Flame stabilization mechanisms and shape transitions in a 3D printed,hydrogen enriched,methane/air low-swirl burner |
| |
Authors: | Qiang An Sina Kheirkhah Jeffrey Bergthorson Sean Yun Jeongjae Hwang Won June Lee Min Kuk Kim Ju Hyeong Cho Han Seok Kim Patrizio Vena |
| |
Affiliation: | 1. Aerospace Research Centre, National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, K1A 0R6, Canada;2. School of Engineering, University of British Columbia, Kelowna, British Columbia, V1V 1V7, Canada;3. Department of Mechanical Engineering, McGill University, Montréal, Québec, H3A 0G4, Canada;4. Clean Combustion Laboratory, Korea Institute of Machinery and Materials, Jang-dong, Yuseong-gu, Daejeon, 34103, Republic of Korea |
| |
Abstract: | Flame shapes and their transitions of premixed hydrogen enriched methane flames in a 3D-printed low-swirl burner are studied using simultaneous OH×CH2O 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. |
| |
Keywords: | Low-swirl combustion Flame stabilization Flame shape transition Hydrogen enrichment Laser diagnostics Heat release rate |
本文献已被 ScienceDirect 等数据库收录! |
|