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YILMAZ, İLKER TURGUT

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    PublicationOpen Access
    Sıkıştırma ile Ateşlemeli Motorlarda Bilgisayar Destekli Enerji ve Ekserji Analizi
    (2019-09-30) YILMAZ, İLKER TURGUT; İLKER TURGUT YILMAZ
    Kaynakları daha verimli kullanmanın en iyi yolu, enerji ve ekserji arasındaki ilişkiyi anlamaktır. Termodinamiğin birinci kanunu enerji analiziile ilişkilidir. Bu kanun enerjinin niceliği ile alakalıdır. Enerji analizi sistemin enerji ve entalpi transferlerini açıklamaya yardımcı olur.Enerji yok edilemezken ekserji yok edilebilir. Ekserji bir sistemden elde edilebilecek maksimum teorik iş olarak tanımlanır. Diğer taraftanekserji analizi termodinamiğin ikinci yasasına dayanır. Termodinamiğin ikinci kanunu enerjinin niteliği ile alakalıdır. Bir sistemin kullanılabilirliğiekserji analizi ile belirlenebilir. Bir sistemin termodinamik detaylarının belirlenmesi istenildiğinde hem enerji, hem de ekserjianalizi yapılmalıdır.Ekserji ve enerji analizleri çeşitli alanlara uygulanabilir. Ekserji analizi, içten yanmalı motorlar konusunda önemli bir rol oynamaktadır.Bu çalışmada enerji ve ekserji analizi yapabilen bir programın tanıtımı ve yapısı gösterilmiştir. Program sayesinde hızlı ve güvenilir sonuçlarelde edilebilecektir.
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    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, Metin
    This 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.
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    Effect of nheptane/isopropanol/butanol/diesel blends on exhaust emissions in a commonrail diesel engine
    (2022-07-08) SAYIN, CENK; VARGÜN, MUSTAFA; YILMAZ, İLKER TURGUT; Vargün M., Yapmaz A., Yılmaz İ. T., Sayın C.
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    PublicationOpen Access
    The effect of diesel fuel amount on emissions in a diesel-biogas dual fueled engine
    (PAMUKKALE UNIV, 2020) YILMAZ, İLKER TURGUT; Yilmaz, Ilker Turgut; Yavuz, Mustafa; Gumus, Metin
    Fossil fuels generally meet the energy demand of internal combustion engines. Due to the run out fossil fuels day by day, renewable energy sources catch the researchers' attentions. Biogas is a renewable alternative fuel produced from organic wastes. In this paper, the effect of diesel fuel amount on the exhaust emissions of the biogas-diesel dual fuel engine was investigated. Experiments were carried out on a four stroke, four cylinder, water cooled, turbocharged, common-rail diesel engine. No changes were made on original settings of electronic control unit of the engine. The energy demands of dual fuel engine were supplied by diesel fuel about 20%, 30%, 40% and 50%. All tests were conducted at 1750 rpm constant speed, 40 Nm, 60 Nm and 80 Nm engine loads. Depending on increasing diesel fuel amount HC, CO2 and NOx emissions decreased but soot emissions raised. The increase in the amount of biogas sent to the cylinders increased both the amount of fuel burned in the premixed combustion phase and the NOx emissions. The CO2 contained in the biogas increased HC and soot emissions by diluting the fuel-air mixture.
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    Use of catanol and waste engine oil blends in diesel engine
    (2022-07-08) YILMAZ, İLKER TURGUT; Başaran H. Ç., Yılmaz İ. T., Akçay M.
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    Effect of hydrogen addition on performance and emission characteristics of a common-rail CI engine fueled with diesel/waste cooking oil biodiesel blends
    (PERGAMON-ELSEVIER SCIENCE LTD, 2020) FEYZİOĞLU, AHMET; Akcay, Mehmet; Yilmaz, Ilker Turgut; Feyzioglu, Ahmet
    In this study, the effect of hydrogen addition to a compression ignition (CI) engine fueled with the diesel fuel-waste cooking oil biodiesel (WCOB) blend (B25) on the engine performance, and exhaust emissions was examined experimentally. In the tests, a four-cylinder, four-stroke, water-cooled, 1.461-L, turbocharged CI engine was used. The engine tests were performed at the fixed engine speed of 1750 rpm and at the diverse engine loads of 40, 60 and 80 Nm. The hydrogen was added to the intake air at the flow rates of 10, 20, 30 and 40 lpm. According to the results obtained, hydrogen had a positive effect on break specific fuel consumption (BSFC) for all test conditions. The increase occurred at the exhaust gas temperatures (EGTs) and cylinder pressures (CPs) with hydrogen addition. The NOx and total hydrocarbon (THC) emissions decreased with the hydrogen addition until 30 lpm at 40 and 60 Nm engine loads. On the other hand, they increased at 80 Nm engine load for all hydrogen additions. While CO2 and O-2 emissions decreased with the hydrogen addition, the smoke emissions increased. It was found that the value of 30 lpm was the optimum condition of the hydrogen addition rates. (C) 2020 Elsevier Ltd. All rights reserved.
