Y. Kang et al., TRANSPORT ENHANCEMENT IN ACOUSTICALLY EXCITED CAVITY FLOWS, PART 1 - NONREACTIVE FLOW DIAGNOSTICS, AIAA journal, 36(9), 1998, pp. 1562-1567
Acoustically driven, nonreactive flow processes in a two-dimensional d
ump combustor cavity were explored experimentally. Particle image velo
cimetry in the device was used to quantify the time-dependent, phase-l
ocked velocity field in the cavity, Cavity operation during external a
coustic excitation and during natural (undriven) operating conditions
was explored, Interrogation of this flowfield showed quantifiable incr
eases in inlet core/jet width, enhanced rates of entrainment between j
et and recirculation regions, and increased jet rms velocity fluctuati
ons during external forcing at frequencies corresponding to resonant l
ongitudinal modes of the device. No such enhancement was observed duri
ng off-resonance external excitation. These results suggest that exter
nal acoustic excitation at resonant modes can result in enhanced mass
and momentum transport within the cavity Bow, providing a potentially
powerful method for active Bow central.