Mr. Hao Yan Profile

Hao Yan

at Institute of Mechanics

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Proceedings Article | 29 March 2019 Paper

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

Hao Yan, Shaohua Zhang, Xilong Yu

Proceedings Volume 11046, 110460Q (2019) https://doi.org/10.1117/12.2524456

KEYWORDS: Laser induced fluorescence, Luminescence, Combustion, Visualization, Fluid dynamics

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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).

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