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    The effect of hydrogen on the thermal efficiency and combustion process of the low compression ratio CI engine
    (PERGAMON-ELSEVIER SCIENCE LTD, 2021) YILMAZ, İLKER TURGUT; Yilmaz, Ilker Turgut
    In this study, it was purposed to investigate the hydrogen enrichment effect on combustion characteristics of a low compression ratio turbocharged Common-Rail CI engine. The compression ratio was lowered from 18.25 to 16.9. Tests were conducted at 40 Nm, 60 Nm, 80 Nm, 100 Nm and 120 Nm loads at a constant 1750 rpm. Compared to the test with the original compression ratio, the low compression ratio tests yielded lower maximum cylinder pressures, maximum rate of heat releases, maximum rate of pressure rises, ringing intensity. Combustion durations increased but ignition delays fluctuated with hydrogen enrichment. The cylinder pressures, the first heat release and the first pressure rise rates increased with the higher hydrogen flow rates. Besides, the second peaks of pressure rise rates and heat release rates decreased. The hydrogen enrichment firstly increased and then decreased the brake thermal efficiency of the low compression ratio engine. Ringing intensity increased with increasing engine load and hydrogen amount.
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    Energy, Exergy and Exergo-Economic Characteristics of Hydrogen Enriched Hydrocarbon-Based Fuels in a Premixed Burner
    (TAYLOR & FRANCIS INC, 2021) YILMAZ, İLKER TURGUT; Ozdemir, Mehmed Rafet; Yangaz, Murat Umut; Yilmaz, Ilker Turgut
    The enrichment of conventional fuels by hydrogen is quite popular owing to positive environmental aspects compared to the main fuel. In most of the studies, the entropy analysis was not examined in detail. In this research, exergy (second law) analysis of hydrogen-enriched methane, natural gas, propane, LPG, and biogas were analyzed using the numerical model in a premixed burner due to their wide usage in the industry as well as in the household appliances. In the numerical model, the discrete ordinates radiation and Realizable k- epsilon turbulence models were coupled with the premixed combustion model. The rate of increase for hydrogen of each fuel is considered as 10%. The premixed burner exhibited better performance in terms of energy and exergy with the rise of hydrogen enrichment. The most improvement was observed at biogas tests. The results showed that the chemical composition of the base fuel is a significant parameter that affects the exergy and energy capability of the burner due to chain reactions of radicals in the base fuel with hydrogen. It can be concluded that the hydrogen enrichment of biogas in premixed burners is promising in comparison with other tested fuels from both energy and exergy perspective.
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    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.
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    PublicationOpen Access
    Investigation of performance, combustion and emission characteristics in a diesel engine fueled with methanol/ethanol/nHeptane/diesel blends
    (2022-10-01) VARGÜN, MUSTAFA; SAYIN, CENK; YILMAZ, İLKER TURGUT; Vargün M., Yılmaz İ. T., Sayın C.
    One of the important reasons of exhaust emissions harmful to the environment and human health is the use of fossil fuels in internal combustion engines as energy resources. In this study, in order to research for cleaner fuel resources and to reduce dependence on fossil fuels, 20% methanol, ethanol and n-heptane fuels added by volume to fossil-based diesel fuel. The effects on engine performance, combustion and exhaust emission characteristics were investigated in a diesel engine with a 4-cylinder common rail injection system, at different engine loads (40 Nm and 80 Nm) and different engine speeds (1500 rpm, 1600 rpm, 1700 rpm and 1800 rpm). The maximum brake thermal efficiency (BTE) value was obtained as 43% with diesel-methanol (M20) mixed fuel at 1800 rpm at 80 Nm engine load. Brake specific fuel consumption (BSFC) values improved in all fuel types with the increase in engine load. In all test conditions, the highest maximum cylinder gas pressure (CPmax) value was obtained with M20 fuel as 114.3 bar, while the highest cumulative heat release (CHRmax) value was determined as 811.7 J with diesel-nheptane (H20) fuel. Compared to diesel fuel (D100), the use of alcohol-diesel fuel mixtures resulted in longer ignition delay (ID) and shortened combustion duration (CD). In general, a significant reduction in carbon dioxide (CO2) emissions has been observed with the use of blended fuels. As a result of the increase in engine the load, a decrease in HC emissions was observed for all test fuels. When compared to D100 fuel, oxygen (O-2) and nitrogen oxide (NO) emissions were increased with the use of diesel-methanol (M20) and diesel-ethanol (E20) fuels, while O-2\ and NO emissions were decreased with the use of diesel-nheptane fuel. (C) 2022 Elsevier Ltd. All rights reserved.