Person: SAYIN, CENK
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SAYIN
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CENK
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Publication Metadata only The impact of varying spark timing at different octane numbers on the performance and emission characteristics in a gasoline engine(ELSEVIER SCI LTD, 2012) SAYIN, CENK; Sayin, CenkThe performance and emissions of gasoline engine using different research octane number (RON) gasolines (91, 93, 95 97, and 98 RON) at varying spark timing (ST) has been presented in this paper. For this work, a single cylinder, four stroke, naturally aspirated spark ignition engine requiring gasoline fuel with 95 RON was used. The original (ORG) ST of the engine is 23 degrees CA BTDC. The tests were conducted for three different STs (20 degrees CA BTDC, 23 degrees CA BTDC, and 26 degrees CA BTDC) by varying cam positions mechanically. Results showed that using RONs higher than the requirement of an engine not only decreased brake thermal efficiency (BTE) but also increased brake specific fuel consumption (BSFC), the emissions of carbon monoxide (CO) and hydrocarbon (HC) at ORG ST. On the other hand, with the increased ST (26 degrees CA BTDC); BSFC, the emissions of HC and CO decreased, and BTE boosted for higher RON. (C) 2012 Elsevier Ltd. All rights reserved.Publication Metadata only Impact of compression ratio and injection parameters on the performance and emissions of a DI diesel engine fueled with biodiesel-blended diesel fuel(PERGAMON-ELSEVIER SCIENCE LTD, 2011) SAYIN, CENK; Sayin, Cenk; Gumus, MetinThis work investigates the influence of compression ratio (CR) and injection parameters such injection timing (IT) and injection pressure (IP) on the performance and emissions of a DI diesel engine using biodiesel (%5, 20%, 50%, and 100%) blended-diesel fuel. Tests were carried out using three different CRs (17, 18, and 19/1), ITs (15 degrees, 20 degrees, and 25 degrees CA BTDC) and IPs (18, 20 and 22 MPa) at 20 N m engine load and 2200 rpm. The results showed that brake specific fuel consumption (BSFC), brake specific energy consumption (BSEC), and nitrogen oxides (NOx) emissions increased while brake thermal efficiency (BTE), smoke opacity (OP), carbon monoxide (CO) and hydrocarbon (HC) decreased with the increase in the amount of biodiesel in the fuel mixture. The best results for BSFC, BSEC and BTE were observed at increased the CR, IP, and original IT. For the all tested fuels, an increase in IP, IT and CR leaded to decrease in the OP. CO and MC emissions while NO emissions increase. (C) 2011 Elsevier Ltd. All rights reserved.Publication Metadata only Performance and combustion characteristics of a DI diesel engine fueled with waste palm oil and canola oil methyl esters(ELSEVIER SCI LTD, 2009) SAYIN, CENK; Ozsezen, Ahmet Necati; Canakci, Mustafa; Turkcan, Ali; Sayin, CenkThis study discusses the performance and combustion characteristics of a direct injection (DI) diesel engine fueled with biodiesels such as waste (frying) palm oil methyl ester (WPOME) and canola oil methyl ester (COME). In order to determine the performance and combustion characteristics, the experiments were conducted at the constant engine speed mode (1500 rpm) under the full load condition of the engine. The results indicated that when the test engine was fueled with WPOME or COME, the engine performance slightly weakened; the combustion characteristics slightly changed when compared to petroleum based diesel fuel (PBDF). The biodiesels caused reductions in carbon monoxide (CO), unburned hydrocarbon (HC) emissions and smoke opacity, but they caused to increases in nitrogen oxides (NOx) emissions. (C) 2008 Elsevier Ltd. All rights reserved.Publication Metadata only Effect of Injection Pressure on the Combustion, Performance, and Emission Characteristics of a Diesel Engine Fueled with Methanol-blended Diesel Fuel(AMER CHEMICAL SOC, 2009) SAYIN, CENK; Canakci, Mustafa; Sayin, Cenk; Ozsezen, Ahmet Necati; Turkcan, AliIn this study, the effect of injection pressure on the engine performance, exhaust emissions and combustion characteristics of a single cylinder, four stroke, direct injection, naturally aspirated diesel engine has been