多火源气体射流火动力学特性研究  

An experimental investigation on dynamic characteristics of multi-fire sources turbulent burning of gas jet flame

作　　者：刘芹 贾琦晖 何沛祥[1] 陶常法 LIU Qin;JIA Qihui;HE Peixiang;TAO Changfa(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China;School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]合肥工业大学汽车与交通工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2021年第8期1094-1099,共6页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金青年基金资助项目(51408181)。

摘　　要：文章采用试验与理论相结合的方法,研究了不同喷嘴直径、多火源喷嘴距离及热释放速率下的火焰高度和温度的演化规律;通过无量纲分析,在单火源火焰高度公式的基础上发展了多火源气体射流火的无量纲火焰高度和无量纲热释放速率之间的关系式;通过分析建立了空气卷吸系数、火焰高度和热释放速率之间的关系模型。研究结果表明:在喷嘴距离较小的情况下,火焰发生耦合,火焰高度明显增大;随着喷嘴距离增大,火焰的耦合行为逐渐减弱直至消失;在火焰底部,火焰温度较低,随着高度上升,火焰温度增大,当达到羽流区时,火焰温度随着高度增加而减小。In this paper,the evolution of flame height and temperature with different nozzle diameters,distances between nozzles and heat release rates is studied experimentally and theoretically.Based on the empirical formula of single fire source flame height,the relationship between dimensionless flame height and dimensionless heat release rate of multi jet flame was developed by dimensionless analysis.The correlation among air entrainment coefficient,flame height and heat release rate was established.The results show that when the nozzle distance is small,the flame coupling occurs and the flame height increases obviously,while with the increase of nozzle distance,the coupling behavior of flame gradually weakens and disappears.The temperature is low in the lower part of the flame and it increases with the increase in height.However,when it reaches the plume area,the flame temperature decreases with the increase in height.

关 键 词：射流扩散火焰 火焰高度 火焰温度 热释放速率 喷嘴距离 

分 类 号：X932[环境科学与工程—安全科学]