- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | SHI Xueqiang, ZHANG Yutao, CHEN Xiaokun, ZHANG Yuanbo, LIN Guocheng. Pool Flame Instability Characteristics under Transverse Acoustic Wave Disturbance[J]. Journal of Southwest Jiaotong University, 2022, 57(6): 1293-1302. doi: 10.3969/j.issn.0258-2724.20210152
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Ethanol pool flame experiments disturbed with transverse low-frequency acoustic wave were carried out to understand the mechanism of acoustic fire suppression and flame dynamics under acoustic disturbance. The acoustic frequency range was 28–54 Hz, and the local acoustic pressure range at the flame was 0.10–1.25 Pa. The basic acoustic parameters, phenomenological characteristics of flame, flame height and width, and flame periodic pulsation were explored with the changing acoustic duct length and distance between acoustic duct and flame. The relation model of flame width and flame height coupled with acoustic parameters was established. The results show that, compared with free flame, the lower acoustic pressure disturbance makes the flame shape and time series more stable, and the larger acoustic pressure disturbance makes the flame more unstable. With increasing Reynolds number locally, the relative flame height is suppressed by acoustic wave and declined, and the flame width changes from being compressed to being lengthened. In addition, lower acoustic pressure will modulate flame to stable periodicity and regular phase. Higher acoustic pressure will disturb flame periodicity, resulting in flame pulsation disorder and phase chaos.
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