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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer from a turbulent swirling inverse diffusion flame to a flat surface
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Heat transfer from a turbulent swirling inverse diffusion flame to a flat surface

机译：热量从湍流旋流逆扩散火焰传递到平坦表面

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摘要

The heat transfer characteristics of a turbulent and swirling inverse diffusion flame (IDF) impinging vertically normal to a flat surface were investigated experimentally. The heat flux was measured by a heat flux sensor, Vatell HFM-6D/H. The effects of Reynolds number, overall equivalence ratio, nozzle-to-surface distance H and swirl number on the heat flux distributions were examined. The comparison of heat transfer of impinging IDFs with and without swirl was also conducted.rnThe experimental results showed that the swirling effect influences the local heat flux in three ways. (1) The heat transfer at the stagnation point is severely suppressed. (2) The peak of local heat flux dwells at a radial distance from the stagnation point. (3) The radial position of peak local heat flux shifts farther away from the stagnation point with increasing H. There exists an optimum value of H at which the heat transfer to the target surface is the maximum and the optimum H increases with increasing Φ while the Reynolds number and the swirl number are unchanged.rnThe comparison of IDFs revealed that the swirling IDF has more complete combustion and thus it is accompanied by higher heat transfer rates at small H at which there exists a cool core in the case of the non-swirling IDF. The IDF, however, has worse heat transfer at higher H where the non-swirling IDF achieves complete combustion while the swirling IDF has been cooled by the entrained ambient air.rnUpon comparing the swirling and non-swirling IDFs at the same Re and Φ, their respective optimum H showed an unfavorable effect of swirl on the overall heat transfer rate which has a reduction of up to 25% in the swirling IDF compared with the non-swirling IDF.
机译：实验研究了垂直垂直于平坦表面的湍流和旋流逆扩散火焰（IDF）的传热特性。通过热通量传感器Vatell HFM-6D / H测量热通量。研究了雷诺数，总当量比，喷嘴与表面的距离H和旋流数对热通量分布的影响。实验结果表明，旋流效应以三种方式影响局部热通量。 （1）严重地抑制了停滞点处的热传递。 （2）局部热通量的峰值停留在离停滞点的径向距离处。 （3）局部局部热通量的径向位置随着H的增加而远离停滞点。存在一个最优的H值，在该H值下，向目标表面的热传递最大，并且随着Φ的增加，最优H值增加。 IDF的比较表明，IDF涡流具有更完全的燃烧，因此在小H时伴随着较高的传热速率，在非H情况下存在较冷的堆芯。旋转的IDF。但是，IDF在较高的H处传热较差，在这种情况下，非涡旋IDF完全燃烧，而涡旋IDF已被夹带的周围空气冷却。在比较相同Re和Φ的涡旋IDF和非涡旋IDF时，它们各自的最佳H值显示出涡旋对整体传热速率的不利影响，与非涡旋IDF相比，涡旋IDF最多降低了25％。

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