Dynamics character of swirling flame investigated by OH and CH2O planar laser-induced fluorescence

Hao Yan; Shaohua Zhang; Xilong Yu

doi:10.1117/12.2524456

29 March 2019 Dynamics character of swirling flame investigated by OH and CH₂O planar laser-induced fluorescence

Hao Yan, Shaohua Zhang, Xilong Yu

Author Affiliations +

Proceedings Volume 11046, Fifth International Symposium on Laser Interaction with Matter; 110460Q (2019) https://doi.org/10.1117/12.2524456
Event: Fifth International Symposium on Laser Interaction with Matter, 2018, Changsha, China

Abstract

The model combustor of aircraft engine under fuel-lean condition is characterized by planar laser-induced fluorescence (PLIF) technique. By imaging the fluorescence from OH and CH₂O simultaneously under various operation points, the transient structures of the reaction zone and preheat zone have been investigated. By the application of proper orthogonal decomposition (POD) and extended POD (EPOD) methods to the OH PLIF and CH₂O PLIF data, the main dynamics modes of the swirling flame are extracted, as well as the CH₂O PLIF signal distribution for each POD mode. The experimental results indicate that as the thermal power of the combustor increases, the time-averaged structure and dynamics modes experience notable transitions. At relatively high flow rate, local extinction occurs and unburnt fuel emerges in the external recirculation zone (ERZ).

Citation Download Citation

Hao Yan, Shaohua Zhang, and Xilong Yu "Dynamics character of swirling flame investigated by OH and CH₂O planar laser-induced fluorescence", Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110460Q (29 March 2019); https://doi.org/10.1117/12.2524456

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