Abstract
The effects of intense sound waves, in a flow duct, on the measurement of static pressure are discussed. It is shown that a conventional arrangement involving a static pressure “tapping”, consisting of an orifice in the duct wall connected via a tube to a manometer, can lead to the sound field introducing significant errors in the static pressure measurement. These can be caused, at least in part, by an asymmetrical non-linear orifice resistance to the sound field, brought about by local hydrodynamic effects. A quasi-steady model based on orifice non-linearity is described, for the prediction of the errors in pressure measurement, and it is shown that this can yield reasonable results, taking into account the various causes of prediction inaccuracy.
Published Version
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