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 Effects of biodiesel from used frying palm oil on the exhaust emissions of an indirect injection (IDI) diesel engine(AMER CHEMICAL SOC, 2008) SAYIN, CENK; Ozsezen, Ahmet Necati; Canakci, Mustafa; Sayin, CenkIn our previous paper, the influences of biodiesel and its blends on the performance, combustion, and injection characteristics of an indirect injection (IDI) diesel engine have been discussed. The results have indicated that, when the test engine was fueled with biodiesel and its blends, the maximum brake torque, brake thermal efficiency, and brake power dropped, while the brake-specific fuel consumption increased compared to the petroleum-based diesel fuel (PBDF). The main differences in the combustion and injection characteristics of biodiesel and its blends are earlier premixed combustion, shorter ignition delay, higher cylinder gas pressure, and earlier start of injection in terms of the PBDF. This paper discusses the exhaust emission results obtained in the same study. The emission results showed that carbon monoxide (CO), unburned hydrocarbon (HC) emissions, and smoke opacity decreased with the increase of biodiesel percentage in the fuel blend for all engine speeds under the full-load condition. However, NOx and CO2 emissions showed different behaviors in terms of the engine speed.Publication Metadata only Influence of injection timing on the exhaust emissions of a dual-fuel CI engine(PERGAMON-ELSEVIER SCIENCE LTD, 2008) SAYIN, CENK; Sayin, Cenk; Uslu, Kadir; Canakci, MustafaEnvironmental concerns and limited amount of petroleum fuels have caused interests in the development of alternative fuels for internal combustion (IC) engines. As an alternative, biodegradable, and renewable fuel, ethanol is receiving increasing attention. Therefore, in this study, influence of injection timing on the exhaust emission of a single cylinder, four stroke, direct injection, naturally aspirated diesel engine has been experimentally investigated using ethanol blended diesel fuel from 0% to 15% with an increment of 5%. The engine has an original injection timing 27 degrees CA BTDC. The tests were performed at five different injection timings (21 degrees, 24 degrees, 27 degrees, 30 degrees, and 33 degrees CA BTDC) by changing the thickness of advance shim. The experimental test results showed that NOx and CO2 emissions increased as CO and HC emissions decreased with increasing amount of ethanol in the fuel mixture. When compared to the results of original injection timing, at the retarded injection timings (21 degrees and 24 degrees CA BTDC), NOx and CO2 emissions increased, and unburned HC and CO emissions decreased for all test conditions. On the other hand, with the advanced injection timings (30 degrees and 33 degrees CA BTDC), HC and CO emissions diminished, and NOx and CO2 emissions boosted for all test conditions. (C) 2007 Elsevier Ltd. All rights reserved.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 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 Investigation of the usability of biodiesel obtained from residual frying oil in a diesel engine with thermal barrier coating(PERGAMON-ELSEVIER SCIENCE LTD, 2015) SAYIN, CENK; Aydin, Selman; Sayin, Cenk; Aydin, HuseyinIn this study, biofuel was produced from residual frying oil of cottonseed and D2, B5 and B100 fuels were prepared in order to use in experiments. These fuels were tested in a single cylinder, four strokes, 3 LD 510 model Lombardini Cl engine. Then the top surfaces of the piston and valves were coated with plasma spray coating method by using 100 p.m of NiCrAl as lining layer and over this layer the same surfaces were coated with 400 gm of the mixture that consists of %88 Zr02, %4 MgO and %8 Al203. After the coating process, above mentioned fuels were tested in the coated engine. Previously, same fuels had been tested in uncoated engine, at full load and various speeds. Performance, emission and combustion experiments were carried out in coated engine. By coating process, partial increases were observed in power, exhaust manifold temperature and engine noise, while partial decreases were seen in brake specific fuel consumption (Bsfc). Besides, partial reductions were found in carbon monoxide (CO), hydrocarbon (HC) and smoke opacity emissions, but partial increases were observed in nitrogen oxide (NO) emissions. Cylinder gas pressure values were higher for coated engine. Moreover, heat releases were close to each other in both engines. (C) 2015 Elsevier Ltd. All rights reserved.Publication Metadata only Effects of injection timing on the engine performance and exhaust emissions of a dual-fuel diesel engine(PERGAMON-ELSEVIER SCIENCE LTD, 2009) SAYIN, CENK; Sayin, Cenk; Canakci, MustafaIn this study, influence of injection timing on the engine performance and exhaust emissions of a naturally aspirated, single cylinder diesel engine has been experimentally investigated when using ethanol blended diesel fuel from 0% to 15% with an increment of 5%. The engine load was selected as 15 and 30 Nm. The tests were conducted at five different injection timings (21 degrees, 24 degrees, 27 degrees, 30 degrees and 33 degrees CA BTDC) by changing the thickness of advance shim. The experimental test results showed that BSFC and emissions of NOx and CO2 increased as BTE and emissions of CO and HC decreased with increasing amount of ethanol in the fuel mixture. When compared to the results of original injection timing (27 degrees CA BTDC), NOx and CO2 emissions increased, and unburned HC and CO emissions decreased for the retarded injection timings (21 degrees and 24 degrees CA BTDC) at the all test conditions. On the other side, with the advanced injection timings (30 degrees and 33 degrees CA BTDC) decreasing HC and CO emissions diminished, and NOx and CO2 emissions boosted. in terms of BSFC and BTE, retarded and advanced injection timings compared to the original injection timing in the all fuel blends gave negative results for all engine speeds and loads. (C) 2008 Elsevier Ltd. All rights reserved.Publication Metadata only The effect on the knock intensity of high viscosity biodiesel use in a DI diesel engine(ELSEVIER SCI LTD, 2019) SAYIN, CENK; Erdogan, Sinan; Balki, Mustafa Kemal; Sayin, CenkIn this study, the effect of usage of biodiesel fuel with higher viscosity on the engine knock intensity was investigated. The animal biodiesel (AB) and the vegetable biodiesel (VB) were used as fuel in the study. It was seen that the AB had a high viscosity, while the viscosity of VB is within the limits determined by the standards (EN 14214 and ASTM D6751). In the engine tests carried out at constant engine speed and high load, ringing intensity (RI) and knock intensity values were found with in-cylinder pressure data obtained from three fuel types. In addition, the in-cylinder gas pressure, heat release rate and cumulative heat release curves for the three fuel types are presented. According to the results, the effects of high viscosity biodiesel usage on these values were found to be limited. It was also observed that the RI was lower than that of D2 and higher than that of VB.