PVC电缆全尺寸燃烧试验与数值模拟研究  

Full-scale vertical combustion test of PVC cable and computational fluid dynamics study

作　　者：付强[1] 张和平[1] 杨华[1] 王学贵[1] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,合肥230027

出　　处：《安全与环境学报》2010年第3期157-161,共5页Journal of Safety and Environment

基　　金：中国科学技术大学火灾科学国家重点实验室自主研究课题

摘　　要：在利用锥形量热计测试方法获得电缆燃烧热、点燃温度等火灾数值模拟参数基础上,利用FDS数值模拟软件对电缆全尺寸试验平台电缆燃烧试验进行模拟。对比模拟结果与试验结果发现,热释放速率、温度等参数吻合较好。热释放速率到达峰值时间试验值为231s,模拟值为243 s;热释放速率峰值试验值为53 kW,模拟值为55 kW。研究表明,利用数值模拟对电缆燃烧过程进行精确模拟是可行的。The present paper is concerned about a comparative study of the burning behavior of PVC cable by using a full-scaled PVC cable platform and the numerical analogy method. In this paper we have gained such fire numerical analog parameters as the heat of cable combustion, ignition temperature and so on through a cone-shaped calorimeter test and found that the computational fluid dynamics has been playing a fairly important role in determining the fire hazard characteristics, which are featured with nice repetition and low cost. It is just on the basis of the fire numerical analog parameter that we are inchned to adopt the FDS computational fluid dynamics software for the simulated experiment of cable combustion on the full-scale PVC cable platform. Furthermore, we have also analyzed the temperature distribution in the said platform and the time-variation charac- teristics of heat-releasing rate of the sample. The comparison between the experimental test and contrasted simulated test shows that the two kinds of testing results are in perfect conformity with each other. For example, in the experimental test, the peak value for the heat-releasing rate is 231 s, whereas its contrasted value is 243 s in the analog test. In contrast, the heat-release rate reaches its 53 kW in the experimental test, but its counterpart is 55 kW in the analog test. Thus, it should be a big success that we have successfully simplified the cable model used in the numerical analogy. It has thus proved that the simplification is credible. The other finding we have gained is that the combustible substance quantity turns out to be just 0. 355 kg/m in the experimental test whereas it is 0. 390 kg/m in the analog test, with the total combustion heat being 143 MJ in the experimental test as against 157 MJ in the analog test. Therefore, conclusions can be made that the suggested full-scale PVC cable combustion test is feasible on the condition that the numerical analogy method is used to simulate the process of cable combustion. In addition, the alum

关 键 词：安全工程 电缆 数值模拟 热释放速率 温度 

分 类 号：X913.4[环境科学与工程—安全科学] TM246[一般工业技术—材料科学与工程]