Yazar "Kahraman, N." seçeneğine göre listele

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    Energy and exergy analysis with emissions evaluation of a gasoline engine using different fuels
    (Elsevier Ltd, 2023) Akbıyık, Talip; Kahraman, N.; Taner, T.
    Petroleum-based fuels are used extensively as a result of the rising energy demands. Studies on fuels that will replace these fuels are now ongoing. In this study, performance, emission values of 4 different fuels at 4 different torque values were evaluated, and energy and exergy analyses were done utilizing combinations of gasoline, natural gas, and methanol. The tests employed a Lombardini LGW 523 2-cylinder 4-stroke engine. Four different fuels (gasoline, gasoline plus 50 g of natural gas, M20, and M20 plus 50 g of natural gas) were tested at a constant 3000 rpm with four different torque values (5, 10, 15, 20). In tests, it produced the lowest specific fuel consumption and the best emissions when combined with 50 g of natural gas fuel. The purpose of this study was to show that as torque increased, values for fuel, network, exhaust, absorption water, and energy destruction increased, while rates of lost energy decreased and rates of energy destruction increased.
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    Investigation of the effect of biofuel addition to jet fuel on engine performance and emissions in model jet engine
    (Institution of Chemical Engineers, 2024) Kuyucu, O.; Kahraman, N.; Çeper, B. Albayrak; Akbıyık, Talip
    The use of biofuel reinforced fossil fuels is increasing day by day, thanks to such as reducing the carcinogenic effects of fossil fuels and reducing the global warming effect. The unmanned aerial vehicle breakthrough made in our country, especially in the defense industry, will ensure that the use of smaller unmanned aerial vehicles becomes more widespread in the future, allowing us to reach more effective and economical solutions. In this study, biofuel was obtained from safflower oil, and the effect of adding various amounts of biofuel to kerosene in a model jet engine on engine performance, and emissions was examined. The closest results to kerosene in fuel consumption, thrust force and the use of biofuel to reinforce fossil fuels is increasing day by day. This is due to its ability to reduce the carcinogenic effects of fossil fuels and also to reduce the global warming effect. In Türkiye, especially in the defense industry, there has been a significant breakthrough in unmanned aerial vehicle technology. This breakthrough will ensure that the use of smaller unmanned aerial vehicles becomes more widespread in the future, allowing us to reach more effective and economical solutions. In this study, biofuel was produced from safflower oil. Researchers examined the effect of adding different amounts of biofuel into kerosene fuel in a model jet engine. Engine performance and emissions were analyzed in the study. When the specific fuel consumption of kerosene fuel is compared to the average of all cycles of other fuels, it is 5.6 % more than B10 fuel, 12.4 % more than B20 fuel and 15 % more than B30 fuel. 8.3 % less thrust force was obtained. The highest turbine inlet temperature values were obtained with Kerosene fuel. Similar results were obtained in terms of emissions, but the best results were obtained with Kerosene fuel. When the averages of the entire experiment with biodiesel blend fuels were compared, it was stated that it constituted an acceptable alternative fuel.
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    Investigation of the effect of boron additive to lubricating oil on engine performance, exhaust, and emissions
    (Elsevier Ltd, 2022) Akbıyık, Talip; Kahraman, N.; Taner, Tolga
    In this study, the effect of adding doped boron to lubricating oil on engine performance and emissions, in the cases of using gasoline and natural gas as fuel, was investigated in a spark ignition engine. The engine was initially run on a mixture of undoped boron lubricating oil, gasoline, and natural gas. Subsequently, engine performance and emission values were measured in the work, after the engine was run for 50 h. The same measurements were repeated for both the initial values and the values after 50 h with gasoline and natural gas by adding boron to the lubricating oil. Experimental results revealed that using boron-doped lubricating oil causes an average of 2.4–8% reduction in specific fuel consumption when using gasoline and natural gas as fuel in the engine. It was found that the use of boron in the lubricating oil did not make a significant change in C2, CO, and HC emissions, but caused a significant 11.4–12.9% reduction in NOX emissions. As a result, it was observed that adding boron-doped lubricating oil in a gasoline engine provides a relative improvement in engine performance and emissions.