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从烟气流动控制微分方程出发,利用量纲分析导出建立地铁实验系统的相似准则数,给出建立模型实验的相似律,据此建立几何比例为1∶8的地铁区间与车站多功能模型实验平台。该平台分为地铁区间和地铁车站两个部分,具备全面研究地铁火灾科学问题和火灾工程问题的功能:定量火灾场景,火灾实时监测与预警,烟气流动规律,温度分布特性,通风排烟模式。在该实验台上进行一系列实验,结果表明:缩尺模型实验所获得的数据真实可信,能较好地反映火灾烟气运动规律。本实验台的建立对于地下空间火灾科学理论研究及火灾工程应用研究具有重要意义。
Based on the flue gas flow control differential equation, the similarity criterion for establishing subway experiment system was deduced by dimensional analysis, and the similarity law for establishing model experiment was derived. Based on this, a multi-function model experiment of subway section and station with geometric ratio of 1: 8 platform. The platform is divided into two parts: metro section and metro station. It has the functions of comprehensively studying scientific issues and fire engineering problems of subway fire: quantitative fire scene, real-time fire monitoring and early warning, flue gas flow law, temperature distribution characteristic, ventilation and smoke exhaust mode . A series of experiments were carried out on the experimental bench. The results show that the data obtained from the scale model experiments are credible and can well reflect the law of the motion of fire smoke. The establishment of this experimental platform is of great significance to the scientific research of fire in underground space and the application of fire engineering.