Tulip火焰形成过程中的细微结构特性  

Characteristics of Fine Structure During Tulip Flame Forming

作　　者：陈先锋[1] 孙金华[1] 姚礼殷[1] 刘洋[2] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室 [2]武汉电力职业技术学院电力工程系,武汉430079

出　　处：《燃烧科学与技术》2008年第4期350-354,共5页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50576093);火灾科学国家重点实验室开放课题资助项目(HZ2007-KF06)

摘　　要：为揭示预混火焰传播的动力学过程以及Tulip火焰的形成规律,采用高速纹影摄像系统并结合离子电流探测等技术手段,对管道内丙烷-空气预混火焰传播过程中的细微结构进行了实验研究.结果表明,在Tulip火焰形成过程中,伴随着层流火焰向湍流转变以及火焰结构的变化;层流火焰中的小尺寸涡流增大火焰厚度,而随后大尺寸涡流使火焰发生褶皱与分层;Tulip火焰结构的形成是流动与火焰共同作用的结果,它标志着层流向湍流转变的充分发展.To explore the micro-dynamic behavior of premixed flame propagation and the Tulip flame structure, the premixed propane-alr flame was experimentally studied in a semi-vented pipe. The high-speed schlieren image system and ion current detection technology were used to explore the fine structure and propagation characteristics. The experimental result shows that, during the charge of flame front structure from convex to concave, small scale turbulence begins to appear and plays an important role on flame front, which increases flame front thickness and causes flame structure to change. While large-scale turbulence induces flame distortion and stratification. When Tulip flame structure comes into being, the transition from laminar to turbulent occurs, in conclusion, the flow-flame interaction results in flame structure change. The appearance Tulip flame structure forming indicates the accomlishment of laminar-turbulent transition.

关 键 词：预混火焰 火焰结构 Tulip火焰 层流向湍流转变 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]