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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/2584

    Title: Influence of water sprays and heat loss on negatively and positively stretched curved premixed flames
    Authors: Jiann-Chang Lin
    Shuhn-Shyurng Hou
    Keywords: Bunsen Flame
    Inverted Bunsen Flame
    Lewis Number
    Heat Loss
    Date: 2006
    Issue Date: 2009-08-12 19:33:40 (UTC+8)
    Abstract: In the present study, the structure of normal (or inverted) Bunsen flame tips under the influence of a monodisperse dilute water spray and external heat loss is investigated using large activation energy asymptotics. We consider two flame structures: normal and inverted Bunsen flames, and two spray modes: completely and partially prevaporized burnings. In this way, a complete parametric study of flame tip intensification or extinction (opening) can be conducted. Five parameters are used in the analysis. Three are the droplet size, amount of liquid-water loading, which indicate internal heat loss for inert spray, and the external heat loss. The other two are the stretch and Lewis number ( ). Stretch is negative for a normal Bunsen flame but positive for an inverted Bunsen flame. Stretch strengthens (or weakens) the burning intensity of the (or ) normal Bunsen flame but decreases (or increases) the burning intensity of the (or ) inverted Bunsen flame. Burning intensity of the flame tip weakens when the water spray has a smaller droplet size or a larger amount of liquid loading, or when the curved flame experiences a larger amount external heat loss. For a rich methane-air normal Bunsen flame with or a lean methane-air inverted Bunsen flame with , closed tip solutions are obtained. Conversely, stretch weakens the burning intensity of a rich methane-air inverted Bunsen flame with , or a lean methane-air normal Bunsen flame with , eventually leading to tip opening. Moreover, the opening becomes wider when the droplet size decreases, liquid loading increases, or external heat loss enlarges.
    Relation: Atomization & Sprays, v.16, iss. 17, 2006
    Appears in Collections:[機械工程系所] 期刊論文

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