间距对热薄型PMMA滴落行为的影响研究  

Study on the influence of distance on the dripping behavior of thermally thin PMMA

作　　者：朱辉[1] 朱国庆[1] 陈清泉[1] 高云骥[1] ZHU Hui ZHU Guo-qing CHEN Qing-quan GAO Yun-ji(Faculty of Safety Engineering, China University of Min ing and Technology, Jiangsu Xuzhou 221116, China)

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《消防科学与技术》2016年第10期1355-1358,共4页Fire Science and Technology

基　　金：江苏省自然科学基金项目(BK20131117)

摘　　要：实验研究平行于墙体的热薄型PMMA板的滴落行为,并进行理论分析。使用红外热成像仪记录滴落现象,使用电子秤记录样板质量。结果表明,随着材料与墙体的间距增大,滴落时间、滴落质量和滴落前后燃尽增长距离的数值均是先减小后增大,正面和背面的火焰高度差值逐渐减小,直至背面火焰高度超过正面,距离超过25 mm时间距的影响可以忽略。假设滴落行为与材料的表面净热通量、拉伸黏度以及熔化的PMMA所受到的重力有关。The dripping behavior of thermally thin PMMA parallel to the wall was experimentally analyzed,and theoretically analyzed.The dripping behavior was recorded by infrared thermal imaging instrument,and the mass was recorded by electronic scale.Results showed that,with the distance between the material and wall increases,the time of dripping,mass of dripping,burnt length difference of before and after dripping all firstly decrease,then increase;the flame height difference of front and back reduces,and the back flame height exceeded the front eventually;the influence of distance over 25 mm can be ignored.It was assumed that the dripping behavior is related to the surface net heat flux,extensional viscosity,and the weight of melt PMMA.

关 键 词：薄型PMMA板 滴落行为 热通量 热解区域 

分 类 号：X924.4[环境科学与工程—安全科学] TK123[动力工程及工程热物理—工程热物理]