VISCOUS REGION OF TURBULENT BOUNDARY LAYER

The nature of mean and turbulent motion in the viscous sublayer of a thick boundary layer with zero pressure gradient was investigated. Measurements were made of the mean motion, two of the turbulent velocity components, the turbulent shear stress, and spectra of the longitudinal component of the velocity fluctuation. Traverses were made through approximately one-fifth of the boundary layer, which was approximately 32 inches thick. The boundary layer was developed along the floor of the wind tunnel test section for 85 feet. The turbulent shear stresses and the turbulence intensities were evaluated from a single rotated wire. A detailed account is given of the theory concerning the yawed wire operation. Included are corrections for the results from normal and yawed hot wires when operated in large mean velocity gradients and/or turbulence intensity gradients. (Author)