Abstract Impinging jet fire of high exit momentum is frequently reported to induce the domino effect in industry fires. Less literature is available for the flame extension area and temperature distribution over a vertical plate impinged by the horizontal jet flame. Thus, this paper conducts a systematic experiment to reveal the effect of nozzle exit velocity, exit diameter and exit-plate spacing on the horizontally impinging jet fire. Experimental observation shows the evolution of flame pattern and color with an increase of exit velocity and a decrease of exit-plate spacing. The flame extension area induced by the horizontal jet flame impingement was measured by a novel method that combines the picture processing technique and the thermal imaging technique. By physical analysis, a new correlation coupling the turbulent Karlovitz stretch factor and the ratio of nozzle exit diameter to exit-plate spacing, was developed for the flame extension area of both horizontally and vertically impinging jet fire. The variation of maximum temperature in the impinging zone with the exit-plate spacing still fits the classic correlation of centerline temperature in the continuous and intermittent flames. However, the horizontally impinging jet fire plume holds a shorter intermittent flame region due to the flame upward bending. It is found that the temperature profile holds a big difference in the upward and downward directions along the vertical plate. A new uniform correlation, with the plume radius as the characteristic length scale, is proposed to well collapse all the temperature data in the impinging zone.

中文翻译：

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水平喷射火撞击垂直板的火焰扩展面积和温度分布

摘要 高出口动量的撞击喷射火经常被报道在工业火灾中引起多米诺骨牌效应。对于水平喷射火焰撞击的垂直板上的火焰扩展区域和温度分布，可用的文献较少。因此，本文进行了系统实验，以揭示喷嘴出口速度、出口直径和出口板间距对水平撞击射流火灾的影响。实验观察表明，火焰图案和颜色随着出口速度的增加和出口板间距的减小而演变。采用图像处理技术和热成像技术相结合的新方法测量了水平射流火焰冲击引起的火焰扩展面积。通过物理分析，为水平和垂直撞击射流火焰的火焰扩展区域开发了一种新的相关性，耦合了湍流卡洛维茨拉伸因子和喷嘴出口直径与出口板间距的比率。撞击区最高温度随出口板间距的变化仍然符合连续和间歇火焰中中心线温度的经典相关性。然而，由于火焰向上弯曲，水平撞击的喷射火羽流保持较短的间歇火焰区域。发现温度剖面沿垂直板向上和向下方向存在较大差异。提出了一种新的统一相关性，以羽流半径为特征长度尺度，以很好地折叠撞击区的所有温度数据。