Person: SAYIN, CENK
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SAYIN
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CENK
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Publication Metadata only Exhaust Emissions and Combustion Characteristics of a Direct Injection (DI) Diesel Engine Fueled with Methanol-Diesel Fuel Blends at Different Injection Timings(AMER CHEMICAL SOC, 2008) SAYIN, CENK; Canakci, Mustafa; Sayin, Cenk; Gumus, MetinIn the recent years, environmental concerns and depletion in petroleum resources have forced researchers to concentrate on finding renewable alternatives to conventional petroleum fuels. Therefore, alcohols as renewable and alternative energy sources for the diesel engines gain importance. For this reason, in this study, the performance, exhaust emissions, and combustion characteristics of a single cylinder diesel engine have been experimentally investigated under different injection timings when methanol-blended diesel fuel was used from 0 to 15%, with an increment of 5%. The tests were conducted at three different injection timings (15 degrees, 20 degrees, and 25 degrees CA BTDC) by changing the thickness of advance shim. All tests were conducted at four different loads (5, 10, 15, and 20 Nm) at constant engine speed of 2200 rpm. The experimental test results showed that BSFC, BSEC, combustion efficiency, and NOx and CO2 emissions increased as BTE, rate of heat release, peak cylinder pressure, smoke number, and CO and UHC emissions decreased with an increasing amount of methanol in the fuel blend. In comparison to the values at the original injection timing (20 degrees CA BTDC), the values at the retarded injection timing (15 degrees CA BTDC) of peak cylinder pressure, rate of heat release, combustion efficiency, and NOx and CO2 emissions decreased, while smoke number and UHC and CO emissions increased at all test conditions. On the other hand, The advanced injection timing (25 degrees CA BTDC), smoke number, and UHC and CO emissions diminished and peak cylinder pressure, rate of heat release, combustion efficiency, and NOx and CO2 emissions increased at all test conditions. In terms of BSFC, BSEC, and BTE, retarded and advanced injection timings gave negative results in all fuel blends compared to original injection timing.Publication Metadata only 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, MuratIn 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.Publication Metadata only Effect of injection timing on the exhaust emissions of a diesel engine using diesel-methanol blends(PERGAMON-ELSEVIER SCIENCE LTD, 2009) SAYIN, CENK; Sayin, Cenk; Ilhan, Murat; Canakci, Mustafa; Gumus, MetinEnvironmental concerns and limited resource of petroleum fuels have caused interests in the development of alternative fuels for internal combustion (IC) engines. For diesel engines, alcohols are receiving increasing attention because they are oxygenated and renewable fuels. Therefore, in this study, the effect of injection timing on the exhaust emissions of a single cylinder, naturally aspirated, four-stroke, direct injection diesel engine has been experimentally investigated by using methanol-blended diesel fuel from 0% to 15% with an increment of 5%. The tests were conducted for three different injection timings (15 degrees, 20 degrees and 25 degrees CA BTDC) at four different engine loads (5 Nm, 10 Nm, 15 Nm, 20 Nm) at 2200 rpm. The experimental test results showed that Bsfc, NOx and CO2 emissions increased as BTE, smoke opacity, CO and UHC emissions decreased with increasing amount of methanol in the fuel mixture. When compared the results to those of original injection timing, NOx and CO2 emissions decreased, smoke opacity, UHC and CO emissions increased for the retarded injection timing (15 CA BTDC). On the other hand, with the advanced injection timing (25 degrees CA BTDC), decreasing smoke opacity, UHC and CO emissions diminished, and NOx and CO2 emissions boosted at all test conditions. In terms of Bsfc and BTE, retarded and advanced injection timings gave negative results for all fuel blends in all engine loads. (c) 2008 Elsevier Ltd. All rights reserved.Publication Metadata only Energy and exergy analyses of a gasoline engine(WILEY, 2007) SAYIN, CENK; Sayin, C.; Hosoz, M.; Canakci, M.; Kilicaslan, I.This study presents comparative energy and exergy analyses of a four-cylinder, four-stroke spark-ignition engine using gasoline fuels of three different research octane numbers (RONs), namely 91, 93 and 95.3. Each fuel test was performed by varying the engine speed between 1200 and 2400 rpm while keeping the engine torque at 20 and 40 Nm. Then, using the steady-state data along with energy and exergy rate balance equations, various performance parameters of the engine were evaluated for each fuel case. It was found that the gasoline of 91-RON, the design octane rating of the test engine, yielded better energetic and exergetic performance, while the exergetic performance parameters were slightly lower than the corresponding energetic ones. Furthermore, this study revealed that the combustion was the most important contributor to the system inefficiency, and almost all performance parameters increased with increasing engine speed. Copyright (c) 2006 John Wiley & Sons. Ltd.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 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, MustafaIn 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.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 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 Experimental Investigation on the Effect of Injection Pressure on the Exhaust Emissions of a Diesel Engine Fueled with Methanol-diesel Blends(TAYLOR & FRANCIS INC, 2011) SAYIN, CENK; Sayin, C.In this study, the effect of injection pressure on exhaust emissions of a diesel engine using methanol blended diesel fuel from 0 to 15% was investigated. A four-stroke, single-cylinder, naturally aspirated, direct-injection diesel engine was used for conducting this study. The original injection pressure of the engine is 200 bar. The tests were performed at three different injection pressures (180, 200, and 220 bar) by changing the injector spring tension. According to the test results, Bsfc and the emissions of NOx and CO2 increased as the emissions of smoke, CO, and unburned hydrocarbon decreased with an increasing amount of methanol in the fuel mixture. In addition, high injection pressure for smoke opacity, CO, and unburned hydrocarbon; low injection pressure for NOx; and CO2 must be preferred for decreasing emissions. In terms of Bsfc, the best results were obtained at 200 bar injection pressure for all engine loads.Publication Metadata only Effect of Fuel Injection Timing on the Emissions of a Direct-Injection (DI) Diesel Engine Fueled with Canola Oil Methyl Ester-Diesel Fuel Blends(AMER CHEMICAL SOC, 2010) SAYIN, CENK; Sayin, Cenk; Gumus, Metin; Canakci, MustafaBiodiesel is the name of a clean burning monoalkyl-ester-based oxygenated fuel made from natural, renewable sources, such as new/used vegetable oils and animal fats. The injection timing plays an important role in determining engine performance, especially pollutant emissions. In this study, the effects of fuel injection timing on the exhaust emission characteristics of a single-cylinder, direct-injection diesel engine were investigated when it was fueled with canola oil methyl ester diesel fuel blends. The results showed that the brake-specific fuel consumption and carbon dioxide and nitrogen oxide emissions increased and smoke opacity, hydrocarbon, and carbon monoxide emissions decreased because of the fuel properties and combustion characteristics of canola oil methyl ester. The effect of injection timing on the exhaust emissions of the engine exhibited the similar trends for diesel fuel and canola oil methyl ester diesel blends. When the results are compared to those of original (ORG) injection timing, at the retarded injection timings, the emissions of nitrogen oxide and carbon dioxide increased and the smoke opacity and the emissions of hydrocarbon and carbon monoxide decreased for all test conditions. On the other hand, with the advanced injection timings, the smoke opacity and the emissions of hydrocarbon and carbon monoxide diminished and the emissions of nitrogen oxide and carbon dioxide boosted for all test conditions. In terms of brake-specific fuel consumption, the best results were obtained from ORG injection timing in all fuel blends.