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Öğe Diesel engine applications for evaluation of performance and emission behavior of biodiesel from different oil stocks(Environmental Progress & Sustainable Energy, 2015-05) Aydın, Hüseyin; Behçet, Rasim; İlkılıç, Cumali; İşcan, Bahattin; Aydın, SelmanExtensive researches on alternative fuels have been carried out since the fossil-based fuels are limited. Many of these studies have ever been on the usability of vegetable oils in diesel engines. In the current work, biodiesel were produced from waste fish oil (FOB), hazelnut oil (HOB), rapeseed oil (ROB), and waste cooking oil (WCOB) by transesterification method. The same optimized variables of 6:1 methanol/oil molar ratio (mol/mol), 0.4% sodium methoxide concentration (wt.%), 60°C reaction temperature, 1000 rpm agitation speed and 2 h reaction time conditions were performed for biodiesel production from all kinds of above mentioned oils. Some of the important chemical and physical properties of test fuels were found. Without making blends with diesel fuel, pure biodiesels were used in a diesel engine in order to clarify how their usage effects on engine performance and exhaust emission parameters. When compared with those of diesel fuel, average torque and power were reduced while brake specific fuel consumption was increased for biodiesels. Besides, carbon monoxide (CO), hydrocarbon (HC) emissions were considerably lower for biodiesel usage while oxides of nitrogen (NOx) emissions were higher than that of diesel fuel. Furthermore, emissions of carbon dioxide (CO2) and smoke opacity were reduced for biodiesel usage. Oxygen (O2) contained in the exhaust gases were higher for biodiesels while they contain more oxygen molecules in their structureÖğe Yapıştırıcının mekanik özelliklerinin bulk numuneler yardımıyla belirlenmesi(e-Journal of New World Sciences Academy, 2010-07) Adin, Hamit; Turgut, Aydın; İşcan, BahattinBu çalışmamızın amacı, konstrüksiyon tasarımı için gerekli bazı yapısal yapıştırıcıların mekanik özelliklerinin belirlenmesidir. Çalışmamızda yapıştırıcı malzemelerin mekanik özelliklerini tespit etmek içim bulk numuneler kullanılmıştır. Numuneler için kalıp yapılmış, numunelerin gaz boşlukları ve süneksizlikleri giderildikten sonra deneyler yapılmıştır. ASTM çekme deney prosedürü uygulanarak yapıştırıcıların mekanik değerleri bulunmuştur. Deneyler sonucunda yapıştırıcıların elastik şekil değiştirme gösterdikleri görülmüştür.Öğe The effect of n-butanol additive on low load combustion, performance and emissions of biodiesel-diesel blend in a heavy duty diesel power generator(Elsevier, 2017-04) Işık, Mehmet Zerrakki; Bayındır, Hasan; İşcan, Bahattin; Aydın, HüseyinDiesel power generators are often used under partially load conditions. Especially, under low load conditions, it is crucial to find a solution for their considerably high brake specific fuel consumption (bsfc) and exhaust output emissions. Other points are the usability of waste cooking oil and an oxygenated alternative fuel in low load conditions of diesel generator. In this point of view, 10% n-butanol and 10% biodiesel mixture was blended with 80% of ultra low sulfur diesel fuel named here as BB20 was used and comparisons have been made with 20% biodiesel/80% diesel fuel named here as B20 and ultra low sulfur diesel fuel named here as (D2). Previously, main important physical and chemical fuel properties of test fuel have been found. These fuels were tested in low load operations of a diesel engine generator in order to find out the effects of blend fuels on combustion characteristics, performance and emissions of the test engine. The test results are presented in this paper and seem to raise quite interesting points. Butanol addition to diesel and biodiesel blends can be considered as a good solution for reducing density, viscosity and thus sustainable usability of biodiesel and increase thermal efficiency and lower carbon monoxide (CO) and oxides of nitrogen (NOx) under comparatively lower load conditions in diesel power generator engines.Öğe The effect of overlap length adhesive with bonded in Z type materials(Academic Journals, 2011-09-11) İşcan, Bahattin; Adin, Hamit; Aydın, TurgutThe usage of adhesives as connecting method is increasing rapidly in today world. Many of research, development and engineering have been made to find the most important parameters of adhesion. In this study, stress analysis of bonded Z type that connected with various adhesives has been investigated. The adhesive thickness and overlap non-angle was constant but overlap length and overlap angle were varied. This paper has deal with the effect of overlap length on predicting of failure load of adhesive. An effective method for numerical solution in finite element method (FEM) has been performed in analysis. The FEM code employed was ANSYS(10.0). Experimental results were compared with numerical results and were found quite reasonable.Öğe The effect of angle adhesive with bonded in Z type materials(e-Journal of New World Sciences Academy, 2010-03) Adin, Hamit; Turgut, Aydın; İşcan, BahattinThe usage of adhesives as connecting on method is increasing rapidly in today world. Many of research, development and engineering have been made to find the most important parameters for a success adhesion. In this study, stress analysis of Z type bonded sheet that connected with various adhesives has been investigated. The adhesive thickness was constant (0.20 mm) b lap joint length and lap joint angles (θ=15º, 30º, 45º) were varied for analysis. This study has deal with the effect of overlap angle on predicting of the damage load of adhesively bonded joints via a linear FEM(Finite Element Method). All of the analysis were carried out with Ansys (10.0) computer software with a generally purposed finite element application. Experimental results were compared with numerical results and were found quite reasonableÖğe Effects of DME addition to biodiesel on combustion, performance and emissions of a diesel engine at idle and medium loads(Makine Teknolojileri Elektronik Dergisi, 2016) Aydın, Hüseyin; İşcan, BahattinThe effects of using