Experimental Study On The Oscillation Of A
Separating Shear Layer In A Cavity
Author(s)
Y. Inoue & S. Yamashita
Abstract
This study was performed to clarify the oscillation of a separating shear layer in
a cavity formed peripherally on a cylinder in a uniform axial stream.
Experiments were conducted on the cavity having the width-depth ratio of 4 and
formed in a water channel. Firstly, the dynamic characteristics of the flow field
were investigated by visualizing the flow, and a time-averaged flow field was
measured with a particle imaging velocimetry (PIV). As a result, the typical
three flow patterns were demonstrated. Secondly, spatiotemporal measurements
were taken along and/or across the shear layer with a UVP monitor. Thirdly, the
proper orthogonal decomposition was applied to the UVP dataset, and random
coefficients at the low-order POD modes were examined. As a result, two
dominant time scales of f b/Um = 0.1 and 0.9 were found in the shear layer. These
two-scale flow structures can be shown through filtration with discrete wavelet
transformation.
Keywords: cavity flow, self-sustaining oscillation, ultrasonic Doppler method,
wavelet analysis, POD.
1 Introduction
In many cases, the flow passing across an open cavity generates self-exited
oscillation, causing two major problems: radiating noise and fluid induced
oscillation. Although the characteristics of cavity oscillation have been studied in
recent decades, there are still some problems that remain unsolved even today.
The details of these problems were perused by Rockwell and Naudascher [1] and
Grace [2] in their prospective papers and by Lin and Rockwell [3] and Howe [4].
Keywords
cavity flow, self-sustaining oscillation, ultrasonic Doppler method,
wavelet analysis, POD.
Related Book
Other papers in this volume
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