Flame stabilization mechanisms and shape transitions in a 3D printed, hydrogen enriched, methane/air low-swirl burner

被引:43
作者
An, Qiang [1 ,3 ]
Kheirkhah, Sina [2 ]
Bergthorson, Jeffrey [3 ]
Yun, Sean [1 ]
Hwang, Jeongjae [4 ]
Lee, Won June [4 ]
Kim, Min Kuk [4 ]
Cho, Ju Hyeong [4 ]
Kim, Han Seok [4 ]
Vena, Patrizio [1 ]
机构
[1] Natl Res Council Canada, Aerosp Res Ctr, 1200 Montreal Rd, Ottawa, ON K1A 0R6, Canada
[2] Univ British Columbia, Sch Engn, Kelowna, BC V1V 1V7, Canada
[3] McGill Univ, Dept Mech Engn, Montreal, PQ H3A 0G4, Canada
[4] Korea Inst Machinery & Mat, Clean Combust Lab, Daejeon 34103, South Korea
关键词
Low-swirl combustion; Flame stabilization; Flame shape transition; Hydrogen enrichment; Laser diagnostics; Heat release rate; DIRECT NUMERICAL-SIMULATION; BOUNDARY-LAYER FLASHBACK; COMBUSTION; FORMALDEHYDE; INJECTOR;
D O I
10.1016/j.ijhydene.2021.01.112
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Flame shapes and their transitions of premixed hydrogen enriched methane flames in a 3D-printed low-swirl burner are studied using simultaneous OHxCH(2)O planar laser induced fluorescence and stereoscopic particle image velocimetry. Three different flame shapes are observed, namely bowl-shape, W-shape, and crown-shape. The bowl-shaped flame has its base stabilized through flame-flow velocity balance and its sides stabilized in the inner shear layer. While the bulges of the W-shaped flame rely on a similar stabilization mechanism in the central flow, its outer edges are stabilized by large-scale eddies in the outer shear layer. The crown-shaped flame is also aerodynamically stabilized in the center, but its outer edges are anchored to the burner hardware. At a fixed equivalence ratio, the statistical transitions between flame shapes across test conditions are jointly dominated by hydrogen fraction and bulk velocity. Dynamically, W-to-crown transition is attributed to the upstream propagation and attachment of the flame outer edges. Crown Copyright (C) 2021 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. All rights reserved.
引用
收藏
页码:14764 / 14779
页数:16
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