Particle dynamics through turbulent premixed flames using 10 kHz TPIV, OH PLIF, and CH2O PLIF

Abstract eng:
This work experimentally quantifies the relationship between local reaction rate and flame thickness for turbulent premixed flames in the corrugated flamelet and thickened preheat zone/thin reaction zone regimes using data from simultaneous 10 kHz tomographic particle image velocimetry (TPIV), hydroxyl planar laser induced fluorescence (OH PLIF), and formaldehyde (CH2 O) PLIF. Two novel reaction rate metrics are presented, which are based on tracking fluid elements in a Lagrangian manner as they traverse from the flame leading edge to the reaction zone. Results indicate that in the thickened preheat zone regime there is a reduction in residence time by nearly 20%, despite the flame being broader. A positive linear correlation is observed between a flame speed metric and flame thickness, which is attributed to their mutual relationship with turbulent diffusivity.

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