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首页> 外文期刊>International Journal of Heat and Mass Transfer >The influence of preferential diffusion and stretch on the burning intensity of a curved flame front with fuel spray
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The influence of preferential diffusion and stretch on the burning intensity of a curved flame front with fuel spray

机译：优先扩散和拉伸对带有燃料喷雾的弯曲火焰前沿燃烧强度的影响

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In our most recent paper on Bunsen spray flames, only a completely prevaporized mode of a normal Bunsen flame was considered; inverted Bunsen flame and droplet size effects had not been examined yet. In the present study, we consider two flame structures: normal and inverted Bunsen flames, and two spray modes: completely and partially prevaporized burning, by the method of large activation energy asymptotics. In this way, a complete parametric study of flame tip intensification or extinction (opening) can be conducted. Four parameters are used in the analysis. The first two are the droplet size and amount of liquid-fuel loading, which indicate internal heat loss for a rich spray but heat gain for a lean spray. The other two are the stretch and Lewis number (Le). Stretch is negative for a normal Bunsen flame but positive for an inverted Bunsen flame. Stretch strengthens (or weakens) the burning intensity of the Le > 1 (or Le < 1) normal Bunsen flame but decreases (or increases) the burning intensity of the Le > 1 (or Le < 1) inverted Bunsen flame. Burning intensity of the flame tip intensifies (or weakens) when the lean (or rich) spray has a smaller droplet size or a larger amount of liquid loading. For lean and rich ethanol-spray normal Bunsen flames with Le > 1 or a rich methanol-spray inverted Bunsen flame with Le < 1, closed-tip solutions are obtained. Conversely, stretch weakens the burning intensities of lean and rich ethanol-spray inverted Bunsen flames with Le > 1, or rich methanol-spray normal Bunsen flames with Le < 1, eventually leading to tip opening. Moreover, the opening becomes wider (or narrower) as the droplet size decreases or liquid loading increases for the rich (or lean) sprays. Note that for lean ethanol-spray normal (or inverted) Bunsen flame with Le > 1, if liquid loading is large enough and droplet size is sufficiently small, there exists flame transition from normal (or inverted) Bunsen through planar to inverted cone (or normal Bunsen) flame. Finally, the critical value of droplet size, at which there exists a planar flame rather than a normal (or an inverted) Bunsen flame, increases with increasing liquid loading.
机译：在我们最新的本生喷雾中，只考虑了正常本生火焰的完全预蒸发模式。尚未检查倒置的本生火焰和液滴尺寸影响。在本研究中，我们考虑了两种火焰结构：正常和倒置本生火焰，以及两种喷雾模式：通过大活化能渐近方法进行完全和部分预蒸发燃烧。这样，可以对火焰尖端的增强或消光（开口）进行完整的参数研究。分析中使用了四个参数。前两个是液滴的大小和液体燃料的装载量，表示浓喷雾的内部热量损失，稀喷雾的热量增加。另外两个是stretch和路易斯数（Le）。对于正常的本生火焰，拉伸为负，但对于倒置的本生火焰，拉伸为正。拉伸会增强（或减弱）Le> 1（或Le <1）正常本生火焰的燃烧强度，但会降低（或增加）Le> 1（或Le <1）倒置本生火焰的燃烧强度。当稀薄（或浓稠）喷雾的液滴尺寸较小或液体负载量较大时，火焰尖端的燃烧强度会增强（或减弱）。对于Le> 1的稀薄和浓乙醇喷洒的普通本森火焰，或Le> 1的浓甲醇喷洒倒装本生火焰，可获得闭端溶液。相反，拉伸会削弱Le> 1的稀薄和浓乙醇喷雾倒立本生灯的燃烧强度，或者使Le <1的浓甲醇喷雾正常本生灯燃烧，最终导致尖端张开。而且，对于浓（或稀）喷雾，随着液滴尺寸减小或液体负荷增加，开口变宽（或更窄）。请注意，对于Le> 1的稀乙醇喷雾正常（或倒置）本生火焰，如果液体负载足够大且液滴大小足够小，则存在从正常（或倒置）本生通过平面圆锥到倒置圆锥体（或正常的本生灯）。最后，随着液体载荷的增加，存在平面火焰而不是正常（或倒置的）本生火焰的液滴尺寸的临界值会增加。

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