Person: SAYIN, CENK
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SAYIN
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CENK
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Publication Open Access Effects of supercharge pressure on combustion characteristics of a diesel rngine fueled with alcohol–diesel blends(2023-01-01) SAYIN, CENK; Vargün M., Özsezen A. N., Türkcan A., Sayın C., Kılıçaslan İ.© 2023, King Fahd University of Petroleum & Minerals.The recent increase in diesel prices is the most crucial factor that maintains alternative fuel research on the agenda in diesel engines. This study aims to analyze the combustion characteristics of ethanol–butanol–diesel triple-fuel mixtures and to investigate the effects of the boost pressure in a single-cylinder diesel engine. In the engine test, while the boost pressure at 1600 rpm was fixed at 240 mbar, the intake air pressure gauge was increased to 264, 228, and 312 mbar. As a result of the study, the most prolonged combustion duration in all test conditions was obtained using pure fossil diesel fuel. More than a 10% increase in ignition delay times has been calculated for blends. In addition, significant increases were observed in the heat release rate as the alcohol content in the blends increased. While considerable reductions in CH4, CO, and CO2 emissions were monitored by using the alcohol–diesel mixtures with the increased boost pressure, the stable formation in NOx emissions was not observed. Moreover, there was a significant increase in combustion noise with alcohol–diesel blends.Publication Metadata only Effect of nheptane/isopropanol/butanol/diesel blends on exhaust emissions in a commonrail diesel engine(2022-07-08) SAYIN, CENK; VARGÜN, MUSTAFA; YILMAZ, İLKER TURGUT; Vargün M., Yapmaz A., Yılmaz İ. T., Sayın C.Publication Metadata only Yakıtlar ve yanma(Nobel Akademik Yayıncılık, 2021-01-01) SAYIN, CENK; SAYIN C., BALKİ M. K., ERDOĞAN S.Publication Metadata only Biyokütle(Nobel Yayınevi, 2022-01-01) SAYIN, CENK; SAYIN C., BALKİ M. K., YILMAZ O.Publication Metadata only The determination of the best operating parameters for a small SI engine fueled with methanol gasoline blends(ELSEVIER, 2021) SAYIN, CENK; Balki, Mustafa Kemal; Temur, Mustafa; Erdogan, Sinan; Sarikaya, Murat; Sayin, CenkIt is extremely important to ensure a clean and sustainable energy supply due to the decreasing fossil energy resources, their increasing costs and irreversible damages on the ecological balance. Considering this situation, this study focuses on the determination of the best operating parameters for a small spark ignition (SI) engine fueled with methanol/gasoline blend (M5, M10, M15 and M20). Moreover, operating conditions are optimized according to different weights between performance and emission. In the first stage of the study, engine tests were carried out at different loads (10 and 20 Nm) and compression ratios (CR) (7:1, 8:1 and 9:1) and the changes in engine performance and exhaust emissions were presented. In addition, these experimental results were used in optimization. According to the engine test results, performance and emissions of small SI engine were generally improved with increasing the methanol ratio in the blend fuels under all experimental conditions. When exhaust emissions were evaluated, it was observed that M20 was more favorable than gasoline if it was used in CR of 9:1 in a small SI engine. In the second stage of the study, the effect of experimental variables on the experimental results was statistically investigated with analysis of variance (ANOVA). The results of ANOVA analysis showed that all experimental variables were statistically significant for both engine performance and exhaust emissions. In the last stage of the study, the operating conditions of the engine were optimized according to eleven different weight ratios between performance and emissions, with a multi-criteria decision-making method based on grey relational analysis (GRA). According to the optimization results, the most suitable operating parameters were presented to the readers with regard to the desired weight ratio in engine performance and exhaust emission. The presented optimization model can be used for the design of electronic fuel systems for alternative fuel engines. Moreover, suitable engine parameters determined according to the selected weight ratio can also be adjusted structurally in the engine.Publication Metadata only Evaluation of the effects of pilot fuel injection ratio on combustion products in a diesel engine using ethanol/diesel mixtures(2022-07-02) VARGÜN, MUSTAFA; SAYIN, CENK; Vargün M., Özsezen A. N., Sayın C.Publication Metadata only The optimization of engine operating parameters via SWARA and ARAS hybrid method in a small SI engine using alternative fuels(ELSEVIER SCI LTD, 2020) SAYIN, CENK; Balki, Mustafa Kemal; Erdogan, Sinan; Aydin, Selman; Sayin, CenkIn most countries, mandatory emission norms have been established to reduce greenhouse gas emissions. In addition, the production and use of diesel engines with high emissions have been prohibited in some countries. For