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An LDV system was employed to measure three components of velocity at a mid-flame point on the centerline of a propane-air flame of equivalence ratio 1.10 on a 26 mm-diameter Bunsen burner with fully developed turbulent pipe flow upstream at a Reynolds number of 6700. The LDV measurement volume was 1mm below the leading electrode of a four-element electrostatic probe that provided the velocity and direction of motion of flame-front in the turbulent flame brush. It was found that when the coordinate system was rotated about a vertical axis to the plane of the flame-front velocity vector, most of the burnt-gas motion following flame-front passage remained largely in this plane. The sequence of LDV data for gas motion in the burnt gas consistently showed movement beginning first in a direction opposite to that of flame-front front passage, then gradually rotating until finally becoming in the direction of flame-front passage, completing a turn of 180 degrees. This behavior is explained qualitatively by considering a momentum conservation and of the nature of the LDV measurements. Histories of gas-acceleration vectors in the burnt gas were derived from the LDV data, demonstrating the turbulent fluctuations that are imposed on this systematic behavior.

Flame-Flow Interaction in a Turbulent Premixed Flame (Evolution of Gas Velocity behind the Flame Fronts)