Person: GÜMÜŞ, METİN
Loading...
Email Address
Birth Date
Research Projects
Organizational Units
Job Title
Last Name
GÜMÜŞ
First Name
METİN
Name
12 results
Search Results
Now showing 1 - 10 of 12
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 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 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 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 Use of hydrogen-biogas mixture as fuel in common-rail dieselengine with thermal barrier coating(2022-10-07) YILMAZ, İLKER TURGUT; GÜMÜŞ, METİN; ŞANLI A., YILMAZ İ. T. , AKÇAY M., GÜMÜŞ M.Publication Metadata only Investigation of combustion and emission characteristics in a TBC diesel engine fuelled with CH4-CO2-H-2 mixtures(PERGAMON-ELSEVIER SCIENCE LTD, 2021) YILMAZ, İLKER TURGUT; Sanli, Ali; Yilmaz, Ilker Turgut; Gumus, MetinIn this study, an experimental investigation was performed to reveal combustion and emission characteristics of common-rail four-cylinder diesel engine run with CH4, CO2 and H-2 mixtures. The engine pistons were thermally coated with zirconia and Ni-Al bond coat by plasma spray method. With a small amount of the pilot diesel, port fuelled methane (100% CH4), synthetic biogas (80% CH4 + 20% CO2), and hydrogen presented (80% CH4+10% CO2+10% H-2) mixtures were used as main fuel at different loads (50 Nm, 75 Nm, and 100 Nm) at a constant speed of 1750 min(-1). Comparative analysis of the combustion (cylinder pressure, PRR, HRR, CHR, ringing intensity, CA10, CA50, and CA90), BSFC, and emissions (CO2, HC, NOx, smoke, and oxygen) at the various engine loads with and without piston coating was made for all fuel combinations. It was found that coating the engine pistons enhanced the examining combustion characteristics, whereas it slightly changed BSFC and most of the emissions. As compared to the sole diesel fuel, the gaseous fuel operations showed higher in-cylinder pressure, PRR, and ringing intensity values, earlier combustion starting and CAs, and lower diesel injection pressure at the same engine operating conditions. Dramatic increase in the ringing intensity was particularly found by the hydrogen introduced mixture under the tests with coated piston. HC and CO2 emissions increased in operation with the synthetic biogas; however, hydrogen introduction reduced HC emissions by 4.97-30.92%, and CO2 emissions by 5.16-10%. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Publication Metadata only Experimental Evaluation of Performance and Combustion Characteristics in a Hydrogen-Methane Port Fueled Diesel Engine at Different Compression Ratios(AMER CHEMICAL SOC, 2020) YILMAZ, İLKER TURGUT; Sanli, Ali; Yilmaz, Ilker Turgut; Gumus, MetinThis paper investigates the performance and combustion characteristics of a common-rail diesel engine fueled with methane and hydrogen enrichment of methane under different loads (2.15, 4.3, 6.45, and 8.6 bar) and compression ratios (CRs) (18.25, 16.9, and 15.8). Traditional diesel fuel is used as the pilot fuel and is injected twice as pre- and main injections. Results of the usage of gaseous fuels are compared with each other and the single diesel mode. Accordingly, brake thermal efficiency (BTE) and brake specific energy consumption (BSEC) are highly deteriorated at low loads, but they improve with load. Hydrogen substitution results in slightly higher BTE and lower BSEC. The average exhaust temperature with gaseous fuels is enhanced compared to that with diesel. Peak cylinder pressures of dual-fuel operations are higher, and an earlier heat release is observed; moreover, combustion noise of dual-fuel operations is further enhanced under a high CR-high load condition. Finally, combustion durations substantially change with loads and CRs.Publication Metadata only Power and Efficiency Analysis of Diesel Cycle Under Alternative Criteria(SPRINGER HEIDELBERG, 2014) GÜMÜŞ, METİN; Atmaca, Mustafa; Gumus, MetinModel studies of the internal combustion engine cycles are useful for illustrating some important parameters affecting engine performance. The Diesel cycle is considered as a special case of an internal combustion engine. In the diesel cycle, combustion is controlled in order to obtain constant pressure at the beginning of the expansion stroke. It is important to choose the proper optimization criterion for the optimum design of the internal combustion engines. The choice of optimization criterion can be changed depending on the purpose of engine design and working conditions of the internal combustion engine. In this study, a comparative performance analysis is carried out for a reversible air standard Diesel cycle based on three alternative performance criteria, namely, maximum power (mp), maximum power density (mpd) and maximum efficient power (mep). The effects of the design parameters such as volume ratio and extreme temperature ratio of the cycle have been investigated under mp, mpd, mep and maximum efficiency conditions. The results show that the design parameters at mep conditions lead to more efficient engines than that at the mp conditions and that the mep criterion may have a significant power advantage compared to mpd criterion.Publication Metadata only Influence of injector hole number on the performance and emissions of a DI diesel engine fueled with biodiesel-diesel fuel blends(PERGAMON-ELSEVIER SCIENCE LTD, 2013) SAYIN, CENK; Sayin, Cenk; Gumus, Metin; Canakci, MustafaIn diesel engines, fuel atomization process strongly affects the combustion and emissions. Injector hole number (INHN) particular influence on the performance and emissions because both parameters take important influence on the spray parameters like droplet size and penetration length and thus on the combustion process. Therefore, the INHN effects on the performance and emissions of a diesel engine using biodiesel and its blends were experimentally investigated by running the engine at four different engine loads in terms of brake mean effective pressure (BMEP) (12.5, 25, 37.5 and, 50 kPa). The injector nozzle hole size and number included 340 x 2 (340 mu m diameter holes with 2 holes in the nozzle), 240 x 4, 200 x 6, and 170 x 8. The results verified that the brake specific fuel consumption (BSFC), carbon dioxide (CO2) and nitrogen oxides (NOx) emission increased, smoke opacity (SO), hydrocarbon (HC) and carbon monoxide (CO) emissions reduced due to the fuel properties and combustion characteristics of biodiesel. However, the increased INHN caused a decrease in BSFC at the use of high percentage biodiesel diesel blends (B50 and B100), SO and the emissions of CO, HC. The emissions of CO2 and NOx increased. Compared to the original (ORG) INHN, changing the INHN caused an increase in BSFC values for diesel fuel and low percentage biodiesel-diesel blends (B5 and B20). (C) 2013 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.