TY - GEN
T1 - Influence of non-axisymmetric perturbations on the hole-tone feedback cycle
T2 - 35th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2006
AU - Langthjem, Mikael A.
AU - Nakano, Masami
PY - 2006/12/1
Y1 - 2006/12/1
N2 - The paper is concerned with the hole-tone feedback cycle problem, also known as Rayleigh's bird-call. A methodology for analyzing the influence of non-axisymmetric perturbations of the jet on the sound generation is described. These perturbations are applied at the jet nozzle via piezoelectric or electro-mechanical actuators, placed circumferentially inside the nozzle at its exit. The mathematical model is based on the discrete vortex method, using vortex fllament rings. The nozzle and the holed end-plate are represented by bound (fixed) axisymmetric vortex rings. The shear layer of the jet and the actuator-equipped downstream section of the nozzle are represented by three-dimensional vortex fllaments. The sound generation is described mathematically using the Powell-Howe theory of vortex sound. The ultimate aim of the work is to control the flow and the accompanying sound generation.
AB - The paper is concerned with the hole-tone feedback cycle problem, also known as Rayleigh's bird-call. A methodology for analyzing the influence of non-axisymmetric perturbations of the jet on the sound generation is described. These perturbations are applied at the jet nozzle via piezoelectric or electro-mechanical actuators, placed circumferentially inside the nozzle at its exit. The mathematical model is based on the discrete vortex method, using vortex fllament rings. The nozzle and the holed end-plate are represented by bound (fixed) axisymmetric vortex rings. The shear layer of the jet and the actuator-equipped downstream section of the nozzle are represented by three-dimensional vortex fllaments. The sound generation is described mathematically using the Powell-Howe theory of vortex sound. The ultimate aim of the work is to control the flow and the accompanying sound generation.
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M3 - Conference contribution
AN - SCOPUS:84867966356
SN - 9781604231366
T3 - Institute of Noise Control Engineering of the USA - 35th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2006
SP - 1505
EP - 1513
BT - Institute of Noise Control Engineering of the USA - 35th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2006
Y2 - 3 December 2006 through 6 December 2006
ER -