Sürdürülebilir Kalkınma Amaçları
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- MakaleYalnız künye2026Effects of dual and single spark plug configurations on energy, exergy, and exhaust emissions in a spark ignition engine
Altın, İsmail; Bayraktar, Hakan; Sezer, İsmet
Effects of dual spark plug (DSP) operation in a spark ignition (SI) engine on energy, exergy, and exhaust emissions are numerically investigated in this study. A quasi–dimensional SI engine cycle model is used for the analyses. The practical correlations with no assume the fluid dynamics are occupied for the simulation of intake and exhaust periods and the turbulent flame propagation analogy is assigned for the modeling of combustion. The second law of thermodynamics is added to the cycle model to execute the exergy analysis. The thermodynamic parameters such as in–cylinder pressure and temperature, ignition delay, and burn duration with the engine performance parameters are evaluated in the energy analysis. The exergies transferred via heat, work, and exhaust gases, besides destroyed exergy, fuel chemical exergy, thermomechanical exergy and total exergy are compiled for the exergy analysis. The carbon monoxide (CO), nitrogen oxide (NO), and carbon dioxide (CO2) emissions are defined for emission performance analysis. The results show that DSP operation affects moderately energy, exergy, and exhaust emissions. The best results were obtained at dimensionless spark plug location (ratio of spark plug location radius to cylinder radius–Xsp) of 0.2 for DSP compared to centrally located single spark plug (SSP).
- MakaleYalnız künye2020A review study on using diethyl ether in diesel engines: Effects on fuel properties, injection, and combustion characteristics
Sezer, İsmet
This study was compiled from the results of various researches performed on using diethyl ether as a fuel or fuel additive in diesel engines. Three different techniques are used, the reduction of the harmful exhaust emissions of diesel engines. The first technique for the reduction of harmful emissions has improved the combustion by modification of engine design and fuel injection system, but this process is expensive and time-consuming. The second technique is the use of various exhaust gas devices like catalytic converter and diesel particulate filter. However, the use of these devices affects negatively diesel engine performance. The final technique to reduce emissions and also improve diesel engine performance is the use of various alternative fuels or fuel additives. The major pollutants of diesel engines are nitrogen oxides and particulate matter. It is very difficult to reduce nitrogen oxides and particulate matter emissions simultaneously in practice. Most researches declare that the best way to reduce these emissions is the use of various alternative fuels i.e. natural gas, biogas, biodiesel, or the use of fuel additives with these alternative fuels or conventional diesel fuel. Therefore, it is very important that the results of various studies on alternative fuels or fuel additives are evaluated together for practice applications. Especially, this study focuses on the use of diethyl ether in diesel engines as fuel or fuel additive in various diesel engine fuels. This review study investigates the effects of diethyl ether on the fuel properties, injection, and combustion characteristics.
- MakaleYalnız künye20193Bio-Based Additives to Improve Diesel Engine Performance and Emissions
Sezer, İsmet
This study investigates addition of ethanol and diethyl ether into diesel fuel. Base fuel and three different blends were used in the tests. The experiments were performed at engine speed of 1500 rpm and under various loads by single cylinder diesel engine. Injection, combustion, performance and emissions parameters were evaluated for base fuel and blends. Results show that injection pressure decreases for all blends, and DEE addition causes delay in injection timing. Burnt mass fraction is lower for ethanol and DEE blends during early combustion phase, while it increases with DEE blends during progressive combustion phase. Ethanol and DEE blends also give reductions in cylinder pressure and temperature. Generally, air excess coefficients increase but exhaust gas temperature decreases when using ethanol and DEE blends. Although ethanol blend causes decrements in engine power and torque, DEE blends give closer values to diesel fuel. Both ethanol and DEE blends yield improvement in brake thermal efficiency and reduction in brake specific fuel consumption. When using fuel blends, generally, decrements in NOx and CO2 emissions and increments in HC emission occur, while CO emission shows fluctuations depending on engine load.
