Wall pressure transducer spatial resolution

Richard M. Lueptow*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


The accuracy of measurements of the wall pressure beneath a turbulent boundary layer is affected by the size of the pressure transducer because of spatial averaging over the sensing area of the transducer. The effect of transducer size on the wall pressure spectrum was investigated by numerically applying wavenumber filters corresponding to various size and shape transducers to a database of wall pressure generated from a direct numerical simulation of turbulent channel flow. Circular transducers with piston-type and deflection-type sensitivities were modeled along with square transducers with piston-type sensitivity. A deflection-type transducer attenuates the rms wall pressure less than a piston-type transducer of the same area. The wavenumber spectrum of the wall pressure measured using a large transducer has lobes and zeros corresponding to those in the wavenumber response function of the transducer. These lobes and zeros in the wavenumber spectrum are also evident in the frequency spectrum, although they are smeared. Using Taylor's frozen field hypothesis, an upper bound on the frequency of wall pressure fluctuations that can be measured before the zeros in the wavenumber response function affect the wall pressure spectrum is given in terms of the convection velocity and the dimensions of the transducer.

Original languageEnglish (US)
Title of host publicationFlow Noise Modeling, Measurement, and Control
EditorsTheodore M. Farabee, William L. Keith, Richard M. Lueptow
PublisherPubl by ASME
Number of pages7
ISBN (Print)0791810054
StatePublished - Dec 1 1993
EventProceedings of the 1993 ASME Winter Annual Meeting - New Orleans, LA, USA
Duration: Nov 28 1993Dec 3 1993

Publication series

NameAmerican Society of Mechanical Engineers, Noise Control and Acoustics Division (Publication) NCA


OtherProceedings of the 1993 ASME Winter Annual Meeting
CityNew Orleans, LA, USA

ASJC Scopus subject areas

  • Mechanical Engineering
  • Acoustics and Ultrasonics


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