Effect of highly hydrogen enrichment on the outer-shear-layer flame of confined lean premixed CH4/H2/air swirl flames (PDF)
Release Time:2025-04-30
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- Date:
- 2025-04-30
- Title of Paper:
- Effect of highly hydrogen enrichment on the outer-shear-layer flame of confined lean premixed CH4/H2/air swirl flames (PDF)
- Journal:
- Int J Hydrogen Energy
- Summary:
- Hydrogen induced transition of confined swirl flames from “V” to “M” shape is investigated. Hydrogen enriched lean premixed CH4/H2/air flames are conducted with hydrogen fractions up to 80%. The instantaneous and time averaged flame structure is obtained with Planar Laser Induced Fluorescence (PLIF) of the OH radical. Flow fields
are measured with Particle Image Velocimetry (PIV). Results show that with increasing hydrogen fractions, the flame tip in the outer shear layer gradually propagates upstream and finally anchors on the injector, which results in the transition from “V” to “M” flame. The flame structures and flame flow dynamics during the transition are examined.
The shape transition is directly related to the evolution of the corner flame along the outer shear layer. With hydrogen addition, the outer recirculation zone firstly appears downstream where the corner flame starts to propagate upstream; then, the recirculation zone expands upwards to gradually form a stable “M” flame. The flow straining is
expected to influence the stabilization of the outer shear layer flame a lot. This study helps to enrich the understanding of recirculation-stabilized swirling flames with strong confinement. The measurements on flame structure and flow characteristics of highly hydrogen contained flames are also valuable.
- Co-author:
- Mao ZE, Wang JH, Zhang WJ, An ZH, Lin WJ, Zhang M, Huang ZH
- Volume:
- 2021, 46(34): 17969-17981
- Page Number:
- 17969-17981
- Translation or Not:
- No
- Date of Publication:
- 2021-05-17