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YILMAZ, İLKER TURGUT

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İLKER TURGUT

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Now showing 1 - 4 of 4
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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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    Effects of hydrogen enrichment on combustion characteristics of a CI engine
    (PERGAMON-ELSEVIER SCIENCE LTD, 2017) DEMİR, ABDULLAH; Yilmaz, I. T.; Demir, A.; Gumus, M.
    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 was send into intake manifold by using a mixing chamber. Flow rates of hydrogen were 20 lpm and 40 lpm for achieving constant speed of 1750 rpm at 50 Nm, 75 Nm and 100 Nm engine loads (EL). Results showed that maximum cylinder pressures (CPs), rate of pressure rises (ROPRs) and ignition delays (IDs) raised, rate of heat releases (ROHRs) decreased and combustion durations (CDs) extended with hydrogen addition. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Investigation of the effect of biogas on combustion and emissions of TBC diesel engine
    (ELSEVIER SCI LTD, 2017) YILMAZ, İLKER TURGUT; Yilmaz, I. T.; Gumus, M.
    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 pistons were coated with 400 mu m thickness 8% yttria stabilized zirconia main coat over a 100 mu m thickness Ni-Al bond coat using atmospheric plasma spray method. Combustion (cylinder gas pressure, rate of pressure rise), heat release (rate of heat release, cumulative heat release, duration and center of heat release) exhaust emission (HC, NOx and smoke emissions) parameters were investigated. Results showed that homogenous mixture of gaseous fuel and air caused high cylinder pressures. TBC can be used for decreasing smoke emissions under dual-fuel (biogas-diesel) mode. TBC had not a significant effect on NOx emission of single fuel mode. (C) 2016 Elsevier Ltd. All rights reserved.
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    Effects of hydrogen addition to the intake air on performance and emissions of common rail diesel engine
    (PERGAMON-ELSEVIER SCIENCE LTD, 2018) YILMAZ, İLKER TURGUT; Yilmaz, I. T.; Gumus, M.
    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 tests. The cylinder pressures, rate of heat releases (ROHRs), brake specific energy consumptions (BSECs), brake thermal efficiencies (BiEs), exhaust gas temperatures (EGTs), and exhaust emissions were investigated under 50 Nm, 75 Nm and 100 Nm engine loads at 1750 rpm. Diesel fuel was injected directly to combustion chamber while hydrogen was continuously inducted into the intake manifold at two different flow rates while the original settings of the engine's electronic control unit were preserved. Results showed that hydrogen enrichment decreased HC and CO2 emissions and ROHRs, and increased EGTs and cylinder pressures under all conditions we tested. NOx emissions decreased with a 20 lpm flow rate and increased with a 40 lpm flow rate. Hydrogen also had a positive effect on BSEC and BTE, especially with low engine loads. Overall, hydrogen enrichment increases efficiency and reduces carbon-based emissions, all without major engine modifications. (C) 2017 Published by Elsevier Ltd.