Ilker Turgut Yilmaz

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Verified

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• Doctor of Philosophy
• Professor (Associate) at Marmara University

In this study, the effect of biogas on the thermal barrier coated (TBC) dual-fuel engine was experimentally investigated. Experiments were carried out on a four cylinder, water cooled, turbocharged, common-rail coated and uncoated diesel engine under dual-fuel (biogas-diesel) mode and single fuel (neat diesel) mode. Combustion chambers of the pisto...

In this study a comprehensive investigation of combustion (cylinder pressure, rate of pressure rise, ignition delay) and heat release (rate of heat release, cumulative heat release and center of heat release) parameters of a four cylinder, turbocharged, common rail compression ignition engine running with hydrogen addition was carried out. Hydrogen...

It is known that the efficiency of internal combustion diesel engines changes %38-42. It is about %60 of the fuel energy dismissed from combustion chamber. To save energy, combustion chamber component are coated with low thermal conduction materials. In this paper, give an eye to thermal barrier coating and ceramic materials which are used for maki...

Bu çalışmada biyogazın çift yakıtlı bir dizel motorda ana yakıt olarak kullanılmasıyla elde edilen silindir basınçları, özgül yakıt tüketimleri ve egzoz emisyonları deneysel olarak incelenmiştir. Deneylerde motor devri 1750 d/d’da sabit tutulurken, motor yükü 50 Nm, 75 Nm ve 100 Nm olarak değiştirilmiştir. Elde edilen sonuçlar biyogazın dizel motor...

This paper reports an investigation of the engine performance and emissions of an engine burning hydrogen-enriched diesel fuel. Hydrogen was chosen as the secondary fuel for its renewability in the long term and overall sustainability as a fuel. A four-cylinder, four-stroke, 1.461-L diesel engine with a common rail injection system was used for our...

Reactivity-controlled compression ignition (RCCI) combustion is considered one of the most promising low-temperature combustion (LTC) concepts aimed at reducing greenhouse gases for the transportation and power generation sectors. RCCI combustion mode is achieved by combining different fuel types with low and high temperatures. The aim of this stud...

Combustion stability in diesel engines is defined by cycle-to-cycle variations. In this study, effects of piston coating and engine load on cycle-to-cycle combustion behavior were investigated in a diesel engine operated on gaseous fuel mixture at different loads. Coated and uncoated piston tests under dual-fuel and single diesel modes were perform...

Bu çalışmada, piston oyukları düşük ısı iletim katsayısına sahip bir malzemeyle kaplanmış direkt püskürtmeli bir dizel motorun yanma odası ısı transfer karakteristikleri incelenmiştir. Testler, sabit devirde ve dört farklı motor yükünde yapılmıştır. Piston oyukları plazma sprey yöntemiyle itriya stabilize zirkonya maddesi ile kaplanmıştır. Isı taşı...

Due to increasing global warming concerns, the search for alternative fuels has accelerated to reduce exhaust emissions from internal combustion engines and to reduce dependence on fossil fuels. In this study, the effect of the use of n-heptane-diesel (H20), butanol-diesel (B20) fuel mixtures on the combustion characteristics of a four-cylinder com...

Bu çalışmada, yüksek basınçlı yakıt püskürtme teknolojisine sahip dört silindirli bir dizel motorda hidrojen gazı emme kanalından fumigasyon yöntemiyle silindirlere verilerek sabit devirde (1750 d/dak) iki farklı motor yükünde (60 Nm ve 100 Nm) test edilmiştir. Hidrojen debisi, dakikada 10 litreden (H10) 50 litreye (H50) kadar 10 l/dak’lık artışlar...

In this study, performance and combustion characteristics of biogas and biogas+hydrogen mixtures were experimentally analysed and compared with baseline diesel fuel in a common-rail diesel engine with and without thermal barrier coated piston. Tests were conducted at three different loads (50 Nm, 75 Nm, and 100 Nm) and a constant speed of 1750 min-...

Due to the limited availability of fossil fuels in the world, researchers have focused on research on alcohol-fossil diesel fuel mixtures in recent years. In this study, the effects of HIB15 (5% nHeptane, 5% isopropanol, 5% Butanol) and HIB30 (10% nHeptane, 10% isopropanol, 10% Butanol) fuel mixtures on the exhaust emissions of a 4-cylinder 8-valve...

An experimental cycle-to-cycle analysis in multi-cylinder automotive common-rail compression ignition engine was performed to understand better the combustion in the hydrogen fuelled diesel engine. Hydrogen was fumigated in intake line at a wide-ranging from 0 lpm to 50 lpm in steps of 10 lpm. Test engine was operated at three different loads for a...

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-base...

In this study, the effect of hydrogen assisted intake air on combustion characteristics of a diesel fuel-waste cooking oil biodiesel (WCOB) blend fueled CI engine has been extensively studied. While the diesel and B25 (75% diesel fuel+25% WCOB) fuels used as the main fuel were sprayed directly into the cylinder, the hydrogen, the secondary fuel was...

Fosil kökenli yakıtların dünya üzerinde sınırlı sayıda bulunmasından dolayı, araştırmacılar son yıllarda alkol-fosil kökenli dizel yakıt karışımları üzerine araştırmalara odaklanmışlardır. Bu çalışmada, metanol-dizel, etanol-dizel ve bütanol-dizel yakıt karışımlarının 4 silindirli 8 valfli bir dizel motorun egzoz emisyonları üzerine etkileri incele...

