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Öğe Investigation of the usability of biodiesel obtained from residual frying oil in a diesel engine with thermal barrier coating(Journals & Books, 2015-04-05) Aydın, Hüseyin; Sayın, Cenk; Aydın, SelmanIn this study, biofuel was produced from residual frying oil of cottonseed and D2, B5 and B100 fuels were prepared in order to use in experiments. These fuels were tested in a single cylinder, four strokes, 3 LD 510 model Lombardini CI engine. Then the top surfaces of the piston and valves were coated with plasma spray coating method by using 100 μm of NiCrAl as lining layer and over this layer the same surfaces were coated with 400 μm of the mixture that consists of %88 ZrO2, %4 MgO and %8 Al2O3. After the coating process, above mentioned fuels were tested in the coated engine. Previously, same fuels had been tested in uncoated engine, at full load and various speeds. Performance, emission and combustion experiments were carried out in coated engine. By coating process, partial increases were observed in power, exhaust manifold temperature and engine noise, while partial decreases were seen in brake specific fuel consumption (Bsfc). Besides, partial reductions were found in carbon monoxide (CO), hydrocarbon (HC) and smoke opacity emissions, but partial increases were observed in nitrogen oxide (NOx) emissions. Cylinder gas pressure values were higher for coated engine. Moreover, heat releases were close to each other in both engines.Öğe Combustion behavior of DME with biodiesel usage in a diesel engine powered generator at idle and medium loads(İstanbul Teknik Üniversitesi, 2016-10) Aydın, HüseyinThe effects of using dimethyl ether (DME) on the combustion parameters of biodiesel in a diesel engine 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), B75DME75 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 al 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.Öğe Effects of thermal barrier coating on the performance and combustion characteristics of a diesel engine fueled with biodiesel produced from waste frying cottonseed oil and ultra-low sulfur diesel(Taylor & Francis, 2016-09-01) Aydın, Selman; Sayın, Cenk; Altun, Şehmus; Aydın, HüseyinIn this study, the top surfaces of piston and valves of a four-strokes and direct-injection diesel engine have been coated—with no change in the compression ratio—with a 100 μm of NiCrAl lining layer via plasma spray method and this layer has later been coated with main coating material with a mixture of 88% of ZrO 2 , 4% of MgO and 8% of Al 2 O 3 (400 μm). Then, after the engine-coating process, ultra-low sulfur diesel (ULSD) as base fuels and its blend with used frying cottonseed oil derived biodiesel in proportion of 20%, volumetrically, have been tested in the coated engine and data of combustion and performance characteristics on full load and at different speeds have been noted. The results, which were compared with those obtained by uncoated-engine operation, showed that thermal efficiency increased, and engine noise reduced. Cylinder gas pressure values obtained from the diesel engine which has been coated with thermal barriers have been found to be somewhat higher than those of the uncoated-engine. Also, maximum pressure values measured in both engines and under the same experimental conditions through the use of test fuel have been obtained after TDC. Moreover, heat release rate and heat release have occurred earlier in the coated-engine. NOx emissions were increased while CO and HC emissions were remained almost the same with a little bit decrease.Öğe 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 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 Seramik kaplı bir dizel motorunda biyodizel kullanımının emisyon parametrelerine etkisinin deneysel olarak araştırılması(Makine Teknolojileri Elektronik Dergisi, 2015) Aydın, Hüseyin; Sayın, Cenk; Aydın, Selman; İşcan, Bahattin; Işık, Mehmet ZerakkiBu çalışmada, dört silindirli, dört zamanlı bir dizel motor plazma sprey yöntemi ile 100 μm NiCrAl astar tabaka ve bu tabakanın üzerine 400 μm olmak üzere ZrO2 , %4 MgO ve %8 Al2O3 ana kaplama malzemesi ile kaplanmıştır. Bu motorda, seramik kaplama yönteminin yanma ve emisyon parametreleri üzerindeki etkileri araştırılmıştır. Deneysel çalışmalarda kullanılmak üzere pamuk yağı kökenli atık kızartma yağından üretilen biyodizel, dizel yakıtı ile %20 ve %50 oranında karıştırılarak sırası ile (B20) ve (B50) yakıtları oluşturulmuştur. Bu yakıtlar ile normal dizel (D2) yakıtı motor testlerinde kullanılmıştır. Deneyler kısmi yükte olmak üzere emisyon değerleri için 1200, 1500, 1800, 2100 ve 2400 dev/dk’da gerçekleştirilmiştir. Deneysel çalışma sırası ile D2, B20 ve B50 yakıtları ile önce kaplanmamış motorla egzoz emisyonları değerleri alınmıştır. Çalışma boyunca elde edilen sonuçlar ve belirgin avantajlar burada sunulmuştur
