Advances in Fluid Mechanics Measurements pp 201-227 | Cite as

# Dynamic Wall Pressure Measurements

## Abstract

The quest for information on the dynamics of wall pressure fluctuations has been motivated by two principle objectives. The first is to gain more fundamental understanding of the turbulent boundary layer, in particular, the mechanism by which it continually regenerates itself. The wall pressure measurement has the advantage of being, for the most part, non-invasive. On the other hand, it is a weighted integral of the velocity fluctuations in the boundary layer, hence, its picture of boundary layer activity must of necessity be somewhat diffuse. Pressure measurements have been combined with other measurements, in particular, fluctuating velocity and fluctuating wall shear stress. These have taken the form of long-time averages, such as in cross-correlation and cross-spectral density measurements. Short time conditional average measurements have also been taken wherein one or the other of the physical quantities has served as the trigger. A blend of the two techniques has been employed in measuring wall pressure fluctuations in the transition zone between laminar and turbulent flow. The pressure measurement is today an integral part of any serious experimental study of boundary layer dynamics.

## Keywords

Wall Shear Stress Turbulent Boundary Layer Wall Pressure Acoustic Radiation Wavenumber Spectrum## Preview

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