This study presents a comprehensive characterisation of the local dynamic response of a flame to an acoustic forcing. In the experiments, a laminar non-premixed jet flame was subjected to fuel flow perturbation driven by a loudspeaker. Acoustic forcing of the fuel flow rate is used to phase-lock the periodic flame flicker close to the natural flicker frequency. The temperature and the soot field of the forced flame were measured using planar two-line atomic fluorescence (TLAF) and planar laser-induced incandescence (LII), respectively. Time-resolved LII was employed to measure the diameter of primary soot particles in the flame. The position of the reaction zone of the flame was measured using planar laser induced fluorescence (LIF) of the hydroxyl radical (OH). The resulting images were phase-resolved and averaged to yield a complete cycle of flame flickering with fine temporal and spatial resolution. The results shed light on the interdependency of the measured parameters and show that the soot production is greater for the forced condition than for the steady counterpart.
|Original language||English (US)|
|Title of host publication||11th Asia-Pacific Conference on Combustion, ASPACC 2017|
|State||Published - Jan 1 2017|