addition of bioethanol in all engine speeds. While the brake power and torque values were reduced as the rate of bioethanol increased, additionally specific fuel consumption, maximum cylinder pressure, heat release and ignition delay also increased. Reviewing the emission results, carbon monoxide (CO) and total hydrocarbon (THC) emissions increased as bioethanol rate increased, nitrogen oxides (NO x ) and smoke emissions were reduced. © 2017, The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature.Öğe Investigation of combustion and emission characteristics of n-hexane and n-hexadecane additives in diesel fuel(Korean Society of Mechanical Engineers, 2019) Bayindirli C.; Celik M.One of the most important basic requirements of diesel-powered vehicles that they have lower pollutant emissions and fuel consumption. In diesel engines, combustion and engine performance are influenced by the physical and chemical properties of the used fuel. Engine design studies are not enough to increase engine performance and reduce exhaust emissions alone. By adding fuel additives in diesel fuel, the physical and chemical properties of the fuel can be improved. Fuel additives affect engine performance, combustion and emissions positively by exerting catalyst effect during combustion. In this study, n-hexane and n-hexadecane were added in diesel fuel (D0) by volume of 4, 12 % and 20 %. With respect to D0 fuel, in DHD20 and DHX20 fuels engine torque increased by 1.60 % and 1.32 %, respectively, while the brake specific fuel consumption decreased by 3.12 % and 1.98 %, respectively. Maximum cylinder pressures and heat release rate values of the ingredient added fuels increased. It was seen that NO x emissions increased while HC, CO and soot emissions decreased with increasing contribution ratio. © 2019, KSME & Springer.Öğe The experimental and numerical drag minimization of a bus model by passive flow control method(Academic Publishing House, 2019) Bayindirli C.In this study, the drag coefficient of 1/33 scaled bus model were decreased by using passive flow control methods. The studies were conducted in wind tunnel and Computational Fluid Dynamics (CFD) method. The experimental tests were performed at 6 different free stream velocities (13.54 m/s-28.05 m/s), between the range of 3.8×105-7.9×105 Reynolds numbers. The drawing datas of bus model and flow control rod were obtained in SolidWorks program. Two different triangular flow control rods (D/H = 0.1 and 0.2) designed and mounted on the front of the bus model in the same L/H rates. The maximum drag reduction was obtained as 14.50% and 5.74% by using triangular structured flow control rod in wind tunnel. To determine detailed flow structure around bus model, CFD flow analyses were performed at the same wind tunnel conditions for base model bus and best result. Also the numerical flow analyses supports experimental results and drag reductions with 1-4% error margin. In this study, the maximum drag reduction was obtained as 14.50% in triangular flow control rod L/H: 0.15. This drag minimization decrease on fuel consumption is about 7% at the high vehicle speeds. © 2019, Academic Publishing House. All rights reserved.Öğe The investigation of the effects of washing process on biodiesel production to fuel properties and engine performance(2012) Celik M.; Bayindirli C.; Demiralp M.The major part of all energy consumed worldwide comes from fossil sources (petroleum, coal and natural gas). The search for alternative fuels, which promise a harmonious correlation with sustainable development, energy conservation, efficiency and environmental preservation, has become highly pronounced in the present context. One of the more promising approaches is the conversion of vegetable oils (VOs) and other feed stocks, which primarily contain triglycerides (TGs) and free fatty acids (FFAs), into biodiesel. Injection, atomization and combustion characteristics of vegetable oils are very different from those of diesel fuel. Experiments were made on single-cylinder, four-stroke, water-cooled, direct injection diesel engine. Crude biodiesel was produced utilizing refined cottonseed oil through the transesterification method. Crude biodiesel was subjected to wash with pure water (distilled water DW) and deionized water (DEW). At the end of this process biodiesel is obtained. The effect of the specifications of diesel fuel with these produced-biodiesels on engine performance has been observed. Result of the experiments prove that COME (DEW)fuel obtained by being washed with deionized water gives better performances than COME (DW) fuel obtained by being washed with distilled water on engine torque, effective power and specific fuel consumption respectively at the values as following %0.8, %0.75 and %0.81. © Sila Science.
