Person: SAYIN, CENK
Loading...
Email Address
Birth Date
Research Projects
Organizational Units
Job Title
Last Name
SAYIN
First Name
CENK
Name
4 results
Search Results
Now showing 1 - 4 of 4
Publication Open Access Effects of supercharge pressure on combustion characteristics of a diesel rngine fueled with alcohol–diesel blends(2023-01-01) SAYIN, CENK; Vargün M., Özsezen A. N., Türkcan A., Sayın C., Kılıçaslan İ.© 2023, King Fahd University of Petroleum & Minerals.The recent increase in diesel prices is the most crucial factor that maintains alternative fuel research on the agenda in diesel engines. This study aims to analyze the combustion characteristics of ethanol–butanol–diesel triple-fuel mixtures and to investigate the effects of the boost pressure in a single-cylinder diesel engine. In the engine test, while the boost pressure at 1600 rpm was fixed at 240 mbar, the intake air pressure gauge was increased to 264, 228, and 312 mbar. As a result of the study, the most prolonged combustion duration in all test conditions was obtained using pure fossil diesel fuel. More than a 10% increase in ignition delay times has been calculated for blends. In addition, significant increases were observed in the heat release rate as the alcohol content in the blends increased. While considerable reductions in CH4, CO, and CO2 emissions were monitored by using the alcohol–diesel mixtures with the increased boost pressure, the stable formation in NOx emissions was not observed. Moreover, there was a significant increase in combustion noise with alcohol–diesel blends.Publication Open Access Investigation of performance, combustion and emission characteristics in a diesel engine fueled with methanol/ethanol/nHeptane/diesel blends(2022-10-01) VARGÜN, MUSTAFA; SAYIN, CENK; YILMAZ, İLKER TURGUT; Vargün M., Yılmaz İ. T., Sayın C.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-based diesel fuel. The effects on engine performance, combustion and exhaust emission characteristics were investigated in a diesel engine with a 4-cylinder common rail injection system, at different engine loads (40 Nm and 80 Nm) and different engine speeds (1500 rpm, 1600 rpm, 1700 rpm and 1800 rpm). The maximum brake thermal efficiency (BTE) value was obtained as 43% with diesel-methanol (M20) mixed fuel at 1800 rpm at 80 Nm engine load. Brake specific fuel consumption (BSFC) values improved in all fuel types with the increase in engine load. In all test conditions, the highest maximum cylinder gas pressure (CPmax) value was obtained with M20 fuel as 114.3 bar, while the highest cumulative heat release (CHRmax) value was determined as 811.7 J with diesel-nheptane (H20) fuel. Compared to diesel fuel (D100), the use of alcohol-diesel fuel mixtures resulted in longer ignition delay (ID) and shortened combustion duration (CD). In general, a significant reduction in carbon dioxide (CO2) emissions has been observed with the use of blended fuels. As a result of the increase in engine the load, a decrease in HC emissions was observed for all test fuels. When compared to D100 fuel, oxygen (O-2) and nitrogen oxide (NO) emissions were increased with the use of diesel-methanol (M20) and diesel-ethanol (E20) fuels, while O-2\ and NO emissions were decreased with the use of diesel-nheptane fuel. (C) 2022 Elsevier Ltd. All rights reserved.Publication Metadata only Operational evaluation of thermal barrier coated diesel engine fueled with biodiesel/diesel blend by using MCDM method base on engine performance, emission and combustion characteristics(PERGAMON-ELSEVIER SCIENCE LTD, 2020) SAYIN, CENK; Erdogan, Sinan; Aydin, Selman; Balki, Mustafa Kemal; Sayin, CenkIn this study, engine operating conditions which given the best result in terms of performance, exhaust emission and combustion characteristics in a thermal barrier coated (TBC) diesel engine, which was covered with ceramic on combustion chamber elements, were determined by multi-criteria decision-making (MCDM) method. It was also included in the optimization of the data obtained from the uncoated (standard) engine (STD) in order to better evaluate the TBC engine. In the experimental study, diesel, pure biodiesel derived from cotton oil frying waste and biodiesel/diesel blend fuels (5, 20 and 50% by volume) were used as fuel. In optimization, operational competitiveness rating (OCRA) was preferred as a MCDM. The experimental data, which included a total of six hundred data, in TBC and STD engines fueled biodiesel and its blends were used in optimization. According to the optimization result, the best results in terms of engine performance, exhaust emission and combustion characteristics were generally obtained from the TBC engine. According to the optimization sequence, the ranking obtained from the TBC engine were observed to be ahead of the STD engine at all engine speeds. It was also found that the best results were concentrated at engine speeds of 1800 rpm and 2100 rpm. The best result was achieved by using B20 (20% biodiesel + 80% diesel) in TBC engine at 1800 rpm. The performance, emission and combustion characteristics obtained under these optimum operating parameters (OOP) were also compared with those of the STD engine fueled with B0 and B100. (C) 2019 Elsevier Ltd. All rights reserved.Publication Open Access Experimental investigation of combustion and exhaust emission values in a diesel engine using ethanol-butan-2-ol-diesel fuel blends(2022-09-01) VARGÜN, MUSTAFA; SAYIN, CENK; Vargün M., Özsezen A. N., Hürpekli M., Sayın C.Ethanol and petroleum-based diesel fuel (PBDF) blends have been extensively tested on diesel engines as an alternative fuel without the use of any co-solvents. However, there is not enough information about the combustion noise and products of CO2, CH4 and NH3 that are sourced from 2-butanol used as co-solvent to prevent phase separation between ethanol and PBDF. The present study aims to investigate the effect of ethanol-butan-2-ol-diesel fuel blends on combustion phenomenon and CO2, CH4 and NH3 emission characteristics under different operating conditions of diesel engine. In this study, homogeneity of ethanol and PBDF fuel mixture was achieved by using butan-2-ol (2-butanol). First, engine tests were conducted with the base calibration strategy of injection timing. Later, the tests were conducted by advancing and retarding injection timing to observe the effects of the injection timing on the combustion and emission at different engine speeds. The test results showed an increase in combustion noise with the use of alcohol-PBDF blends. In the tests, the maximum combustion noise was monitored as 92.7 dB with the use of E10B2 at the engine speed of 1400 rpm. It was observed that the use of alcohol-PBDF fuels was much more effective in reducing NH3 and CO emissions according to the change in fuel injection timing. In the tests, 50% or more reduction in CO and NH3 emissions was observed with the use of alcohol-PBDF fuel blends. It was noted that engine speed was more effective than both alcohol-PBDF blends and injection timing on the formation of CO2 emissions. It was observed that delaying the fuel injection time is more effective on NOx emissions than the use of ethanol-PBDF mixture. Moreover, it was observed that increasing ethanol ratio in fuel blend led to increase in in-cylinder gas pressure due to longer ignition delay that enables more time to fuel and air to mixture. The longest ignition delay was calculated as 9.2 degrees CA in use of E15B3 fuel at 1400 rpm.