experimentally investigated when using methanol-blended diesel fuel from 0 to 15% with an increment of 5%. The engine has original injection pressure of 200 bar. The tests were conducted at three different injection pressures (180, 200, and 220 bar) with decreasing or increasing washer number. All tests were conducted at four different loads (5, 10, 15, and 20 N m) for constant engine speed of 2200 rpm. The experimental test results proved that brake thermal efficiency, heat release rate, peak cylinder pressure, smoke number, carbon monoxide and unburned hydrocarbon emissions reduced as brake-specific fuel consumption, brake specific energy consumption, combustion efficiency, and nitrogen oxides and carbon dioxide emissions increased with increasing amount of methanol in the fuel blend. When comparing the results to the original injection pressure, at the decreased injection pressure (180 bar), peak cylinder pressure, rate of heat release, combustion efficiency, and nitrogen oxides and carbon dioxide emissions decreased, whereas smoke number, unburned hydrocarbon, and carbon monoxide emissions increased at all test conditions. On the other hand, with the increased injection pressure (220 bar), smoke number, unburned hydrocarbon, and carbon monoxide emissions diminished, and peak cylinder pressure, heat release rate, combustion efficiency, and nitrogen oxides and carbon dioxide emissions boosted at all test conditions. With respect to brake-specific fuel consumption, brake-specific energy consumption, and brake thermal efficiency, changing injection pressure gave negative results in the all fuel blends compared to the original injection pressure.Publication Open Access Selection of the Most Suitable Alternative Fuel Depending on the Fuel Characteristics and Price by the Hybrid MCDM Method(MDPI, 2018-05-15) SAYIN, CENK; Erdogan, Sinan; Sayin, CenkIn recent years, in order to increase the quality of life of people, energy usage has become very important. Researchers are constantly searching for new sources of energy due to increased energy demand. Engine tests are being conducted to investigate the feasibility of the new sources of energy such as alternative fuels. In the engine tests, engine performance, combustion characteristics and exhaust emissions are evaluated by obtaining the results. The effect of newly developed fuels on engine lifetime, safe transport and storage are also examined for fuel availability. In addition, the potential and the price of fuels are important in terms of sustainability. In these studies, laboratory environments are needed for experimental setups. It is difficult to determine the availability of the most suitable alternative fuel since numerous results are obtained in the engine tests and studies. This integrated model provides a great advantage in terms of time and cost. The physical and chemical properties of the fuel affect experimental results such as engine performance, combustion, and exhaust emission. The suggested model can be making the most efficient and eco-friendly fuel choice without the need for experimental studies by using physical and chemical properties of the fuel. It also can offer the best fuel for cost, safety and maintenance processes. In this study, animal fat biodiesel derived from waste animal fats and vegetable oil biodiesel produced from aspir-canola oils were investigated. Biodiesel fuels are mixed with diesel at 5%, 20%, and 50%, and nine different fuels prepared with three pure fuels, and six different fuel blends are compared. Before using these fuels in an experimental study, estimates are made about which fuels may be more advantageous in terms of many criteria. In the process, nine varied fuel specifications are taken as references such as calorific value, cetane number, oxygen content rate, fuel price, flash point, viscosity, lubricity, iodine number and water content. The criteria weights are determined with SWARA (Step-Wise Weight Assessment Ratio Analysis) from multi-criteria decision-making models, and MULTIMOORA (Multi-Objective Optimization on the basis of Ratio Analysis) is ranked according to fuels' characteristics from the best to the worst. While theoretically, the best fuel is ultimately VOB20, VOB50 and AFB20 were selected as