ホールトンフィードバック問題での自励流体振動の制御

抄録

This lecture is concerned with a numerical study of the hole-tone　feedback problem, involving sound generation from a round jet impinging　on a plate with a hole of same diameter as the jet nozzle. The sound-generating flow is modelled by a discrete vortex method; the sound　generation is evaluated by the Powell-Howe theory of vortex sound　and the boundary element method.　The fundamental dynamics is studied in terms of an axi-symmetric model.　Following this, sound control by piezoelectric actuators placed around the inner circumference of the jet　mouth is studied in terms of a full three-dimensional model.