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http://dx.doi.org/10.3795/KSME-B.2012.36.11.1055

Characteristics of Wall Pressure over Wall with Permeable Coating  

Song, Woo-Seog (Dept. of Mechanical Engineering, Inha Univ.)
Shin, Seung-Yeol (Dept. of Mechanical Engineering, Inha Univ.)
Lee, Seung-Bae (Dept. of Mechanical Engineering, Inha Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.36, no.11, 2012 , pp. 1055-1063 More about this Journal
Abstract
Fluctuating wall pressures were measured using an array of 16 piezoelectric transducers beneath a turbulent boundary layer. The coating used in this experiment was an open-cell, urethane-type foam with a porosity of approximately 50 ppi. The ultimate objective of the coating is to provide a mechanical filter to reduce the wall pressure fluctuations. The boundary layer on the flat plate was measured by using a hot wire probe, and the CPM method was used to determine the skin friction coefficient. The wall pressure autospectra and streamwise wavenumber-frequency spectra were compared to assess the attenuation of the wall pressure field by the coating. The coating is shown to attenuate the convective wall pressure energy. However, the relatively rough surface of the coating in this investigation resulted in a higher mean wall shear stress, thicker boundary layer, and higher low-frequency wall pressure spectral levels compared to a smooth wall.
Keywords
Permeable Wall; Wavenumber-Frequency Spectrum;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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