- Derleme MakaleYalnız künye2018A Review Study on the Using of Diethyl Ether in Diesel Engines: Effects on Fuel Properties and Engine Performance
Sezer, İsmet
This study was compiled from the results of various researches performed on using diethyl ether as a fuel or fuel additive in diesel engines. Three different techniques are used the reduction of the harmful exhaust emissions of diesel engines. The first technique for the reduction of harmful emissions is improved the combustion by modification of engine design and fuel injection system, but this process is expensive and time consuming. The second technique is the using various exhaust gas devices like catalytic converter and diesel particulate filter. However, the use of these devices affects negatively diesel engine performance. The final technique to reduce emissions and also improve diesel engine performance is the use of various alternative fuels or fuel additives. The major pollutants of diesel engines are oxides of nitrogen (NOx) and particulate matter (PM). It is very difficult to reduce NOx and PM simultaneously in practice. The most researches declare that the best way to reduce is the use of various alternative fuels i. e. natural gas, biogas, biodiesel or using the additives with alternative fuels or conventional diesel fuel. Therefore, it is very important that the results of various studies on alternative fuels or fuel additives are evaluated together to practice applications. Especially, this study focus on the use diethyl ether in diesel engines as fuel or fuel additive in various diesel engine fuels. This review study investigates the effects of diethyl ether addition on the fuel properties and performance characteristics.
- MakaleYalnız künye2017EXPERIMENTAL INVESTIGATION THE EFFECTS OF ETHANOL AND DIETHYL ETHER ADDITION INTO DIESEL FUEL ON ENGINE PERFORMANCE AND EXHAUST EMISSIONS
Sezer, Ismet
In this study, effects of ethanol and diethyl ether addition into diesel fuel on the performance and emissions of a diesel engine were experimentally investigated. A commercial diesel fuel and three different blends prepared with 15% ethanol, 15% ethanol and 2% diethyl ether and 15% ethanol and 4% diethyl ether were used in the tests. The experiments were performed at an engine speed of 1500 rpm and under various loads by using a single cylinder direct injection diesel engine. The injection, combustion, performance and emissions parameters were evaluated for baseline fuel and blends. The results show that, the injection pressure decreases for all blends, and diethyl ether addition causes a delay in the injection timing. The burnt mass fraction is lower for ethanol and diethyl ether blends during early combustion phase, while it increases for diethyl ether blends during the progressive combustion phase. Ethanol and diethyl ether blends also give the reductions in the cylinder pressure and temperature. Air excess coefficient increases the rate by 9.3-10.4%, but exhaust gas temperature decreases the rate by 4.8-5.5% when using ethanol and diethyl ether blends. Although ethanol blend causes a decrement of 1.4% in engine power, reductions in engine power are between 0.3% and 1.1% for diethyl ether blends. Both ethanol and diethyl ether blends yield increments the rate by 14.7-17.2% in brake thermal efficiency and a reduction of 8.5% in brake specific fuel consumption. The reductions were obtained the rate by 6.8-18.2% for NOx and 10.3-13.8% for CO2 emissions, when using the blended fuels. Ethanol and diethyl ether blends cause the increments the rate by 5-12.5% for HC emission, while CO emission fluctuates depending on the engine load.
- MakaleYalnız künye2016Therotical investigation of the effects of diesel fuel, biodiesel fuel and their blends on internal combsution engines
Sezer, Ismet
In this study; the effects of diesel fuel, the soybean oil methyl ester (SOME) biodiesel fuel and their blends at various percentages on the spray and combustion characteristics and engine performance and exhaust emissions of diesel engines investigated as theoretically. For this purpose, a model has been built for a direct injection diesel engine in a commercial vehicle by the Diesel-RK software program that can be used liberally on the net. The obtained values for diesel (D) and biodiesel (BD) fuels and D-BD fuel blends via the constructed model were compared. The results of the study show that BD fuel generally provides a close brake thermal efficiency values to diesel fuel. Additionally, BD fuel causes decrements in engine power and particulate matter (PM-soot) emission and increments in specific fuel consumption and nitric oxides (NOx) emission. On the other hand, D-BD fuel blends at various blend ratios have usually given the spray, combustion, performance, and emission values between those of diesel and biodiesel fuels.