this reason, spark ignition (SI) engines have become important. Research on the use of renewable energy sources and the development of energy-efficient engines is increasing in terms of sustainability. It is known that alcohol fuels with high knock resistance than gasoline generate higher engine efficiency under different engine operating conditions. In this study, it is determined that the optimum operating parameters of an SI engine fueled with pure ethanol and methanol as an alternative fuel in terms of performance, emission and combustion characteristics. The engine tests were used an air-cooled and single-cylinder small SI engine. The engine has been set to three different ignition timing/advance (IT), compression ratio (CR) and air excess coefficient (AEC), and tested in varied combinations. In a total of eighty-one different test conditions, the engine was operated at the full-throttle opening and at engine speed at 2400 rpm with test fuels, and then performance emission and combustion data were obtained. The optimal operating parameters are determined with a multi-criteria decision-making method (MCDM) using a total of seven hundred twenty-nine experimental data. For this purpose, SWARA-ARAS (Step-wise Weight Assessment Ratio Analysis-Additive Ratio Assessment) hybrid method is preferred. According to the results, the optimum working parameters were found to be 9.0:1 of CR, 1.1 of AEC, and 20 degrees crankshaft angle (CA) of IT in the use of pure methanol fuel. In addition, the top ten rankings entering the operating parameters are presented in the article. (C) 2020 Elsevier Ltd. All rights reserved.Publication Metadata only An evaluation of the use of alcohol fuels in SI engines in terms of performance, emission and combustion characteristics: A review(ELSEVIER SCI LTD, 2021) SAYIN, CENK; Goktas, Meltem; Balki, Mustafa Kemal; Sayin, Cenk; Canakci, MustafaVehicles powered by fossil-fuels cause to increase harmful gases in the environment and decrease petroleum reserves. To minimize these damages, many researchers submitted that one of the alternative fuels which could obtain desired performance and release minimum rates of exhaust emissions in spark-ignition (SI) engines is alcohol fuel, and they carried out many experimental studies. In this review study, experimental studies which indicate the changes in performance parameters, emissions such as hydrocarbon (HC), carbon monoxide (CO), carbon dioxide (CO2) and nitrogen oxide (NOx), and combustion characteristics by using alcohol fuel in SI engines were investigated in detail and the increments and decrements in related parameters were indicated in separated tables. In addition, the graphs which indicate how much alteration obtained by using what kind of alcohol and what amount of alcohol in comparison with using gasoline were created.Publication Open Access Investigation of performance, combustion and emission characteristics in a diesel engine fueled with methanol/ethanol/nHeptane/diesel blends(2022-10-01) VARGÜN, MUSTAFA; SAYIN, CENK; YILMAZ, İLKER TURGUT; Vargün M., Yılmaz İ. T., Sayın C.One of the important reasons of exhaust emissions harmful to the environment and human health is the use of fossil fuels in internal combustion engines as energy resources. In this study, in order to research for cleaner fuel resources and to reduce dependence on fossil fuels, 20% methanol, ethanol and n-heptane fuels added by volume to fossil-based diesel fuel. The effects on engine performance, combustion and exhaust emission characteristics were investigated in a diesel engine with a 4-cylinder common rail injection system, at different engine loads (40 Nm and 80 Nm) and different engine speeds (1500 rpm, 1600 rpm, 1700 rpm and 1800 rpm). The maximum brake thermal efficiency (BTE) value was obtained as 43% with diesel-methanol (M20) mixed fuel at 1800 rpm at 80 Nm engine load. Brake specific fuel consumption (BSFC) values improved in all fuel types with the increase in engine load. In all test conditions, the highest maximum cylinder gas pressure (CPmax) value was obtained with M20 fuel as 114.3 bar, while the highest cumulative heat release (CHRmax) value was determined as 811.7 J with diesel-nheptane (H20) fuel. Compared to diesel fuel (D100), the use of alcohol-diesel fuel mixtures resulted in longer ignition delay (ID) and shortened combustion duration (CD). In general, a significant reduction in carbon dioxide (CO2) emissions has been observed with the use of blended fuels. As a result of the increase in engine the load, a decrease in HC emissions was observed for all test fuels. When compared to D100 fuel, oxygen (O-2) and nitrogen oxide (NO) emissions were increased with the use of diesel-methanol (M20) and diesel-ethanol (E20) fuels, while O-2\ and NO emissions were decreased with the use of diesel-nheptane fuel. (C) 2022 Elsevier Ltd. All rights reserved.Publication Metadata only Evaluation of combustion characteristics in a common rail diesel enginefueled butanol/nheptane/diesel blends(2022-04-09) SAYIN, CENK; VARGÜN, MUSTAFA; YILMAZ, İLKER TURGUT; VARGÜN M., Yapmaz A., YILMAZ İ. T., SAYIN C.