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Öğe Investigation of the effect of colorless distributed combustion method on the flame of methane/hydrogen fuel mixture using image processing method(Hydrogen Energy Publications LLC. Published by Elsevier Ltd., 2025) Alabas, Bugrahan; Kumuk, OsmanIn a period when zero-emission combustion studies are gaining importance, researchers continue their research on alternative fuels. Although different alternative fuels are tested in combustion studies, the production and storage capabilities of these fuels also affect industrial practices. For this purpose, in this study, the combustion characteristics and emission behaviors of methane gas enriched with H2 at a volumetric ratio (20%), which can be transported in existing natural gas lines without any major changes, were examined. To solve the high flame speed problem caused by the hydrogen content of the fuel mixture, colorless distributed combustion conditions were proposed, and experiments were carried out. In the experiments, thermal power (5 kW), equivalence ratio (0.7), and number of vortices (0.4) were kept constant. The flame was exposed to external acoustic forcing frequencies in experiments under different conditions, and dynamic pressure oscillations were recorded. Addi tionally, in this study, flame image processing was performed with open-source software. The results showed that increasing the N2 ratio in the oxidizing air increased the resistance to acoustic disturbances. While flame stability increased in the mixture containing 19% O2 compared to standard air combustion conditions, when the O2 rate was reduced to 18%, the flame experienced blowoff instability under strain. The change in stability varied in direct proportion to the flame thickness and length. On the other hand, while CDC combustion conditions reduced NOX emissions in flue gas to almost zero, they caused an increase in CO emissions.Öğe Flame characteristics and emission behaviors of JP8/biogas mixtures under external acoustic enforcement frequencies(Elseiver, 2025) Alabaş, Buğrahan; Taştan, Murat; Özcan, Ahmet; Amez, IsabelThe combustion of aviation fuels with high stability and low emissions is of great importance among current studies. In particular, the use of Sustainable Aviation Fuels (SAF) instead of fossil fuels is valuable both economically and in terms of climate studies. The effect of fossil fuel use on the carbon footprint has accelerated the studies. The most commonly used of these fossil fuels in the military aviation field is known as JP8 (Jet Propellant 8). In this study, the combustion behavior of JP8 fuel used in military aviation was studied. In the study carried out in the thermo-acoustic model combustion chamber, Biogas was added as an alternative fuel to JP8. Tests were carried out up to 50 % JP8 50 % Biogas ratio by increasing the biogas addition according to the thermal power meeting ratio. In the study, JP8/Biogas mixture flames were subjected to external acoustic en forcements at different frequencies and dynamic pressure changes were recorded. The results showed that the addition of Biogas increased the stability of the JP8 flame under external acoustic enforcements. As a result of the Biogas addition, a decrease in both CO (Carbon Monoxide) and NO X (Nitrogen Oxide) emissions was detected up to 33 % Biogas ratio. The addition of biogas increased the combustion chamber exit temperatures up to 93 Kelvin. In addition, in this study, image processing of the flame was carried out with an open source program. As a result of image processing, it was determined that the addition of Biogas increased the flame length and thickness.
