Journal article
Experimental study on the excitation of thermoacoustic instability of hydrogen-methane/air premixed flames under atmospheric and elevated pressure conditions
International journal of hydrogen energy, Vol.44(39), pp.21324-21335
08/13/2019
DOI: 10.1016/j.ijhydene.2019.06.142
Abstract
The current work examines the excitation of thermoacoustic instability of lean premixed hydrogen-methane/air low swirl flames under both atmospheric and elevated pressure conditions (up to 0.3 MPa). Under a given pressure condition, The tests were conducted at different bulk velocities (U), hydrogen proportions (ηH), and equivalence ratios (Ф). Results show that thermoacoustic instability can be excited by increasing one of these variables while keeping others the same. It was found that pressure elevation has a minor effect on the oscillation frequency. Moreover, it was demonstrated that the current instability is induced by large coherent structures. The effect of pressure elevation on the excitation of thermoacoustic instability is found to be Φ dependent. As indicators of the flame response to impinging vortices, the curvature and local flame surface area features were calculated with images captured with the planar laser-induced fluorescence of the OH radical (OH-PLIF) method. Results demonstrate a great similarity between the flame front evolution and the instability trend, implying that the effect of the chamber pressure on the instability trend can be indicated by the change in the flame front curvature and local flame surface area.
•Studied the effect of hydrogen enrichment on thermoacoustic instability trend.•Studied the effect of pressure elevation on thermoacoustic instability trend.•Pressure elevation has a minor effect on the oscillation frequency.•Used laser diagnostics to study the flame front curvature and local flame area.•The instability trend can be indicated by the change in flame front properties.
Details
- Title: Subtitle
- Experimental study on the excitation of thermoacoustic instability of hydrogen-methane/air premixed flames under atmospheric and elevated pressure conditions
- Creators
- Jianan Zhang - University of IowaAlbert Ratner - University of Iowa
- Resource Type
- Journal article
- Publication Details
- International journal of hydrogen energy, Vol.44(39), pp.21324-21335
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.ijhydene.2019.06.142
- ISSN
- 0360-3199
- eISSN
- 1879-3487
- Grant note
- DOI: 10.13039/100008893, name: University of Iowa
- Language
- English
- Date published
- 08/13/2019
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984196544502771
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