矩形喷口射流火火焰轴向温度研究  

Axial temperature distribution of vertical jet flames from rectangular nozzles

作　　者：沈燕[1] 陶常法[2] 宗若雯[1,3] 支有冉[4] SHEN Yan TAO Changfa ZONG Ruowen ZHI Youran(State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China School of Automotive and Traffic Engineering, Hefei University of Technology, Hefei 230009, China Suzhou Key Laboratory of Urban Public Safety, Suzhou Institute for Advanced Study, University of Science and Technology of China, Suzhou 215123, China Institute of Mechanical Engineering, Nanjing Institute of Technology Nanjing, Nanjing 211167, China)

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230026 [2]合肥工业大学动力机械及工程系,合肥230009 [3]中国科学技术大学苏州城市公共安全重点实验室,苏州215123 [4]南京工程学院机械工程学院,南京211167

出　　处：《火灾科学》2017年第2期87-92,共6页Fire Safety Science

基　　金：国家自然科学基金面上项目(51576185;51606092);国家重点研发计划(2016YFC0802101);中央高校基本科研业务费专项资金(WK2320000034)

摘　　要：随着我国能源结构低碳化的发展,天然气产业在我国得到进一步升级。在利用高压管道进行输运的过程中,因泄漏而引发的天然气火灾爆炸事故时有发生。实验以甲烷为燃料,研究不同开口特征下(长宽比n=1,2.25,4,9,16)矩形火源火焰中心轴线的温度分布。研究表明,火焰温度随热电偶相对位置的变化呈现出三段分布的规律。通过引入虚点源Z_0对经典羽流模型进行修正,发现不同长宽比下无量纲虚点源与火焰佛罗德数Fr_f呈现一定的函数关系,且无量纲温度在高度方向上仍呈现三段式分布。Extensive use of natural gas requires high pressure pipelines. During the transportation of natural gas,it is easy to be fired and blasted caused by the leakage. In this paper,the axial temperature distribution of vertical methane jet flames from rectangular nozzles has been studied. The aspect ratio of the rectangular nozzles ranges from 1 to 16. The result shows that the axial temperature can be characterized into three regions based on axial position in the flame. The virtual origin has been deduced and it is a function of flame Froude number（ Fr_f）. It is also found that the axial temperature against dimensionless height（ modified by virtual origin） can be divided into three zones.

关 键 词：矩形喷口 射流火 轴向温度 虚点源 

分 类 号：X932[环境科学与工程—安全科学]