the second fuel and the third fuel.Publication Metadata only The best fuel selection with hybrid multiple-criteria decision making approaches in a CI engine fueled with their blends and pure biodiesels produced from different sources(PERGAMON-ELSEVIER SCIENCE LTD, 2019) SAYIN, CENK; Erdogan, Sinan; Balki, Mustafa Kemal; Aydin, Selman; Sayin, CenkIn engine tests where the feasibility of alternative fuels is being investigated, the results of the engine performance, combustion characteristics, and exhaust emissions should be considered as a whole. It is difficult to determine the optimal parameters due to a large number of results obtained in multi-variable experiments. Multi-criteria decision making (MCDM) methods are preferred in solving such problems to energy management and energy efficiency. This paper deals with an application of a novel hybrid MCDM technique is suggested to select the optimum fuel for the compression ignition (CI). Five academicians who are an expert in the field of CI engines are selected to set criteria in the MCDM. Engine tests carried out at the constant engine speed and the resistive load of 10.8 kW in the generator-engine set. The results were used in the MCDM process. In this study, the hybrid models which are SWARA-MOORA, and ANP-MOORA has been preferred as the MCDM methods. The best fuel choice was made from fuels such as animal fat biodiesel (AFB), vegetable oil biodiesel (VOB), diesel fuel and the blend fuels. According to results, it was determined that the best fuel is VOB20 in both hybrid methods according to the determined criteria. (C) 2018 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 Metadata only The effect of compression ratio on the performance, emissions and combustion of an SI (spark ignition) engine fueled with pure ethanol, methanol and unleaded gasoline(PERGAMON-ELSEVIER SCIENCE LTD, 2014) SAYIN, CENK; Balki, Mustafa Kemal; Sayin, CenkIn this study, the effect of CR (compression ratio) on a SI (spark ignition) engine's characteristics of performance, combustion and emissions by using pure ethanol, methanol and unleaded gasoline were investigated experimentally. In the experiments, an SI engine having a CR of 8.5:1, having a single cylinder and air-cooled was used. These tests were conducted on four different CRs of 8.0:1, 8.5:1,9.0:1 and 9.5:1 with a wide-open throttle, original ignition timing and at 2400 rpm. The test results obtained from the three fuel types were compared to each other. The results were shown that the BMEP (brake mean effective pressure), CGP (cylinder gas pressure), BTE (brake thermal efficiency), and BSFC (brake specific fuel consumption) obtained with the use of ethanol and methanol at all CRs were generally increased when they were compared to those of pure gasoline. In general, pure ethanol and methanol provided a lower exhaust emission compared to gasoline's emissions at all CRs. Furthermore, with an increasing CR, the CGP generally increased with the usage of pure ethanol and methanol as compared to unleaded gasoline's study and the CGP and HRR(heat release rate) rose earlier than those values in unleaded gasoline. (C) 2014 Elsevier Ltd. All rights reserved.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 The effect of different alcohol fuels on the performance, emission and combustion characteristics of a gasoline engine(ELSEVIER SCI LTD, 2014) SAYIN, CENK; Balki, Mustafa Kemal; Sayin, Cenk; Canakci, MustafaIn this experimental study, the effect of alcohol (ethanol and methanol) use on the performance, emissions and combustion characteristics of a low power single-cylinder engine described the rated power output of the engine e. g. 2 kW were investigated and the results were compared with conventional gasoline operation. The tests were performed at full-throttle valve opening and variable engine speeds. The results show that the use of alcohol fuels increased the engine torque, brake specific fuel consumption (BSFC), thermal efficiency and combustion efficiency. In addition, the cylinder gas pressure and heat release rate occurred earlier; carbon dioxide (CO2) emission increased while hydrocarbon (HC), carbon monoxide (CO) and nitrogen oxides (NOx) emissions decreased. (C) 2012 Elsevier Ltd. All rights reserved.