dimethyl ether (DME) on the combustion, performance and emission parameters of biodiesel in a diesel engine operating at idle and medium loads that was used to drive an electrical power generator were experimentally investigated. Biodiesel was produced from safflower oil. 75% of the biodiesel was blended with 25% of DME, volumetrically, which was called here as B75DME25. Pure biodiesel (B100), B75DME25 and ultra-low sulfur diesel fuel (D2) was used as test fuels. Experiments were carried out at constant loads of 60% and idle conditions. Cylinder pressure, heat release rate (HRR), cylinder pressure rise rate(CPRR) and mean gas temperature(MGT) variations of test fuels at both idle and 60% load conditions were presented here. It was found that peak values of derived pressure for all test fuel are similar while the positions of peak pressure were changed and was found earliest for D2. Similar trends were also observed for HRR, CPRR and MGT parameters. CO, HC, NOx and CO2 emission were found and compared for test fuels at both idle and medium loads. In the performance tests, brake specific fuel consumption (bsfc), mass fuel consumption and thermal efficiency values were tested and compared for test fuels.Öğe Optimization of process parameters of medium carbon steel joints joined by MIG welding using Taguchi method(European Mechanical Science, 2022-03-20) İşcan, Bahattin; Adin, Mehmet ŞükrüIn this study, related to getting better obtain to the mechanical properties of medium carbon steel joints joined by MIG welding method using the Taguchi method welding groove were optimized. Grove angle (60ᵒ, 75ᵒ and 90ᵒ), current (100 A, 110 A and 120 A) and voltage (25 V, 30 V and 35 V) were used as welding parameters. The results showed that the highest tensile strength as 597.963 MPa was obtained at groove angle 90ᵒ, current 120 A and voltage 30 V, the lowest tensile strength was obtained as 395.125 MPa. The highest elongation as 11.551% was obtained at groove angle 90ᵒ, current 120 A and voltage 30 V, the lowest elongation was obtained as 8.354%. In addition, it was observed that the changes in current and voltage values significantly affect the tensile strength and elongation values of the joints. According to ANOVA analyses, the most effective parameter on average tensile strength and elongation were determined to be groove angle (62.75% and 75.58%, respectively). Based on S/N ratios, the optimal parameters for average tensile strength and elongation were determined A3B3C2 factors.Öğe Combustion, performance, and emissions of safflower biodiesel with dimethyl ether addition in a power generator diesel engine(Taylor & Francis, 2020-04-29) Aydın, Hüseyin; Işık, Mehmet Zerrakki; İşcan, Bahattin; Topkaya, HüsnaIn this study, the effect of dimethyl ether (DME) addition to diesel (ultralow sulfur diesel fuel) and biodiesel fuels on the combustion, performance, and emissions of a diesel-powered generator was investigated. For this purpose, fuel samples of the ternary blend that volumetrically composed of 10% safflower biodiesel–10% dimethyl ether–80% ultralow sulfur diesel fuel (B10DME10), the ternary blend that volumetrically composed of 25% safflower biodiesel–25% dimethyl ether–50% ultralow sulfur diesel fuel (B25DME25), the binary blend that volumetrically composed of 25% safflower biodiesel–75% ultralow sulfur diesel fuel (B10DME10) B25, and pure safflower oil biodiesel (B100) and standard ultralow sulfur diesel (D2) were prepared. The test engine was loaded by power drawing from the generator by the usage of equivalent powered electrical heating resistances. Generally, using DME with biodiesel improved the combustion properties of biodiesel blends that can be attributed to the lower viscosity of DME. The maximum cylinder pressure was obtained for B10DME10 in general and sometimes for B25DME25. When test fuels are compared, DME blends showed higher and earlier peaks of heat release compared to diesel and biodiesel blend fuels especially. It was found that combustion is more efficient from mass fuel consumption (MFC) and brake specific fuel consumption (BSFC) values in the use of DME than biodiesel. BSEC values of using DME in the blends considerably decreased that it is the proof of improved combustion and energy efficiency. The highest average efficiency values were obtained for B25DME25 as 28.3% although it has a lower calorific value than D2 due to the considerably improved combustion properties of DME, while the average efficiency values were 23.1%, 23.3%, and 20.7% for D2, B25, and B100 fuels, respectively. Highest carbon monoxide (CO) emissions were obtained in the use of pure biodiesel, while the lowest CO emissions were obtained in the use of DME. The addition of DME is seen to increase the nitrogen oxides (NOx) and CO emissions.Öğe Improving the usability of vegetable oils as a fuel in a low heat rejection diesel engine(Elsevier, 2012-06) İşcan, Bahattin; Aydın, HüseyinUsability of a waste vegetable oil in coated diesel engines was experimentally investigated. Waste corn oil was blended with petroleum diesel fuel by ratios of 15% corn oil to %85 diesel fuel (B15), 35% corn oil to %65 diesel fuel (B35) and 65% corn oil to %35 diesel fuel (B65). The surfaces of the engine piston and both intake and exhaust valves were coated with ZrO 2 layer in order to make the combustion chamber insulated. Thus heat transfer through the combustion chamber was aimed to be reduced with the purpose of increasing the thermal efficiency and performance of the engine and also maintain the usability of vegetable oil in diesel engines. B15, B35, B65 and standard diesel fuels were used in the coated test engine. Performance parameters and exhaust emissions characteristics of all the above mentioned fuels were clarified and compared with uncoated engine test values of normal diesel fuel. It is believed that the main purpose of this study has been achieved as the engine performance parameters such as power and torque of the engine were increased with simultaneous decreases in the brake specific fuel consumption (bsfc). Besides, many of exhaust emission parameters such as CO, HC, and smoke opacity were decreased.
