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    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) Erdogan, Sinan; Aydin, Selman; Balki, Mustafa Kemal; Sayin, Cenk
    In 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.
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    Performance, emission and combustion characteristic assessment of biodiesels derived from beef bone marrow in a diesel generator
    (Pergamon-Elsevier Science Ltd, 2020) Erdogan, Sinan; Balki, Mustafa Kemal; Aydin, Selman; Sayin, Cenk
    This paper discusses the performance, exhaust emissions and combustion of a diesel generator fueled with two different biodiesels, and their blends. In the experiments, animal fat biodiesel (AFB) obtained from beef bone marrow, vegetable oil biodiesel (VOB) derived from safflower/canola oil mixture, and ultra-low-sulfur diesel (ULSD) were used as pure. In addition, 50% by volume of AFB was mixed with ULSD (AFB50), and 50% by volume of VOB was mixed with ULSD (VOB50). All engine tests were conducted at a constant engine speed of 1500 rpm for three different diesel generator loads (3.6, 7.2, and 10.8 kW). According to the results, when the AFB and its blend were used as fuel in a diesel generator, it was determined that cylinder gas pressure (CP) and net heat release rate (HRR) values were higher, and raised earlier in all loads compared with VOB and ULSD. Moreover, the values of mean gas temperature (MGT) and exhaust gas temperature (EGT) were increased with the use of AFB compared to other test fuels, whereas thermal efficiency (TE), carbon monoxide (CO) and hydro carbon (HC) emission decreased in general. The carbon dioxide (CO2) emission was also higher than ULSD, but remained lower than VOB. The nitrogen oxide (NOx) emission was found to show a similar change in all types of fuel. (C) 2020 Elsevier Ltd. All rights reserved.
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    The best fuel selection with hybrid multiple-criteria decision making approaches in a CI engine fueled with their blends and pure biodiesels produced from different sources
    (Pergamon-Elsevier Science Ltd, 2019) Erdogan, Sinan; Balki, Mustafa Kemal; Aydin, Selman; Sayin, Cenk
    In engine tests where the feasibility of alternative fuels is being investigated, the results of the engine performance, combustion characteristics, and exhaust emissions should be considered as a whole. It is difficult to determine the optimal parameters due to a large number of results obtained in multi-variable experiments. Multi-criteria decision making (MCDM) methods are preferred in solving such problems to energy management and energy efficiency. This paper deals with an application of a novel hybrid MCDM technique is suggested to select the optimum fuel for the compression ignition (CI). Five academicians who are an expert in the field of CI engines are selected to set criteria in the MCDM. Engine tests carried out at the constant engine speed and the resistive load of 10.8 kW in the generator-engine set. The results were used in the MCDM process. In this study, the hybrid models which are SWARA-MOORA, and ANP-MOORA has been preferred as the MCDM methods. The best fuel choice was made from fuels such as animal fat biodiesel (AFB), vegetable oil biodiesel (VOB), diesel fuel and the blend fuels. According to results, it was determined that the best fuel is VOB20 in both hybrid methods according to the determined criteria. (C) 2018 Elsevier Ltd. All rights reserved.
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    The optimization of engine operating parameters via SWARA and ARAS hybrid method in a small SI engine using alternative fuels
    (Elsevier Sci Ltd, 2020) Balki, Mustafa Kemal; Erdogan, Sinan; Aydin, Selman; Sayin, Cenk
    In most countries, mandatory emission norms have been established to reduce greenhouse gas emissions. In addition, the production and use of diesel engines with high emissions have been prohibited in some countries. For this reason, spark ignition (SI) engines have become important. Research on the use of renewable energy sources and the development of energy-efficient engines is increasing in terms of sustainability. It is known that alcohol fuels with high knock resistance than gasoline generate higher engine efficiency under different engine operating conditions. In this study, it is determined that the optimum operating parameters of an SI engine fueled with pure ethanol and methanol as an alternative fuel in terms of performance, emission and combustion characteristics. The engine tests were used an air-cooled and single-cylinder small SI engine. The engine has been set to three different ignition timing/advance (IT), compression ratio (CR) and air excess coefficient (AEC), and tested in varied combinations. In a total of eighty-one different test conditions, the engine was operated at the full-throttle opening and at engine speed at 2400 rpm with test fuels, and then performance emission and combustion data were obtained. The optimal operating parameters are determined with a multi-criteria decision-making method (MCDM) using a total of seven hundred twenty-nine experimental data. For this purpose, SWARA-ARAS (Step-wise Weight Assessment Ratio Analysis-Additive Ratio Assessment) hybrid method is preferred. According to the results, the optimum working parameters were found to be 9.0:1 of CR, 1.1 of AEC, and 20 degrees crankshaft angle (CA) of IT in the use of pure methanol fuel. In addition, the top ten rankings entering the operating parameters are presented in the article. (C) 2020 Elsevier Ltd. All rights reserved.