Bio-fuel Droplet Combustion: Burning Rate Constants and Microexplosion Phenomena Measurements

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Bio-fuel Droplet Combustion: Burning Rate Constants and Microexplosion Phenomena Measurements

貝璽嚴 , Masters　　Advisor：施聖洋　　

英文

液滴燃燒；生質柴油；葵花油和柴油混合的生質燃料；燃燒率常數；微爆； Droplet Combustion ； Biodiesel ； Sunflower oil ； Blended Bio-fuel With Diesel ； Burning Rate Constants ； Microexplosion

Abstract │ Reference (42) │ Altmetrics

Abstract 〈TOP〉

This thesis investigates experimentally bio-fuel droplet combustion in a quiescent atmosphere using two different kinds of bio-fuels, namely biodiesel and sunflower oil, together with their blends with diesel oil over a wide range of blended volumetric percentages varying from 5% to 75% for each of the two bio-fuels. Symmetrically spherical droplets with small diameters ranging from 0.45 mm to 0.60 mm are generated by a home-built piezoelectrically-driven droplet generator, where the small upwardly-injected droplet is suspended at the intersection of two very fine horizontally-positioned, perpendicularly-aligned ceramic fibers of 20 μm in diameter. A pair of Khantal wires of diameter 0.2 mm having a half-oval shape is horizontally placed on both sides of the suspended droplet for ignition. As soon as the ignition of flame that envelopes the droplet occurs, the two heating wires are electrically removed at which the initial droplet diameter (d0) is determined by a high-speed camcorder. These sequentially recording images are analyzed to obtain the burning droplet diameter (d) as a function of time (t) that is used to determinate the droplet burning rate constant (K) based on the best fitting slope of (d/d0)2 versus t data (the well-known d2-law). Results show that values of K increase with decreasing values of d0 for any fuels studied here. Pure biodiesel has a higher burning rate constant than that of diesel. The latter is free from microexplosion, while the former has weak microexplosion that occurs only at the very late burning stage just before the completion of droplet combustion. This may be due to a small quantity of methyl linoleic acid (4.92 wt. %) existed in biodiesel. Furthermore, complicated but very interesting microexplosion phenomena are observed for pure sunflower oil and its blends with diesel oil, in which two different values of K are found during the process of droplet combustion. When more than 50% of sunflower oil is within the blended fuel, the blended droplet undergoes a transition from regular burning in the first period (K1) to strong swelling, puffing, and microexplosion during the later stage of droplet combustion (K2), where K1 < K2. But such transition reverses when less sunflower oil (< 50%) is presented in the blended fuel. In other words, strong microexplosion occurs almost immediately in the beginning of droplet combustion, where K1 > K2. This reversing process of microexplosion may be attributed to different fatty acids with different volatile components in sunflower oil. It is found that the diffusion process plays an important role on droplet combustion, because various (d/d0)2 vs. t data sets with different curve can be collapsed into one single curve when t is normalized by a diffusivity time scale, tdiff = d02/α, where α is the thermal diffusivity of the droplet fuel. These results should be useful for our understanding of bio-fuel combustion that is important to automobile and aviation industries using bio-fuels to substitute fossil liquid fuels in the future.

Parallel Abstract 〈TOP〉

Reference ( 42 ) 〈TOP〉

[1] Günnur, K., and Nilgün, C., "An overview of biofuels from energy crops: Current status and future prospects", Renewable and Sustainable Energy Reviews, Vol.28, pp. 900–916, 2013.
連結：
[2] Arent, D.J., Wise, A., and Gelman, R., "The status and prospects of renewable energy for combating global warming", Energy Economics, Vol.33, pp. 584-593, 2011.
連結：
[3] Rakopoulos, C.D., Antonopoulos, K.A., and Rakopoulos, D.C., "Experimental heat release analysis and emissions of a HSDI diesel engine fueled with ethanol–diesel fuel blends", Energy, Vol.32, pp. 1791–808, 2007.
連結：
[4] Agathou, M.S., and Kyritsis, D.C., "An experimental comparison of non-premixed biobutanol flames with the corresponding flames of ethanol and methane", Fuel, Vol.90, pp. 255–62, 2011.
連結：
[5] Rakopoulos, C.D., Antonopoulos, K.A., Rakopoulos, D.C., Hountalas, D.T., and Giakoumis, E.G.,"Comparative performance and emissions study of a direct injection diesel engine using blends of diesel fuel with vegetable oils or bio-diesels of various origins", Energy Convers Manage, Vol.47, pp.3272–3287, 2006.
連結：

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