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    Biodiesel production from animal fat-palm oil blend and performance analysis of its effects on a single cylinder diesel engine
    (SILA SCIENCE, 2011) Sugozu, Ilker; Eryilmaz, Tanzer; Ors, Ilker; Solmaz, Ozgur
    Nowadays, the decrease in fossil based energy reserves and their negative impact on the environment have increased the interest in alternative energy sources. Vegetable oils and animal fats are used as alternatives of fuels that are used in diesel engines. High viscosity of vegetable oils and animal fats cause several problems in diesel engines. Methods such as dilution, pyrolysis, and transesterification are utilized to eliminate these problems. In this study, using transesterification method, biodiesel is produced from 30% animal fat 70% palm oil blend which has a substantial potential for being an alternative fuel for diesel engines. The impact of biodiesel on engine performance and exhaust emissions are investigated on a single cylinder, air cooled, pre-combustion chamber diesel engine. Engine performance values of biodiesel are obtained close to those values of diesel fuel. A decrease in CO emission and a slight increase in NO emission are observed. Following the experimental results, it is concluded that biodiesel produced from 30% animal fat and 70% palm oil could be used as an alternative fuel for diesel engine. Moreover, the positive impacts of biodiesel on environment in terms of exhaust emissions also increase its potential of being an alternative fuel.
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    Detailed Combustion Analysis of Gasohol at Low, Medium and High Loads in a Spark Ignition Engine
    (Selçuk Üniversitesi, 2021) Ors, Ilker; Kul, Bahar Sayin; Yelbey, Savas; Ciniviz, Murat
    In this study, detailed combustion analysis of gasoline and gasohol (90% gasoline + 10% bioethanol) as fuel at 2500 rpm engine speed, under 2 Nm, 3 Nm and 4 Nm engine loads was performed in a single cylinder, four stroke, air cooled spark ignition engine. According to the test results, it was determined that gasohol has a higher maximum in-cylinder pressure and heat release rate, the bioethanol in the gasohol increases the pressure rise rate, and gasohol has a higher knock density due to its lower compression ratio. However, it has been demonstrated that gasohol ignites earlier than gasoline and thus has a shorter ignition delay and a shorter combustion duration since it burns faster
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    EFFECT OF CETANE IMPROVER ADDITION INTO DIESEL FUEL Methanol Mixtures on Performance and Emissions at Different Injection Pressures
    (VINCA INST NUCLEAR SCI, 2017) Candan, Feyyaz; Ciniviz, Murat; Ors, Ilker
    In this study, methanol in ratios of 5-10-15% were incorporated into diesel fuel with the aim of reducing harmful exhaust gasses of Diesel engine, di-tertbutyl peroxide as cetane improver in a ratio of 1% was added into mixture fuels in order to reduce negative effects of methanol on engine pelformance parameters, and isobutanol of a ratio of 1% was used as additive for preventing phase separation of all mixtures: results of experiments conducted on a single cylinder and direct injection Diesel engine, methanol caused the increase of NOx emission while reducing CO, HC, CO2, and smoke opacity emissions. It also reduced torque and power values, and increased brake specific fuel consumption values. Cetane improver increased torque and power values slightly compared to methanol-mixed fuels, and reduced brake specific fuel consumption values. It also affected exhaust emission values positively, excluding smoke opacity. Increase of injector injection pressure affected performances of methanol-mixed fuels positively. It also increased injection pressure and NOx emissions, while reducing other exhaust emissions.
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    Experimental investigation of impact of addition of bioethanol in different biodiesels, on performance, combustion and emission characteristics
    (KOREAN SOC MECHANICAL ENGINEERS, 2017) Celik, Mehmet; Ors, Ilker; Bayindirli, Cihan; Demiralp, Mehmet
    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 (NOx) and smoke emissions were reduced.
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    PERFORMANCE, EMISSION, AND COMBUSTION ANALYSIS OF A COMPRESSION IGNITION ENGINE USING BIOFUEL BLENDS
    (VINCA INST NUCLEAR SCI, 2017) Ors, Ilker; Kahraman, Ali; Ciniviz, Murat
    This study aimed to investigate the effects on performance, emission, and combustion characteristics of adding biodiesel and bioethanol to diesel fuel. Diesel fuel and blend fuels were tested in a water-cooled compression ignition engine with direct injection. Test results showed that brake specific fuel consumption and volumetric efficiency increased by about 30.6% and 3.7%, respectively, with the addition of bioethanol to binary blend fuels. The results of the blend MI's combustion analysis were similar to the diesel fuel's results. Bioethanol increased maximal in-cylinder pressure compared to biodiesel and diesel fuel at both 1400 rpm and 2800 rpm. Emissions of CO increased by an amount of about 80% for fuels containing a high level of bioethanol when compared to CO emissions for diesel fuel. Using biodiesel, NO emissions increased by an average of 31.3%, HC emissions decreased by an average of 39.25%, and smoke opacity decreased by an average of 6.5% when compared with diesel fuel. In addition, when using bioethanol, NO emissions and smoke opacity decreased by 55% and 17% on average, respectively, and HC emissions increased by an average of 53% compared with diesel fuel.