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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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    Energy and Exergy Analyses of a Diesel Engine Fuelled with Biodiesel-Diesel Blends Containing 5% Bioethanol
    (MDPI AG, 2016) Kul, Bahar Sayin; Kahraman, Ali
    In this study, energy and exergy analysis were performed for a single cylinder, water-cooled diesel engine using biodiesel, diesel and bioethanol blends. Each experiment was performed at twelve different engine speeds between 1000 and 3000 rev/min at intervals of 200 rev/min for four different fuel blends. The fuel blends, prepared by mixing biodiesel and diesel in different proportions fuel with 5% bioethanol, are identified as D92B3E5 (92% diesel, 3% biodiesel and 5% bioethanol), D85B10E5 (85% diesel, 10% biodiesel and 5% bioethanol), D80B15E5(80% diesel, 15% biodiesel and 5% bioethanol) and D75B20E5 (75% diesel, 20% biodiesel and 5% bioethanol). The effect of blends on energy and exergy analysis was investigated for the different engine speeds and all the results were compared with effect of D100 reference fuel. The maximum thermal efficiencies obtained were 31.42% at 1500 rev/min for D100 and 31.42%, 28.68%, 28.1%, 28% and 27.18% at 1400 rev/min, respectively, for D92B3E5, D85B10E5, D80B15E5, D75B20E5. Maximum exergetic efficiencies were also obtained as 29.38%, 26.8%, 26.33%, 26.15% and 25.38%, respectively, for the abovementioned fuels. As a result of our analyses, it was determined that D100 fuel has a slightly higher thermal and exergetic efficiency than other fuel blends and all the results are quite close to each other.