ASA 127th Meeting M.I.T. 1994 June 6-10

5aSA6. Turbulent boundary layer wall pressure spatial filtering with sensors constructed of polyvinylidene fluoride (PVDF).

Jonathan L. Gershfeld

William K. Blake

CDNSWC, Code 7250, Bethesda, MD 20084-5000

John J. Gilheany

Mario Casarella

Catholic Univ., Washington, DC

Piezoelectric pressure transducers constructed of electrically polarized polyvinylidene fluoride (PVDF) were assessed as spatial filters for a spatially homogeneous turbulent boundary layer induced wall pressure field. Rectangular-shaped transducers were constructed of lengths ranging from 0.25 to 7.3 times the displacement thickness of the boundary layer in the streamwise direction and widths of 0.25 the displacement thickness. Measurements of the power spectral levels of the wall pressure fluctuations are compared for each transducer with the predicted levels determined by the integration over the spatial extent of each transducer of the Corcos model of the wall pressure cross spectrum. [Work supported by ONR.]