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基于自然通风条件下受限空间内的横向1、2、3和4层电缆燃烧试验,验证双区域模型模拟横向电缆火灾动力学过程的可靠性。首先,根据横向电缆火灾试验中测量的室内温度场的变化,证明横向电缆火灾过程基本符合双区域模型假设。然后,比较区域模型预测值与试验测量值,得到了区域模型预测的误差范围为0.004~0.169。研究表明,双区域模型能够可靠地模拟室内横向多层电缆火灾过程。此外,基于间隔0.15 m的4层电缆的燃烧,研究了区域模型火源设置(即设置1个火源和设置4个火源)对模拟结果的影响,结果表明,设置为1个火源得到的最大误差达31.1%,而设置为4个火源的模拟结果相对更加可靠,其误差不超过6%。因此,对横向多层电缆火灾过程的区域模型预测,建议将每层电缆设置为单个火源。
Based on the combustion tests of horizontal 1, 2, 3 and 4 cables in a confined space under natural ventilation, the reliability of a two-zone model simulating fire dynamics of transverse cables was verified. First of all, according to the change of indoor temperature field measured in the transverse cable fire test, it is proved that the transverse cable fire process basically accords with the double regional model assumption. Then, comparing the predictions of the regional model with the experimental measurements, the error range of the regional model prediction is 0.004 ~ 0.169. The research shows that the dual-zone model can simulate the indoor transverse multi-layer cable fire process reliably. In addition, based on the combustion of a 4-layer cable at a distance of 0.15 m, the effects of the regional model source setting (ie, setting 1 source and setting 4 sources) on the simulation results are studied. The results show that setting 1 source as The maximum error of 31.1%, while the simulation results set to 4 sources of fire is relatively more reliable, the error does not exceed 6%. Therefore, for the prediction of regional models of transverse multi-layer cable fires, it is advisable to set each layer of cable as a single source of ignition.