CIVB flashback analysis of hydrogen flame based on azimuthal vorticity at mixing zone exit  

作　　者：TIAN Xiao Jing XING Shuang Xi CUI Yu Feng FANG Ai Bing NIE Chao Qun 

机构地区：[1]Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出　　处：《Science China(Technological Sciences)》2014年第12期2466-2474,共9页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51306180 and 51406203)

摘　　要：Swirl-premixed combustion systems exhibit potential to meet future regulations on pollution emissions. However, combustion induced vortex breakdown(CIVB) flashback is frequently observed in these systems, especially for high hydrogen content fuel. In this study, a swirl-premixed burner with diverging centerbody was used to investigate CIVB flashback based on azimuthal vorticity at mixing zone exit. Through 2D axisymmetric model, it was found that there was a maximal azimuthal vorticity at mixing zone exit for each equivalence ratio. The physical meaning of these maximal azimuthal vorticity values was the minimally required azimuthal vorticity to trigger CIVB flashback. At the same time, the required azimuthal vorticity declined with the increase of equivalence ratio since turbulent burning velocity started to control flashback. Nevertheless, azimuthal vorticity offered by heat release increased with the increase of equivalence ratio, which promoted flame propagating upstream continually.

关 键 词：azimuthal vorticity mixing zone exit premixed hydrogen flame CIVB flashback 

分 类 号：TK16[动力工程及工程热物理—热能工程] X502[环境科学与工程—环境工程]