Yazar "Degirmenci, Huseyin" seçeneğine göre listele

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    An experimental study on droplet-scale combustion and atomization behavior in pure ethanol, methanol, and trimethyl borate, and their blends
    (Elsevier Sci Ltd, 2024) Degirmenci, Huseyin; Kucukosman, Ridvan; Yontar, Ahmet Alper
    The combustion and atomization behavior of pure ethanol (EtOH), methanol (MeOH) and trimethyl borate (TMB) fuels and their blends prepared at 20 wt%, 40 wt%, 60 wt% and 80 wt% ratios were determined by processing videographs recorded with a high-speed camera and temperature data recorded with a thermal camera during droplet-scale combustion experiments performed at atmospheric pressure. EtOH and MeOH are good alternatives for transport due to their high oxygen content and relatively short carbon chains. TMB, an organoboron derivative in the liquid phase, is unique to creating a low-carbon emission and high-energy alternative fuel blend with boron, oxygen, and short carbon chains. This study focuses on the preparation of EtOH, MeOH, and TMB fuels and homogenized fuel mixtures with high energy values and the characterization of their combustion behavior. The experiments were carried out by suspending ethanol-trimethy borate (EtOHTMB) and methanol-trimethyl borate (MeOH-TMB) fuel droplets on SiC wire and igniting them with an electrode producing an arc of 1 ms duration at 20 ms intervals with 6 kV energy. The results showed that EtOH and TMB formed a homogenized fuel mixture at all mixing ratios and the largest and most homogeneous green luminescence flame envelopes (depending on boron oxidation) were formed, indicating BO2 formation in almost all fuel mixtures. On the other hand, the droplets of MeOH-TMB fuel mixtures containing 20 wt%, 40 wt%, and 60 wt% MeOH exhibited the most favorable trend to the D2-law of diameter reduction during combustion. EtOHTMB fuel droplets containing 60 wt% TMB exhibited the highest maximum flame temperature of 631 K. In this study, it has been shown that new-generation hybrid transportation fuels with no phase separation, low ignition delay times despite increased oxygen content, and high calorific value can be produced with hybrid fuel blends to be formed with TMB and alcohols. The results obtained will shed light on the literature for the solution to the problematic combustion characteristics of boron, which is tried to be used in many areas of the transportation industry.
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    Combustion characteristics of gasoline fuel droplets containing boron-based particles
    (Elsevier Science Inc, 2023) Kucukosman, Ridvan; Degirmenci, Huseyin; Yontar, Ahmet Alper; Ocakoglu, Kasim
    Boron-based particles are dense energy carriers that are promising for a future carbon-neutral world, to store and transport abundant energy. Although it is prominent as a slurry fuel component in liquid aviation fuels, its effects on the combustion behavior of traditional hydrocarbon fuels used in public or industrial areas have not yet been clarified. In this study, combustion characteristics of gasoline-based fuel droplets containing 86-88%, and 95-97% < 1 mu m amorphous boron, 10 mu m AlB12, 28 - 35 mu m MgB2 particles and 1% oleic acid surfactant. The experimental process was recorded via a high-speed camera and a thermal camera. The results showed that the ignition delay time was reduced in all gasoline-based fuels containing boron-based particles. The fuels with the lowest extinction time were gasoline-based fuel droplets containing AlB 12 particles (similar to 1245 ms). Amorphous boron particles were transported to the flame region more than other particles and caused severe atomization phenomena. The highest maximum flame temperature for gasoline droplets at 2.5% particle load was recorded in high-purity amorphous boron particles with 537 K. At 7.5% particle load, the highest flame temperature and agglomerate temperature were observed at 513 K and 653 K, respectively, in gasoline droplets containing high-purity amorphous boron particles. In electric field tests, the shortest extinction time was detected for gasoline droplets with MgB12. Also, the addition of amorph boron particles into gasoline increase of 4.6% was seen in the flame speed. Droplet diameter regression plots show that particulate gasoline-based fuel droplets exhibit a decreasing trend, mostly following the D-2-law. It has been revealed low-cost amorphous boron derivatives can be an important energy carrier for liquid hydrocarbon fuels. (c) 2023 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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    Experimental Analysis of Flame Dynamics and Combustion Parameters of Fe-Enhanced Diesel Fuel Droplets Under Variable Ionic Effect Intensities
    (Taylor & Francis Inc, 2025) Degirmenci, Huseyin; Kucukosman, Ridvan; Alper Yontar, Ahmet
    This study examines the combustion behavior and parameters of hybrid fuels prepared by adding 2.5 wt.% Fe nanoparticles to diesel fuel under electric field strengths of E = 0 V/m, 5 V/m, 6.7 V/m, and 10 V/m. The motivation for this research stems from the urgent need to improve combustion efficiency and reduce emissions in heat engines that rely on diesel fuel. In this context, addressing these challenges through the development of novel system approaches is crucial. Additionally, comprehensive investigation of non-traditional fuels plays a vital role in advancing sustainable energy solutions. With global energy demands increasing and environmental concerns intensifying, the need for more efficient combustion processes has become critical. This study explores how fuel additives and electric field applications can contribute to achieving these goals in an environmentally friendly manner. Focusing on the ionic effect on flame dynamics, key combustion parameters were assessed, including flame shape ratio (FShR), average burn rate constant (BRCA), average burning rate (BRA), average flame propagation speed (FPSA), flame spread rate (FSpR), combustion duration (tcomb), and Damk & ouml;hler number (Da). The results indicate that the strength and direction of the ionic effect significantly affect combustion behavior. Notably, Diesel/200(up arrow) exhibited the highest BRCA, whereas Diesel/100(up arrow) achieved the lowest extinction time; however, it did not reach the expected BRCA due to a lower FShR. In the Diesel + Fe group, Diesel + Fe/100(up arrow) achieved the maximum BRCA. This was due to increased flame dispersion and the influence of a strong ionic effect. Additionally, Diesel/100(up arrow) exhibited the highest, which was consistent with the ionic effect direction. Adding Fe nanoparticles improved combustion dynamics by increasing burn rates and flame propagation speeds, which optimizes energy conversion processes. Reverse ionic effect enhanced combustion processes, positively impacting fuel diffusion. Findings showed that Diesel/100(down arrow), influenced by negatively charged ions, displayed a notable reduction in BRA. This highlights the importance of understanding the complex interaction between ionic effect and combustion behavior, particularly under varying electric field conditions. The addition of 2.5% Fe nanoparticles substantially increased BRA in the diesel+Fe group, with Diesel+Fe/100(up arrow) recording the highest BRA. Furthermore, the addition of Fe particles led to an increase in FPSA, allowing Diesel+Fe to achieve the fastest flame spread rate (FSpR) under strong wind conditions. While Diesel/100(up arrow) showed the lowest Da value, Diesel+Fe/100(up arrow) reached the highest, indicating the pronounced effect of reverse polarity on Da.