Person: GÜMÜŞ, METİN
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GÜMÜŞ
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METİN
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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 Assessment of combustion and exhaust emissions in a common-rail diesel engine fueled with methane and hydrogen/methane mixtures under different compression ratio(PERGAMON-ELSEVIER SCIENCE LTD, 2020) YILMAZ, İLKER TURGUT; Sanli, Ali; Yilmaz, Ilker Turgut; Gumus, MetinThis study investigates the potential usage of the methane and hydrogen enriched methane in a turbocharged common-rail direct injection diesel engine. Methane and hydrogen/methane mixtures are sent through the air intake manifold of the engine. The engine is operated at four different loads and three different compression ratios. Results are compared amongst single diesel and dual-fuel operations at different compression ratios and load conditions. Compared to diesel, dual-fuel operations mostly generate higher and advanced peak in-cylinder gas pressure, more combustion noise, late pilot injection and start of combustion, advanced combustion center, substantial variations at ignition delay and combustion duration, a significant increase in cyclic variations at low and medium loads, and earlier heat release. Hydrogen enrichment decreases evidently specific fuel consumption. Concerning emissions, compared to diesel operation, dual-fuel operations produce higher total hydrocarbon (THC) and nitrogen oxides (NOx) but lower carbon dioxide (CO2). Hydrogen substitutions decrease THC and CO2 emissions of methane dual-fuel operations approximately between 9-29% and 1-32%, respectively. Smoke emission of dual-fuel operations is less than that of diesel at low and medium loads, whereas it sharply increases at high load. Knocking occurs at high compression ratio and load conditions with dual-fuel operations and dramatically increases with increasing hydrogen ratio. Decreasing the compression ratio notably reduces the combustion noise as well as some emissions, such as NOx, CO2 and smoke, for entire load ranges of dual-fuel and diesel operations. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Publication Metadata only 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, MustafaIn 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.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.