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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer characteristics of an impinging inverse diffusion flame jet. Part II: Impinging flame structure and impingement heat transfer
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Heat transfer characteristics of an impinging inverse diffusion flame jet. Part II: Impinging flame structure and impingement heat transfer

机译：撞击逆扩散火焰射流的传热特性。第二部分：撞击火焰结构和撞击传热

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摘要

This paper is the second part of the experimental study on exploring the feasibility of inverse diffusion flame (IDF) for impingement heating. The structures and heat transfer characteristics of an impinging IDF jet have been studied. Four types of impinging flame structure have been identified and reported. The distributions of the wall static pressure are measured and presented. The influences of the global equivalence ratio (ø), the Reynolds number of the air jet (Re_(air)), and the non-dimensional burner-to-plate distance (H/d_(air)), on the flame structure, and the local and averaged heat transfer characteristics, are reported and discussed. The highest heat transfer occurs when the tip of the flame inner reaction zone impinges on the plate. The heat transfer rate from the impinging IDF is found to be higher than that in the premixed flame jet due to the augmented turbulence level originated from the flame neck. This high heat transfer rate, together with its in-born advantage of no danger of flashback and low level of nitrogen oxides emission, demonstrates the blue, dual-structured, triple-layered IDF is a desirable alternative for impingement heating.
机译：本文是探索反扩散火焰（IDF）撞击加热可行性的实验研究的第二部分。已经研究了撞击IDF射流的结构和传热特性。已经确定并报告了四种类型的撞击火焰结构。测量并给出了壁静压的分布。整体当量比（ø），空气射流的雷诺数（Re_（air））和无量纲燃烧器到平板的距离（H / d_（air））对火焰结构的影响，并讨论了局部和平均传热特性。当火焰内部反应区的尖端撞击在板上时，发生最高的热传递。由于来自火焰颈的湍流水平增加，发现来自撞击IDF的传热速率高于预混合火焰射流的传热速率。这种高的传热速率以及其固有的优势，即没有回火的危险和氮氧化物的低水平排放，证明了蓝色，双层，三层IDF是冲击加热的理想替代品。

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