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 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 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.Publication Metadata only Impact of thermal barrier coating application on the combustion, performance and emissions of a diesel engine fueled with waste cooking oil biodiesel-diesel blends(ELSEVIER SCI LTD, 2014) SAYIN, CENK; Aydin, Selman; Sayin, CenkBiodiesel fuel was produced from waste cooking oil by transesterification process. B20 and B50 blends of biodiesel-petroleum diesel were prepared. These blends and D2 fuels were tested in a single cylinder CI engine. Performance, combustion and emission values of the engine running with the mentioned fuels were recorded. Then the piston and both exhaust and intake valves of the test engine were coated with layers of ceramic materials. The mentioned parts were coated with 100 mu m of NiCrAl as lining layer. Later the same parts were coated with 400 mu m material of coating that was the mixture of 88% of ZrO2, 4% of MgO and 8% of Al2O3. After the engine coating process, the same fuels were tested in the coated engine at the same operation condition. Finally, the same engine out parameters were obtained and compared with those of uncoated engine parameters in order to find out how this modification would change the combustion, performance and emission parameters. Results showed that the modification of the engine with coating process resulted in better performance, especially in considerably lower brake specific fuel consumption (Bsfc) values. Besides, emissions of the engine were lowered both through coating process and biodiesel usage excluding the nitrogen oxides (NOx) emission. In addition, the results of the coated engine are better than the uncoated one in terms of cylinder gas pressure, heat release rate (HRR) and heat release (HR). (C) 2014 Elsevier Ltd. All rights reserved.Publication Metadata only Influence of injector hole number on the performance and emissions of a DI diesel engine fueled with biodiesel-diesel fuel blends(PERGAMON-ELSEVIER SCIENCE LTD, 2013) SAYIN, CENK; Sayin, Cenk; Gumus, Metin; Canakci, MustafaIn diesel engines, fuel atomization process strongly affects the combustion and emissions. Injector hole number (INHN) particular influence on the performance and emissions because both parameters take important influence on the spray parameters like droplet size and penetration length and thus on the combustion process. Therefore, the INHN effects on the performance and emissions of a diesel engine using biodiesel and its blends were experimentally investigated by running the engine at four different engine loads in terms of brake mean effective pressure (BMEP) (12.5, 25, 37.5 and, 50 kPa). The injector nozzle hole size and number included 340 x 2 (340 mu m diameter holes with 2 holes in the nozzle), 240 x 4, 200 x 6, and 170 x 8. The results verified that the brake specific fuel consumption (BSFC), carbon dioxide (CO2) and nitrogen oxides (NOx) emission increased, smoke opacity (SO), hydrocarbon (HC) and carbon monoxide (CO) emissions reduced due to the fuel properties and combustion characteristics of biodiesel. However, the increased INHN caused a decrease in BSFC at the use of high percentage biodiesel diesel blends (B50 and B100), SO and the emissions of CO, HC. The emissions of CO2 and NOx increased. Compared to the original (ORG) INHN, changing the INHN caused an increase in BSFC values for diesel fuel and low percentage biodiesel-diesel blends (B5 and B20). (C) 2013 Elsevier Ltd. All rights reserved.