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SAYIN, CENK

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Now showing 1 - 10 of 22
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    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, Cenk
    The 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.
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    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, Metin
    This 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.
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    Optimization of the operating parameters based on Taguchi method in an SI engine used pure gasoline, ethanol and methanol
    (ELSEVIER SCI LTD, 2016) SAYIN, CENK; Balki, Mustafa Kemal; Sayin, Cenk; Sarikaya, Murat
    In this study, Taguchi's design of experiment method and analysis of variance (ANOVA) were applied in order to find optimum operating parameters giving the best engine performance and exhaust emissions with a minimum number of the engine tests in a spark ignition (SI) engine fueled with pure gasoline, ethanol and methanol. For this purpose, the test engine was operated under different compression ratio (CR), engine speed and ignition timing (IT). In addition, the engine performance and regular brake specific exhaust emission values obtained from an optimized engine were compared to those of the baseline engine. According to result, the optimum CR and engine speed value are found to be 9.0 and 2400 rpm for all fuels. While the optimum IT is also 20 degrees crank angle (CA) for alcohol fuels, it is 26 degrees CA in gasoline. As a result of verification experiment, optimization made by reducing (to about 89%) test number with help of Taguchi was achieved within 95% confidence interval. On the other hand, the engine performance and regular brake specific exhaust emission results obtained from optimized engines generally have improved when compared to those of the baseline engine. (C) 2016 Elsevier Ltd. All rights reserved.
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    Effect of compression ratio on the emission, performance and combustion characteristics of a gasoline engine fueled with iso-butanol/gasoline blends
    (PERGAMON-ELSEVIER SCIENCE LTD, 2015) SAYIN, CENK; Sayin, Cenk; Balki, Mustafa Kemal
    The study focuses on the effect of CR (compression ratio) on the emission, performance and, combustion characteristics of a gasoline engine fueled with iso-butanol (10%, 30% and 50%) blended gasoline fuel. The tests were conducted for three different CRs (9:1,10:1 and 11:1) at 2600 rpm and wide-open throttle. The results indicate that the BSCF (brake specific fuel consumption), BTE (brake thermal efficiency) and the emissions of CO2 (carbon dioxide) increased while UHC (unburned hydrocarbon) and CO (carbon monoxide) emissions decreased with the increase in the amount of iso-butanol in the fuel mixture at all CRs. The best results for BSFC, BTE, the emissions of CO and UHC were observed at increased the CR. Moreover, the ICP (in-cylinder pressure) generally increased with the increase in the amount of isobutanol in the fuel mixture and the ICP and HRR (heat release rate) rose earlier than those values in gasoline. (C) 2015 Elsevier Ltd. All rights reserved.
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    The impact of fuel injection pressure on the exhaust emissions of a direct injection diesel engine fueled with biodiesel-diesel fuel blends
    (ELSEVIER SCI LTD, 2012) SAYIN, CENK; Gumus, Metin; Sayin, Cenk; Canakci, Mustafa
    In this study, the effects of fuel injection pressure on the exhaust emissions and brake specific fuel consumption (BSFC) of a direct injection (DI) diesel engine have been discussed. The engine was fueled with biodiesel-diesel blends when running the engine at four different fuel injection pressures (18, 20, 22, and 24 MPa) and four different engine loads in terms of mean effective pressure (12.5, 25, 37.5, and 50 kPa). The results confirmed that the BSFC, carbon dioxide (CO2), nitrogen oxides (NOx) and oxygen (O-2) emission increased, smoke opacity, unburned hydrocarbon (UHC) and carbon monoxide (CO) emissions decreased due to the fuel properties and combustion characteristics of biodiesel. On the other hand, the increased injection pressure caused to decrease in BSFC of high percentage biodiesel-diesel blends (such as B20, B50, and B100), smoke opacity, the emissions of CO, UHC and increased the emissions of CO2, O-2 and NOx. The increased or decreased injection pressure caused to increase in BSFC values compared to original (ORG) injection pressure for diesel fuel and low percentage biodiesel-diesel blends (B5). (C) 2011 Elsevier Ltd. All rights reserved.
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    PublicationOpen 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, Cenk
    In 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.
