Journal
PROCEEDINGS OF ASME 2021 INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION (IMECE2021), VOL 1
Volume -, Issue -, Pages -Publisher
AMER SOC MECHANICAL ENGINEERS
Keywords
Combustion oscillation; Acoustic impedance; Combustor model; Oscillation frequency; Temperature distribution; Hydrogen; Transfer matrix
Funding
- JSPS KAKENHI [19K14919]
- Ono Charitable Trust for Acoustics
- Paloma Environmental Technology Development Foundation Research Grant
- KEIRIN RACE
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Experimental and modeling analysis successfully predicted the combustion oscillation frequency under the 100% natural gas condition, but failed to accurately predict the frequency under the hydrogen-natural gas condition.
A combustion oscillation experiment showed combustion oscillation frequencies of around 350 Hz when only natural gas was used as fuel and approximately 200 and 400 Hz when a hydrogen-natural gas mixture was used. To analyze the resonant frequency, two- and four-region models considering unburned and burned regions of the combustor were developed. The experimental frequencies of the 100% natural gas condition were successfully predicted. Conversely, the experimentally observed frequencies under the hydrogen-natural gas condition were not accurately predicted. A swirler-combustor model was then constructed to get closer to the actual configuration and shape of the experimental setup. However, the model could not reproduce the experimental value under the hydrogen-natural gas condition. A whole piping model was then developed by adding a casing and an air supply pipe to the combustor. The resonant frequencies under both the 100% natural gas and hydrogen-natural gas conditions were successfully calculated. The model reproduced the range and change tendency of the experimentally measured oscillation frequency.
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