Abstract

An ethylene-air diffusion flame was acoustically forced with a frequency of 100 Hz at four amplitudes ranging from 40% to 140%. The average bulk velocity of the fuel was 0.6 m/s. The soot distribution and velocity fields were measured by simultaneous two-dimensional laser-induced incandescence (LII) and stereo particle image velocimetry (PIV) at 20 kHz laser repetition rate. The LII signal was calibrated by pulse-to-pulse laser energy variation, and it was observed that the soot regions extended along the central axis of the flame and shrank radially under acoustic forcing compared with the steady flame. The volume fraction of soot in the acoustically forced flame decreased with increased acoustic driving. In addition, the PIV results revealed that the resident time was strongly associated with the formation of an oval-shaped soot region, which was induced by external acoustic forcing.

© 2019 Optical Society of America

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Supplementary Material (1)

NameDescription
» Visualization 1       The video shows contours of residence time of virtual fluid particles departing from 5 phases and superimposed with the LII signal for 4 a values. From top to bottom, the five contours are corresponding to phase 0°, 90°, 180°, 270° and 360°.

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