PIV Measurements of Aeroacoustic Sources of a Shallow Cavity in a Pipeline

[+] Author and Article Information
Mohamed Saber

Research Assistant, Mechanical Dept., McMaster University, Hamilton, Ontario, Canada

Ziada Samir

Professor, Mechanical Dept., McMaster University, Hamilton, Ontario, Canada

1Corresponding author.

ASME doi:10.1115/1.4039920 History: Received November 29, 2017; Revised April 02, 2018


The aeroacoustic sources generated by flow over a ducted shallow cavity in the presence of a longitudinal plane sound wave are examined at various Strouhal numbers and sound intensities. The cavity is exposed to high Reynolds number fully developed pipe flow. Extensive PIV flow measurements are performed to characterize the unsteady velocity field and finite element analysis is used to obtain the acoustic velocity field. Howe's aeroacoustic integrand is then used to compute the spatial and temporal distributions of the aeroacoustic sources resulting from the cavity shear layer interaction with the sound field. The results show two aeroacoustic sources separated by a sink along the cavity shear layer. This distribution is different from that reported for the closed side-branch resonance case, which shows a single source at the downstream corner and a sink at the upstream corner of the cavity. The effect of the upstream corner geometry in the present case is therefore expected to be different from the case of side-branch resonance. The time-averaged sound power distribution is computed and the total sound power per cycle is compared with the aeroacoustic source strength measured by means of the Standing Wave Method (SWM) [1]. The merits of these two methods in determining the aeroacoustic sources are highlighted.

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