半闭口狭窄通道内预混火焰传播过程的数值模拟  

Numerical Analysis of Premixed Flame Propagation in Semi-Closed Narrow Channel

作　　者：韩一钒 缪承希 Valiev Damir Han Yifan;Miao Chengxi;Valiev Damir(Center for Combustion Energy,Tsinghua University,Beijing 100084,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学燃烧能源中心,北京100084 [2]清华大学能源与动力工程系,北京100084 [3]清华大学热科学与动力工程教育部重点实验室,北京100084

出　　处：《燃烧科学与技术》2021年第6期599-603,共5页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(52176118);北京理工大学爆炸科学与技术国家重点实验室开放基金课题资助项目(KFJJ21-10M).

摘　　要：通过先前在Hele-Shaw平板装置实验中观测到的预混火焰振荡传播现象的激励,本文利用数值模拟方法研究了半闭口狭窄通道内低马赫数火焰的传播过程,观察到火焰的振荡和稳态传播模式.热膨胀率和通道宽度被作为影响火焰动力学特性的主要参数进行研究.结果表明气体热膨胀率和通道宽度会对火焰面形状和传播速度的稳定性产生影响.此外,狭槽内压力场沿长度方向的变化揭示了压力与火焰速度的耦合机制.Motivated by previous experimental observations of oscillatory premixed flame propagation between two parallel plates in Hele-Shaw cells,this work numerically studies the low Mach number flame propagation in a semi-closed narrow channel.Oscillatory and steady regimes of flame propagation are observed.Parametric studies are focused on the dependence of flame dynamics on both thermal expansion ratio and channel widths.Results indicate that both the thermal expansion ratio and channel width have an effect on the stability of curved flames and propagation speed.Variation of pressure field along the channel is also studied,revealing the coupling between pressure and flame velocity.

关 键 词：火焰振荡 热膨胀率 通道宽度 声压 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]