Measurement of local flame speeds in the thickened flamelet regime using simultaneous 10 kHz TPIV and OH/CH2O PLIF

Abstract

Simultaneous 10 kHz repetition-rate tomographic particle image velocimetry (TPIV), hydroxyl planar laser induced fluorescence (OH PLIF), and formaldehyde (CH2O) PLIF were performed in a turbulent premixed flame in the thickened flamelet regime in order to quantify the conditional local turbulent flame speed. The flame speed is computed based on the rate at which fluid control masses pass through a 3D flame contour, determined from the TPIV Mie scattering. Calculated flame speeds are shown to exceed the laminar flame speed. Conditional statistics on flame speed and local, instantaneous turbulence are presented, showing no direct correlation.