4 results listed
Abstract: Researches have focused on alternative fuels to reduce climate change and greenhouse gas emissions. In addition, concerns about environmental pollution from the widespread consumption of traditional fossil fuels have increased to studies on environmentally and renewable fuels. Such as biodiesel and alcohol biofuels are proposed as alternative fuels for internal combustion engines. Some alcohols and their derivatives fuels which contains oxygen, can be mixed with petroleum-derived fuels at certain ratios. This is seen as an effective way of reducing emissions and conventional fuel consumption without changing engine design. In this study, 8% and 16% by volume of n-hexadecane was added to biodiesel fuel which is produced by transesterification from canola oil. As the nhexadecane ratio increases in the canola biodiesel, the specific fuel consumption decreases while the torque increases at all 1/min. At 1400 1/min, which maximum torque is obtained, the torque increased by 8.40%, the specific fuel consumption decreased by 7.99% in KHD16 fuel compared to K0 fuel. Compared K0 fuel, at 1400 1/min, the CO emission was 1.74%, HC emission was 17.34% and the soot emission was 24.34% decreased , while the NOx emission increased by 1.15% in KHD16 fuel.
Özet: İklim değişikliği ve sera gazı emisyonlarının azaltılması için araştırmalar alternatif yakıtlar üzerine yoğunlaşmıştır. Ayrıca geleneksel fosil yakıtların yaygın olarak tüketiminden kaynaklanan çevre kirliliği konusunda ki endişeler çevre dostu ve yenilenebilir yakıtlar üzerine çalışmaları arttırmıştır. Biyodizel ve alkol gibi biyoyakıtlar, içten yanmalı motorlar için alternatif yakıt olarak önerilmektedir. Bazı alkoller ve bunların türevi olan oksijen içerikli yakıtlar, petrol türevli yakıtlara belirli oranlarda karıştırılarak kullanılabilmektedir. Bu durum motor tasarımında değişiklik yapılmadan emisyonları ve konvansiyonel yakıt tüketimini azaltmanın etkili bir yöntemi olarak görülmektedir. Bu çalışmada kanola yağından transesterifikasyon yöntemiyle üretilen biyodizel yakıtı içerisine hacimce %8 ve %16 oranlarında n-hexadecane ilave edilmiştir. Kanola biyodizeli içerisinde n-hexadecane oranının artmasıyla tüm devirlerde moment artarken özgül yakıt tüketimi azalmıştır. Maksimum momentin elde edildiği 1400 1/min’de K0 yakıtına göre KHD16 yakıtında moment %8.40 artmış, özgül yakıt tüketimi %7.99 azalmıştır. 1400 1/min’de K0 yakıtına göre KHD16 yakıtında CO emisyonu %1.74, HC emisyonu %17.34 ve is emisyonu %24.34 azalırken, NOx emisyonunun %1.15 arttığı görülmüştür.
International Combustion Symposium
INCOS2018
Mehmet Celik
Cihan Bayindirli
Mehmet Demiralp
Murat Ciniviz
In this study, biodiesel produced from safflower oil was used in a diesel engine as pure fuel. It aimed that the presented availability as a diesel fuel of biodiesel. Results presented as engine performance (torque and specific fuel consumption), exhaust emissions (CO, CO2, HC, NOx and smoke opacity), and combustion analysis. According to test results performed at different injection pressures, biodiesel provided a good engine performance at high injection pressure. Similarly, its exhaust emissions which are already good (expected NOx emission) were better due to the increase injection pressure. Biodiesel increased NOx emission at all conditions. Combustion analysis results shown that it has similar combustion characteristics with diesel fuel. Besides, although ignition delay of biodiesel shortened, its combustion duration extended.
International Combustion Symposium
INCOS2018
Murat Ciniviz
Ilker Ors
Ali Kahraman
Bahar Sayin Kul
Abstract: In this study, a single cylinder, 4-stroke, spark ignition Otto cycle engine was converted to Atkinson cycle and performance variations were investigated. The engine is converted to Atkinson cycle engine via late intake valve closing timing and increasing the compression ratio. Torque, power, thermal efficiency and specific fuel consumption variations with engine speed were obtained experimentally at wide open throttle without any modification. Thermodynamic analysis was performed for Otto and Atkinson cycle operation of the engine and the theoretical values were compared with experimental values.
Özet: Bu çalışmada, tek silindirli, dört zamanlı, buji ile ateşlemeli Otto çevrimine göre çalışan bir motorun Atkinson çevrimine göre dönüşümü ve performans değişimleri incelenmiştir. Motorun emme supabı kapanma zamanlaması geciktirilerek ve sıkıştırma oranı arttırılarak Atkinson çevrimine dönüşümü yapılmıştır. Motorda dönüşüm yapılmadan tam gaz kelebek açıklığında devre bağlı deneysel olarak elde edilen moment, güç, termik verim ve özgül yakıt tüketimi değerleri, Otto ve Atkinson çevrimi için termodinamik analiz ile elde edilen değerlerle mukayese edilmiştir.
International Combustion Symposium
INCOS2018
Halil E. Gulcan
Abdullah O. Ozdemir
Can Cinar
Murat Ciniviz
In this study, effects on engine performance, combustion analysis and exhaust emissions of a ternary fuel blend (diesel-biodiesel-bioethanol) were investigated at different injection pressure in a diesel engine which has single cylinder and direct injection. According to test results, although biofuels decreased engine performance, this negative effect improved noteworthy owing to increased injection pressure. However, both biodiesel and bioethanol increased heat release rate at all conditions. The low cetane number of bioethanol increased ignition delay at all injection pressure. Ternary fuel decreased CO and smoke opacity emissions, although bioethanol and biodiesel increased HC and NOx emissions respectively. Besides, both biodiesel and bioethanol increased exhaust gas temperature at especially high injection pressure.
International Combustion Symposium
INCOS2018
Ilker Ors
Ali Kahraman
Murat Ciniviz
Bahar Sayin Kul