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The time evolution of the the velocity field and flame thermal boundary at the stabilization region of a lifted turbulent jet diffusion flame are observed using a high-speed Cinemagraphic Particle Image Velocimetry (CPIV) system. CPIV images are obtained at high acquisition rates (8000 images/s) and long sequence lengths (1100 images) compared to the characteristic time scales of the flow, showing relatively long histories of time incremental changes in the velocity field and the flame boundary. The velocity of the flame stabilization point and the gas velocity are determined simultaneously, providing a measurement of the flame propagation velocity. The measured average gas velocity (0.8 SL) and flame propagation velocity (0.2 SL) at the stabilization point are lower than the laminar flame speed SL. Intermittent flow reversal is observed in isolated regions immediately upstream of the stabilization point. The flow reversal is correlated with upstream flame motion, inward radial gas velocities, and eddy passage just inward of the stabilization point. The flow reversal may be induced by thermal expansion associated with the combustion process. This mechanism could play a significant role in turbulent jet flame stabilization because the induced velocities are similar to the measured flame propagation velocities.

Cinemagraphic PIV investigation of the lifted turbulent jet diffusion flame stabilization region