Abstract
CH double-pulsed planar laser induced fluorescence (PLIF) measurements have been developed to investigate dynamics of flame elements in turbulent premixed flames. The CH-DPPLIF measurements, which are the direct measurements of displacement speed of the flame fronts, were conducted in relatively high Reynolds number turbulent premixed flames on a swirl-stabilized combustor. By selecting appropriate time interval of successive CH PLIF, movement of the flame front was captured clearly. In addition, by applying cross-correlation method for successive CH images obtained with minute time interval, displacement speed of the local flame element is measured, where the flame front is determined from mixed-average of CH fluorescence intensity in corresponding interrogation regions. Local flame displacement speed is of the order of u'_<rms> and probability density functions coincide very well for all Reynolds number cases under the normalization by u'_<rms>
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