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为了研究封闭空间对竖向电缆燃烧过程的影响,在开放空间和封闭空间内分别进行了一系列不同间隙的竖向电缆燃烧试验。通过分析开放空间和封闭空间内不同电缆间隙的竖向电缆燃烧过程中质量损失速率,得到电缆之间的间隙对竖向电缆燃烧速率有着决定性的影响。通过对比开放空间和封闭空间内竖向电缆的燃烧过程发现,封闭空间对竖向电缆燃烧过程的影响作用存在一个临界区间,该区间的临界判据是由电缆燃烧火焰对电缆的热作用和封闭空间内烟气层对电缆的热反馈决定的。基于封闭空间内的竖向温度分布,通过分析其无量纲温度梯度,得到封闭空间内竖向电缆燃烧过程存在一个特征明显的温度过渡区域。
In order to study the influence of enclosed space on vertical cable combustion process, a series of vertical cable burning tests with different gaps were carried out in open space and closed space respectively. By analyzing the rate of mass loss during vertical cable combustion in open space and in different enclosed spaces, it is found that the gap between the cables has a decisive influence on the vertical cable burning rate. By comparing the burning process of vertical cables in open space and closed space, it is found that there is a critical interval in the influence of closed space on the combustion process of vertical cables. The critical criterion in this interval is the thermal effect and closedness of the cable combustion flame on the cable Flue gas layer in the space of the cable thermal feedback decision. Based on the vertical temperature distribution in the enclosed space, a dimensionless temperature gradient is obtained, which shows that there is a distinct temperature transition region in the vertical cable combustion in the enclosed space.