年間 12 号発行
ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684
Indexed in
A THEORY ON EXCESS-ENTHALPY SPRAY FLAME
要約
A steady, one-dimensional, low-speed flame propagating in a dilute, monodisperse, sufficiently off-stoichiometric and weakly heterogeneous spray with external heat recirculation, is analyzed using activation energy asymptotics. A prevaporized mode and a partially prevaporized mode of flame propagation are identified. Heat recirculation is achieved by transferring heat through a tube wall within a given distance L. The external heat transfer results in globally external heat loss and excess enthalpy burning (which is globally adiabatic), respectively, to the spray system with increasing wall temperature. The influences of external heat recirculation and liquid fuel spray on the flammability limit and extinction of spray flames are examined with three parameters, namely, the amount of external heat transfer, the liquid fuel loading, and the initial droplet size. It is found that the extent of flammability is enlarged with increasing liquid loading or decreasing droplet size for lean sprays, while the opposite holds for rich sprays; and that the change of an extinction curve to a curve characterized by blow-off and flashback is controlled by the balance between internal and external heat transfer.
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Hou Shuhn-Shyurng, Lin Jiann-Chang, Hsuan Chung-Yao, The interaction between internal heat gain and heat loss on compound-drop spray flames, International Journal of Heat and Mass Transfer, 71, 2014. Crossref
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HOU Shuhn-Shyurng, The Quenching of Spray Flames by Stretch and Heat Loss., JSME International Journal Series B, 46, 2, 2003. Crossref
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Hou Shuhn-Shyurng, Lin Jiann-Chang, The influence of preferential diffusion and stretch on the burning intensity of a curved flame front with fuel spray, International Journal of Heat and Mass Transfer, 46, 26, 2003. Crossref
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Lin Jiann-Chang, Hsuan Chung-Yao, Hou Shuhn-Shyurng, Theory of non-adiabatic conical spray premixed flames with non-unity Lewis number, International Journal of Heat and Mass Transfer, 91, 2015. Crossref
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Tsai Chih-Hsin, Hou Shuhn-Shyurng, Lin Ta-Hui, Spray flames in a one-dimensional duct of varying cross-sectional area, International Journal of Heat and Mass Transfer, 48, 11, 2005. Crossref
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Hou Shuhn-Shyurng, Analysis of a stagnation-point premixed flame influenced by inert spray, heat loss, and non-unity Lewis number, Applied Mathematical Modelling, 37, 3, 2013. Crossref
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Hou Shuhn-Shyurng, The interaction between internal heat loss and external heat loss on the extinction of stretched spray flames with nonunity Lewis number, International Journal of Heat and Mass Transfer, 46, 2, 2003. Crossref
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Tsai Chih-Hsin, Hou Shuhn-Shyurng, Lin Ta-Hui, A spray flame propagating in a nonadiabatic duct with varying cross-sectional area, Combustion and Flame, 144, 1-2, 2006. Crossref
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Lin Jiann-Chang, Hou Shuhn-Shyurng, Lin Ta-Hui, A theoretical study on Bunsen spray flames, International Journal of Heat and Mass Transfer, 46, 6, 2003. Crossref
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Hou Shuhn-Shyurng, Lin Ta-Hui, Effects of internal heat transfer and preferential diffusion on stretched spray flames, International Journal of Heat and Mass Transfer, 44, 23, 2001. Crossref
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Hsuan Chung-Yao, Lin Ta-Hui, Parametric study on a compound-drop spray flame, Combustion Theory and Modelling, 16, 3, 2012. Crossref