Numerical investigation on effects of mixing zone structure on flashback type for swirl-premixed hydrogen flame

被引：0
|
作者：
Tian, Xiao-Jing [1 ,2 ]
Cui, Yu-Feng [1 ]
Xing, Shuang-Xi [1 ]
Fang, Ai-Bing [1 ]
Nie, Chao-Qun [1 ]
机构：
[1] Key Laboratory of Advanced Energy and Power/Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing
[2] University of Chinese Academy of Sciences, Beijing
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2015年 / 36卷 / 03期
关键词：
Azimuthal vorticity; Boundary layer flashback; Combustion induced vortex breakdown (CIVB) flashback; Flashback type; Hydrogen flame;
D O I：
10.13675/j.cnki.tjjs.2015.03.004
中图分类号：
学科分类号：
摘要：
In order to use the correct flashback control methods, flashback type should be distinguished in advance. In the present investigation, the effects of mixing zone structure on flashback limit and flashback type were investigated with CFD simulation over a wide range of mixing length (L) and characteristic hydraulic diameter of mixing zone exit (D). Moreover, numerical experiments were arranged by Design of Experiments (DOE) method and results were dealt with analysis of variance. Based on the simulation results and the analysis, three conclusions can be drawn. Firstly, both L and D have prominent effects on flashback limit. Furthermore, either boundary flashback or combustion induced vortex breakdown (CIVB) flashback could be prevented by decreasing the residence time of mixture inside the mixing zone. Secondly, two critical dimensionless limits (L/D)cri are found to distinguish flashback type. If L/D≤(L/D)cri1, boundary layer flashback occurs. If L/D>(L/D)cri2, CIVB flashback occurs, otherwise maybe only CIVB flashback or both CIVB and boundary layer flashback occur. Finally, the critical azimuthal vorticity for CIVB flashback is changed by L/D. With the increase of L/D, critical azimuthal vorticity decreases which makes CIVB flashback more prone to be initiated. ©, 2015, Editorial Department of Journal of Propulsion Technology. All right reserved.
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页码：345 / 351
页数：6
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