Noise generation by flow through an orifice

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1972

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Abstract

The phenomenology of flow through an orifice in a pipe and Lighthill's theory of jet noise are reviewed. Sound pressure level and intensity, due to subsonic air flow through various circular orifices in a straight hard-wall pipe have been measured as a function of fluid parameters and orifice geometry. Some possible methods of noise abatement were also explored. It was concluded that the noise generated by an orifice inside a pipe is similar to that from a subsonic free jet. The noise is sensitive to orifice diameter, pressure differential, pressure ratio, and Mach Number, and increases with increase of these parameters. The noise also increased with increasing but low values of Reynolds Number.

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