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 ori...

In 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 H2 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 (1...

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 numer...

In this study, the effect of ethanol-canola oil methyl ester (COME) blends on combustion characteristics of a common-rail diesel engine was experimentally investigated. COME fuel was obtained by transesterification method from refined canola oil. 5%, 10% and 15% ethanol by volume was blended with COME fuel. In study a four cylinder, four stroke, wa...

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 t...

In internal combustion engines, the use of gas fuels is becoming widespread due to its advantages such as low cost and being more environmentally friendly. Acetylene is one of the gas fuels seen as an alternative to petroleum-based fuels in internal combustion engines. In this experimental study, the availability of acetylene gas, a gas fuel, at 16...

In the process of testing the internal combustion engines, high-cost engine test dynamometers are generally used. The aim of this study is to obtain a low-cost internal combustion engine tester by converting a single-cylinder diesel engine generator into a motor tester, rather than a high-cost internal combustion engine test dynamometer. Engine per...

This 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 bar, 4.3 bar, 6.45 bar, 8.6 bar) and compression ratios (CRs) (18.25, 16.9, 15.8). Traditional diesel fuel is used as pilot fuel and injected twice as pre and main i...

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 compar...

The best way of using the resources more efficiently is understanding the relationship between energy and exergy. The first law of thermo-dynamics associates with the energy analysis. This law of thermodynamics is about quantity of energy. Energy analysis helps explaining the energy and enthalpy transfers of the system. Energy cannot be destroyed b...

İçten yanmalı motorların enerji ihtiyaçları genellikle fosil yakıtlardan karşılanmaktadır. Fosil yakıtların gün geçtikçe tükenmelerine bağlı olarak yenilenebilir enerji kaynakları araştırmacıların ilgisini çekmektedir. Biyogaz organik atıklardan üretilen alternatif bir yakıttır. Bu çalışmada dizel-biyogaz çift yakıtlı bir motorda dizel yakıt miktar...

In this paper, a research on effect of hydrogen amount on hydrogen-diesel fuelled compression ignition (CI) engine was conducted. Hydrogen was continuously inducted into a mixing chamber. Diesel fuel was sent into cylinders by Common Rail fuel injection system. A four-cylinder, four-stroke, water cooled, 1.461-L and turbocharged CI engine was used...

ZET: Bu çalışmada, ortak hatlı (common-rail) dizel motorda metan ve metan/hidrojen gaz yakıtlarının deneysel yanma sonuçlarının karşılaştırmalı analizi sunulmaktadır. Gaz yakıtlar emme manifoldundan emme havası ile birlikte motora verilmektedir. Deneyler sabit devirde (1750 d/dak) iki farklı yükte (25 Nm ve 75 Nm) ve iki farklı sıkıştırma oranında...

The main object of this study was to examine the effect of thermal barrier coating on combustion parameters of a common rail diesel engine. To achieve this, combustion chambers of the pistons were coated with 100 μm thickness Ni-Al bond coat by using plasma spray coating technique. 400 μm thickness 8% yittria stabilized zirconia was the main coat....

In this study, exhaust emissions (HC, CO2, NOx and smoke), brake specific fuel consumption thermal and volumetric efficiency of low heat rejection engine was experimentally investigated. Experiments were carried out on a four cylinder, water cooled, turbocharged, common-rail diesel engine under 50 Nm, 75 Nm, 100 Nm and 120 Nm engine loads at 1750 r...

The problem of energy consumption is growing because of the increase in population. Energy demand is commonly supplied by the fossil fuels however they bring up against the problem of run out. Biogas is a renewable fuel which is a candidate for duel fuel diesel engines. This work focuses on the effect of carbon dioxide on exhaust emission character...

ZET Performansın arttırılmasına yönelik olarak dizel motorların emme havasına hidrojen eklenmesinin yanma karakteristiğine, motor performansına ve egzoz emisyonlarına etkisi, yapılan çalışmalarda farklı sonuçların elde edilmesinden dolayı, aydınlatılmaya muhtaç bir konu olarak araştırmacıların gündeminde güncel bir konu olarak bulunmaktadır. Bu çal...

Abstract Biodiesel is a fuel that used in diesel engines produced from various renewable resources (plant, animal fats, waste oils, algae, etc.) and has high potential to be an alternative to standard diesel fuel. Using waste oils which cause significant damages when they are poured to environment should be preferred rather than using edible oils a...

It is known that the efficiency of internal combustion diesel engines changes %38-42. It is about %60 of the fuel energy dismissed from combustion chamber. To save energy, combustion chamber component are coated with low thermal conduction materials. In this paper, give an eye to thermal barrier coating and ceramic materials which are used for maki...

In this paper, a scientific based systematical selection model approach has been planned for decision making problem which appears during vehicle purchasing. A vehicle selection model which belongs to systematical process has been developed. With using this program, processes like to facilitate decision making for user, to reduce selection time, pr...

zet Bu çalışmada, tüketicilerin araç alırken karşılaştığı problemlere sistematik bir çözüm yaklaşımı sunulması hedeflenmiştir. Bu amaçla, sistematik bir araç seçim modeli geliştirilmiştir. Araç seçim modelinin üç temel aşaması bulunmaktadır. Bu aşamalarda sırasıyla; problemi tanımlama, optimum araç seçimi ve sonuç raporu hazırlama olarak özetlenebi...