Journal
ENERGY
Volume 233, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.121188
Keywords
Thermoacoustic oscillations; Slope confinement; Slope angle; Slope step height; Centrally-staged swirl burner
Categories
Funding
- National Natural Science Foundation of China [91641109]
- National Science and Technology Major Project [2017-III-0004-0028]
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The study demonstrates that slope confinements have a suppressive effect on thermoacoustic oscillations, but the performance is influenced by the height and angle of the slope steps. Additionally, a qualitative relationship between the oscillation amplitude and the characteristic scale of corner recirculation zone has been established.
Lean premixed centrally-staged combustion holds the potential of meeting low-emission requirements, but it is known to be susceptible to thermoacoustic instabilities. A passive control method, using slope confinements has been demonstrated previously to be efficacy in suppressing thermoacoustic instabilities. Recognizing that the detailed flow features and the role of slope confinement structures associated with these thermoacoustic instabilities have not been well understood, the present study aims at revealing the suppressive mechanisms and assessing the suppressive efficacy of different slope confinements by measuring flow fields and conducting experiments with varying geometric parameters, including slope step height and slope angle. It is found that the slope confinements investigated have a general suppressive effect on thermoacoustic oscillations, which can be attributed to the limited vortex shedding from the dump plane. The slope confinement with smaller slope step height and slope angle is shown to have better performance on combustion stability. However, oscillations still occur in slope confinements with relatively large slope angle and step height. A qualitative relationship between the oscillation amplitude and the characteristic scale of corner recirculation zone is then established from the flow separation aspects. The present work provides insights into practical confinement design for passive control. (c) 2021 Elsevier Ltd. All rights reserved.
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