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- W2555243334 abstract "Turbulent swirl flames are known to exhibit intermittent transitions between V- and M-shapes at certain operating conditions. A diagnostic apparatus based on a commercial highspeed laser system is developed in this work to investigate the influence of such transient phenomenon on the surface temperature of an atmospheric-pressure gas turbine model combustor. The transition of flame shapes is monitored by planar OH laser-induced fluorescence (OH PLIF) at 1-kHz repetition rate. Simultaneously, the same laser beam is used to perform 1-D surface thermometry on the base plate and the bluff body of the combustor, which are coated with Mg4FGeO6:Mn, a commonly used thermographic phosphor (TP). Temperature is inferred from the decay of phosphorescence recorded by a highspeed CMOS camera operated at 70 kHz. During transitions between attached (V-) and lifted (M-) flames, pronounced temperature variation as much as 100 K is observed on the tip of the bluff body. In the spectral domain, temperature measured during the M-flame period exhibits a peak at 475 Hz, in good agreement with the measured frequency of the precessing vortex core (PVC) at the same operating condition. This peak does not appear during the V-flame period when PVC is suppressed. The uncertainty of the measurements and the sensitivity of the technique are discussed in detail." @default.
- W2555243334 created "2016-11-30" @default.
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- W2555243334 date "2017-04-01" @default.
- W2555243334 modified "2023-10-02" @default.
- W2555243334 title "Responses of combustor surface temperature to flame shape transitions in a turbulent bi-stable swirl flame" @default.
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- W2555243334 doi "https://doi.org/10.1016/j.expthermflusci.2016.11.004" @default.
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