- Yüksek Lisans TeziAçık Erişim2015Yenilenebilir alternatif yakıtların dizel motorlarda kullanımının performans ve emisyonlar üzerindeki etkilerinin incelenmesi
Aytekin Hoçur
Dizel motorları yüksek verim ve yüksek moment, artan devir sayıları, dayanıklılık ve benzin motorlarına kıyasla daha düşük karbon monoksit (CO) ve hidrokarbon (HC) emisyonu salınımı gibi üstünlükleri sebebiyle özellikle hafif karayolu taşıtlarında son yıllarda daha yaygın kullanılmaya başlanmıştır. Ancak, dizel motorları özellikle petrol kökenli yakıtlar kullanıldığında yüksek oranda azot oksit (NOx), is ve partikül madde (PM) emisyonu üretirler. Dizel motorlarında yakıt ekonomisi sağlamak ve zararlı egzoz emisyonlarını azaltmak için çeşitli yöntemler uygulanmaktadır. Bu yöntemler içinde konvansiyonel yakıtların özelliklerinin iyileştirilmesi amacıyla içerisine belirli oranlarda çeşitli alternatif yakıtların katılması ve konvansiyonel yakıtların yerine özellikle yenilenebilir alternatif yakıtların kullanımı kirletici emisyonlarının azaltılması ve gelecekteki enerji ihtiyacının karşılanması için umut verici bir çözüm olarak görülmektedir. Dizel motorlarda alternatif yakıt olarak kullanılabilecek yakıtlar arasında doğalgaz, hidrojen, biyogaz, biyodizel, alkoller ve çeşitli sentetik yakıtlar sayılabilir. Ayrıca motorinin özelliklerini iyileştirmek amacıyla özellikle içeriğinde oksijen bulunan metanol, etanol gibi alkoller, biyodizel ve çeşitli eterler dizel yakıtına belirli oranlarda katılabilmektedir. Bu çalışmada dizel motorlarda kullanılmaya elverişli çeşitli yenilenebilir alternatif yakıtların saf olarak ve motorine karıştırılarak kullanılmasının motor performansı ve egzoz emisyonlarına etkileri teorik ve deneysel olarak incelenmiştir. Anahtar Kelimeler: Dizel motorlar, Egzoz emisyonları, Motor performansı, Oksijenatlar, Yenilenebilir alternatif yakıtlar
- MakaleYalnız künye2011Thermodynamic, performance and emission investigation of a diesel engine running on dimethyl ether and diethyl ether
Sezer, Ismet
This study investigates the use of dimethyl ether and diethyl ether in diesel engines as alternative fuels. A direct injection diesel engine was simulated via a thermodynamic cycle model for investigation. Thermodynamic and performance parameters besides emissions determined and compared for diesel, dimethyl ether and diethyl ether fuels at two different states. The results showed that dimethyl ether and diethyl ether presented a lower cylinder temperature and pressure, and thus a lower engine performance than diesel fuel for the equal injection conditions. The brake power declines about 32.1% and 19.4% at 4200 rpm while brake specific fuel consumption increases about 47.1% and 24.7% at 2200 rpm for dimethyl ether and diethyl ether, respectively. Engine performance for dimethyl ether and diethyl ether extensively improves for the same equivalence ratio condition, but a more amount of fuel is needed about 64% for dimethyl ether and 32% for diethyl ether. The gains in the brake power by dimethyl ether and diethyl are about 13.6% and 6% at 4200 rpm compared to diesel fuel. The brake specific fuel consumption is also higher about 43.5% for dimethyl ether and 23.6% for diethyl ether than diesel fuel. The brake thermal efficiency for dimethyl ether and diethyl is generally better than diesel fuel. The lower carbon dioxides are obtained by dimethyl and diethyl ethers at all conditions, while carbon monoxide and nitrogen oxide are slightly higher for dimethyl and diethyl ethers at equal equivalence ratio condition. (C) 2011 Elsevier Masson SAS. All rights reserved.