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    PublicationOpen Access
    Determination of Fuel Type for Optimal Performance and Emission in a CI Engine Used Biodiesel and its Blends via Multi-Criteria Decision Making
    (2019-10-01) SAYIN, CENK; SİNAN ERDOĞAN;MUSTAFA KEMAL BALKİ;CENK SAYIN
    In this study, fuel type which provides optimum performance and emission in compression ignition (CI)engine used alternative fuel was determined by COPRAS (Complex Proportional Assessment) in multicriteriadecision making (MCDM), and it was ranked from good to bad. Furthermore, the engineperformance and emission consequences obtained from the use of fuels are discussed. In the experiments,pure biodiesel, diesel, and biodiesel/diesel blend fuels at a ratio of 5, 20 and 50% by volume were used asan alternative fuel. The performance and exhaust emission characteristics of the engine have been obtainedin the tests performed at 7.2 kW power output and 1500 rpm of the constant engine speed. According toexperimental results, with the uptrend of the biodiesel ratio in the blended fuel, it has been observed thatwhile the specific fuel consumption (SFC) is enhanced to diesel, the thermal efficiency (η) is partiallyreduced. At the same time, the emissions of the nitrogen oxide (NOx), carbon monoxide (CO) hydrocarbon(HC), and carbon monoxide (CO) decreased while the carbon dioxide (CO2) emission enhanced. Accordingto the COPRAS method, the ranking of fuels from best to worst was calculated as B5>B20>B50>B0>B100.
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    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, Cenk
    In 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.
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    Effects of thermal barrier coating on the performance and combustion characteristics of a diesel engine fueled with biodiesel produced from waste frying cottonseed oil and ultra-low sulfur diesel
    (TAYLOR & FRANCIS INC, 2016) SAYIN, CENK; Aydin, Selman; Sayin, Cenk; Altun, Sehmus; Aydin, Huseyin
    In this study, the top surfaces of piston and valves of a four-strokes and direct-injection diesel engine have been coatedwith no change in the compression ratiowith a 100 m of NiCrAl lining layer via plasma spray method and this layer has later been coated with main coating material with a mixture of 88% of ZrO2, 4% of MgO and 8% of Al2O3 (400 m). Then, after the engine-coating process, ultra-low sulfur diesel (ULSD) as base fuels and its blend with used frying cottonseed oil derived biodiesel in proportion of 20%, volumetrically, have been tested in the coated engine and data of combustion and performance characteristics on full load and at different speeds have been noted. The results, which were compared with those obtained by uncoated-engine operation, showed that thermal efficiency increased, and engine noise reduced. Cylinder gas pressure values obtained from the diesel engine which has been coated with thermal barriers have been found to be somewhat higher than those of the uncoated-engine. Also, maximum pressure values measured in both engines and under the same experimental conditions through the use of test fuel have been obtained after TDC. Moreover, heat release rate and heat release have occurred earlier in the coated-engine. NOx emissions were increased while CO and HC emissions were remained almost the same with a little bit decrease.
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    Effect of fuel injection pressure on the injection, combustion and performance characteristics of a DI diesel engine fueled with canola oil methyl esters-diesel fuel blends
    (PERGAMON-ELSEVIER SCIENCE LTD, 2012) SAYIN, CENK; Sayin, Cenk; Gumus, Metin; Canakci, Mustafa
    In this study, the influence of injection pressure on the injection, combustion and performance characteristics of a single cylinder, four stroke, direct injection, naturally aspirated diesel engine has been experimentally investigated when using canola oil methyl esters (COME) and its blends with diesel fuel. The tests were conducted for four different injection pressures (18, 20, 22 and 24 MPa) at constant engine speed and different loads. The experimental results showed that the fuels exhibit different injection, combustion and performance characteristics for different engine loads and injection pressure. Investigation on the injection characteristics of the fuels showed that using COME instead of diesel resulted in earlier injection timings. The maximum cylinder pressure, the maximum rate of pressure rise and the maximum heat release rate are slightly lower for COME and its blends. The brake specific fuel consumption and brake specific energy consumption for COME are higher than that for diesel fuel while brake thermal efficiency of COME is generally lower than that of diesel fuel. The increased injection pressure gave better results for brake specific fuel consumption and brake thermal efficiency compared to the original and decreased injection pressures. (C) 2012 Elsevier Ltd. All rights reserved.