Yazar "Dogan, Oguzhan" seçeneğine göre listele

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    Effect of a semi electro-mechanical engine valve on performance and emissions in a single cylinder spark ignited engine
    (Zhejiang Univ, 2010) Ozdalyan, Buelent; Dogan, Oguzhan
    In this study, an electro-mechanical valve (EMV) system for the intake valve of a four stroke, single cylinder, overhead valve and spark ignition (SI) engine was designed and constructed. An engine with the EMV system and a standard engine were tested to observe the effects of the EMV on engine performance and emissions at different speeds under full load. The EMV engine showed improved engine power, engine torque and break specific fuel consumption (BSFC). A 66% decrease in CO emissions was also obtained with the EMV system, but hydrocarbons (HC) and NOx emissions increased by 12% and 13% respectively.
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    The effect of tire derived fuel/diesel fuel blends utilization on diesel engine performance and emissions
    (Elsevier Sci Ltd, 2012) Dogan, Oguzhan; Celik, M. Bahattin; Ozdalyan, Bulent
    The aim of the present study is to evaluate the effect of tire-derived fuel (TDF) on engine performance and exhaust emissions in a diesel engine. For this aim, the raw tire derived pyrolytic oil was refined and six test fuels, TDF10 (contains 10% tire derived fuel and 90% diesel fuel in volume basis), TDF30, TDF50, TDF70, TDF90 and neat diesel fuel, were prepared to test in a diesel engine. Tests were performed in a single cylinder, four stroke, unmodified, and naturally aspirated DI high speed diesel engine at full load and four engine speeds (1400 rpm, 2000 rpm, 2600 rpm, and 3200 rpm) by using six test fuels. The experimental test results showed that the DI diesel engine can run with the TDF fuel blends up to TDF90. The smoke opacity, unburned hydrocarbon, and carbon monoxide emissions reduced while nitrogen oxides emissions increased with the increasing TDF content in the fuel blends. In addition, TDF fuel content in the fuel blends does not have a significant impact on the engine output torque, the engine power, brake specific fuel consumption (BSFC) and brake thermal efficiency (BTE) with respect to those of the reference diesel fuel. (C) 2011 Elsevier Ltd. All rights reserved.
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    EFFECTS OF LPG PERCENTAGE TO PERFORMANCE AND EXHAUST EMISSIONS IN A DUAL FUEL ENGINE
    (Gazi Univ, Fac Engineering Architecture, 2010) Aktas, Abdurrazzak; Dogan, Oguzhan
    In this study, an experimental investigation was presented to determine the effects of various ratios of Liquefied Petroleum Gas (LPG), containing 30% propane and 70% butane, on the performance and exhaust emission in a dual fuel engine with direct injection. The tests were performed at maximum torque speed of 2600 rpm with a various loads of maximum torque (20%, 40%, 60%, 80% and 100%) by using pure diesel fuel or dual fuel containing 20%, 40%, 60%, 80% and 90% of LPG. The test results showed that the smoke and Nitrogen oxide (NOx) emissions decrease, while carbon monoxide (CO) and hydrocarbon (HC) emissions increase at all mixtures of LPG and diesel fuel. Brake specific fuel consumption (bsfc) decreases by 3.5-15% with 40% LPG while the load increases. Exhaust gas temperatures at the mixture fuel were lower than that of diesel fuel in general. It was concluded that LPG can be used with diesel fuel as a mixture up to 40-60% of LPG, provided that CO and HC emissions can be lowered.
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    The influence of n-butanol/diesel fuel blends utilization on a small diesel engine performance and emissions
    (Elsevier Sci Ltd, 2011) Dogan, Oguzhan
    Nitrogen oxides and smoke emissions are the most significant emissions for the diesel engines. Especially, fuels containing high-level oxygen content can have potential to reduce smoke emissions significantly. The aim of the present study is to evaluate the influence of n-butanol/diesel fuel blends (as an oxygenation additive for the diesel fuel) on engine performance and exhaust emissions in a small diesel engine. For this aim five-test fuels, B5 (contains 5% n-butanol and 95% diesel fuel in volume basis), B10, B15, B20 and neat diesel fuel, were prepared to test in a diesel engine. Tests were performed in a single cylinder, four stroke, unmodified, and naturally aspirated DI high speed diesel engine at constant engine speed (2600 rpm) and four different engine loads by using five-test fuels. The experimental test results showed that smoke opacity, nitrogen oxides, and carbon monoxide emissions reduced while hydrocarbon emissions increased with the increasing n-butanol content in the fuel blends. In addition, there is an increase in the brake specific fuel consumption and in the brake thermal efficiency with increasing n-butanol content in fuel blends. Also, exhaust gas temperature decreased with increasing n-butanol content in the fuel blends. (c) 2011 Elsevier Ltd. All rights reserved.