Abstract
Using computer-assisted synchronous hot-wire technique, longitudinal velocity profiles of the traveling interface wave have been mapped for a cavity excited in the vicinity of its lowest resonant mode. The shear layer perturbed by the oscillation had approximate two-dimensional symmetry for the apparatus used. Near resonance, the phase of the interface wave at the leading edge is not far from that of the local acoustic particle velocity. Vorticity fluctuations travel at a somewhat irregular pace downstream, requiring about one-half cycle to move from leading to trailing edge. Circulation reaches peak value near the center of the cavity mouth. Maximum transverse displacement amplitude of the interface is roughly equal to the width of the shear layer at midpath. Significance of the measurements for understanding the mechanism of flow-excited cavity resonance are discussed. [Work supported by Naval Ship Systems command, under a GHR contract administered by the Naval Ship Research and Development Center.]
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