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首页> 外文期刊>International Journal of Heat and Mass Transfer >The interaction between internal heat gain and heat loss on compound-drop spray flames
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The interaction between internal heat gain and heat loss on compound-drop spray flames

机译：复合液滴喷雾火焰的内部热量获取和热量损失之间的相互作用

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摘要

The effects of the shell-fuel mass fraction, the compound drop radius, and the liquid loading on one-dimensional laminar premixed flames are theoretically studied using large-activation-energy asymptotics. A compound drop is composed of a water core encased by a shell of n-octane. A completely prevaporized mode is identified, in which no liquid droplets exist downstream of the flame. The shell-fuel mass fraction dominates the internal heat transfer and vaporization rate for an individual compound drop, which may induce a positive effect (overall heat gain) or a negative effect (overall heat loss) on the flame. The liquid loading represents the total quantity of the compound-drop spray. The combined effects of the shell-fuel mass fraction and the liquid loading on the premixed flame show that the flame intensity is enhanced (suppressed) by overall internal heat gain (heat loss), i.e., the flame speed increases (decreases) due to the overall internal heat gain (heat loss). As a result, the residence time required for the drops to achieve prevaporization and the temperature profile of the pre-heating zone are significantly influenced by the flame speed. The critical values of the initial drop radius and the shell-fuel mass fraction that correspond to the critical condition of the completely prevaporized mode are determined by liquid loading and the flame propagation mass flux. The correlations among these factors are investigated.
机译：理论上，使用大活化能渐近理论研究了壳燃料质量分数，复合液滴半径和液体载荷对一维层流预混火焰的影响。复合液滴由被正辛烷壳包裹的水核组成。识别出完全预蒸发的模式，其中在火焰的下游不存在液滴。壳燃料质量分数主导着单个化合物滴的内部传热和汽化速率，这可能对火焰产生积极影响（总体热量增加）或消极影响（总体热量损失）。液体负荷代表化合物滴喷雾的总量。壳燃料质量分数和液体负载对预混火焰的综合影响表明，火焰强度通过内部总热量（热量损失）而得到增强（抑制），即，火焰速度由于燃烧而增加（降低）。内部整体热量获取（热量损失）。结果，液滴实现预蒸发所需的停留时间和预热区的温度曲线受火焰速度的影响很大。初始滴落半径和壳燃料质量分数的临界值与完全预蒸发模式的临界条件相对应，由液体载荷和火焰传播质量通量确定。研究了这些因素之间的相关性。

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