摘要
针对热塑性聚合物在锥形量热仪中燃烧测试时的熔融行为,提出了有限厚度的聚合物固体一维不稳态燃烧微分模型。模型中考虑了熔融层的存在,并且在熔融层中采用与基层不同的热物性参数,分析了熔融层导热系数及热容对聚合物燃烧过程的影响。研究表明,随着熔融层导热系数或热容的增大,聚合物的点燃时间延迟,燃烧过程中质量损失速率下降。当熔融层的导热系数和热容比基层的大时,模拟结果与测试结果能较好地吻合。
Based on the study of melting behavior of thermoplastic polymers tested in the cone calorimeter, a differential numerical model for one-dimensional unsteady burning of polymers was put forward. In this model, a melting layer was included and thermal properties for the melting layer were assumed to be different from those for the virgin layer. Effects of thermal conductivity and thermal capacity on combustion process of the polymers were analyzed and simulated. The simulation results were compared with the experimental results. It was found that the modeling results were fairly agreed with the experimental results, particularly as thermal conductivity and thermal capacity of the melting layer were greater than those of the virgin layer. When material thermal conductivity or thermal capacity increased, ignition time of the polymers delayed and their mass loss rates decreased.
出处
《青岛科技大学学报（自然科学版）》
CAS
2005年第4期312-316,共5页
Journal of Qingdao University of Science and Technology:Natural Science Edition
基金
国家重点基础研究发展规划973项目(2001CB409600)
关键词
熔融
聚合物
燃烧
模拟
锥形量热仪
melting
polymer
combustion
simulation
cone calorimeter
