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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 thermal aspects of hydrogen storage in a LaNi5-H2 reactor(2006) Kaplan Y.; Ilbas M.; Mat M.D.; Demiralp M.; Veziroglu T.N.In this work, hydrogen absorption in a LaNi5-H2 reactor is investigated experimentally and numerically. Experimental measurements were carried out on a cylindrical metal-hydride reactor filled with LaNi5 alloy. During the experiments hydrogen was charged at a constant pressure. The performance of the reactor during hydriding process was obtained at different fluid temperatures and hydriding process was identified from measured temperature histories. The temperature changes in the reactor were measured at several locations and recorded in a computer. The numerical simulation of the reactor was also performed. A two-dimensional mathematical model has been established and solved numerically by the method of finite volume for the simulation. The numerical results are compared with the measured data to validate the mathematical model. The predicted results are in good agreement with the experimental measurements. Copyright © 2005 John Wiley & Sons, Ltd.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.
