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SAYIN, CENK

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End date: 2019 × Subject: BIODIESEL ×

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Now showing 1 - 8 of 8
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    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, Metin
    In 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.
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    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, Ali
    In 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.
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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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    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.
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    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.
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    The influence of operating parameters on the performance and emissions of a DI diesel engine using methanol-blended-diesel fuel
    (ELSEVIER SCI LTD, 2010) SAYIN, CENK; Sayin, Cenk; Ozsezen, Ahmet Necati; Canakci, Mustafa
    In this study, the effects of injection pressure and timing on the performance and emission characteristics of a DI diesel engine using methanol (5%, 10% and 15%) blended-diesel fuel were investigated. The tests were conducted on three different injection pressures (180, 200 and 220 bar) and timings (15 degrees, 20 degrees, and 25 degrees CA BTDC) at 20 Nm engine load and 2200 rpm. The results indicated that brake specific fuel consumption (BSFC), brake specific energy consumption (BSEC), and nitrogen oxides (NOx) emissions increased as brake thermal efficiency (BTE), smoke opacity, carbon monoxide (CO) and total unburned hydrocarbon (THC) decreased with increasing amount of methanol in the fuel mixture. The best results were achieved for BSFC, BSEC and BTE at the original injection pressure and timing. For the all test fuels, the increasing injection pressure and timing caused to decrease in the smoke opacity, CO, THC emissions while NOx emissions increase. (C) 2009 Elsevier Ltd. All rights reserved.
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    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, Mustafa
    Biodiesel 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.
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    Comparison of performance and combustion parameters in a heavy-duty diesel engine fueled with iso-butanol/diesel fuel blends
    (SAGE PUBLICATIONS INC, 2011) SAYIN, CENK; Ozsezen, Ahmet Necati; Turkcan, All; Sayin, Cenk; Canakci, Mustafa
    This study discusses the suitability of iso-butanol/diesel fuel blends as an alternative fuel and determines their effects on the performance and combustion characteristics of a heavy-duty diesel engine. For this purpose, various iso-butanol/diesel fuel blends containing 5%, 10% and 15% iso-butanol were prepared in volume basis and tested in a turbo-charged, six-cylinder direct injection diesel engine at the speed of 1400 rpm and three different loads (150, 300 and 450 Nm). The results indicate that when the test engine was fueled with the iso-butanol/diesel fuel blends, the brake thermal efficiency decreased, while the brake specific fuel consumption increased with proportion to using conventional diesel fuel. When iso-butanol/diesel fuel blends were used, the heat release rate; the peak cylinder gas pressure slightly increased compared to the neat diesel fuel use. Although the iso-butanol/diesel fuel blends have poor performance values at partial engine loads, their fuel properties affected the combustion and injection characteristics. They caused reductions in CO, NOx emissions and smoke opacity. However, unburned HC emission slightly increased.