Effects of Streamwise Pressure Gradients on Turbulence Structure in the Viscous Layer
Abstract
In order to provide bases for hydroacoustic models predicting wall pressure fluctuations in turbulent boundary layers, time series measurements with an X-probe and a wall shear stress sensor were obtained simultaneously in an oil channel both for fully-developed and for laterally-converging flows. Data were concentrated in the viscous layer at y = 5, 7, 10, 15, 25 and centerplane for K sub p = (nu/rho u-cubed)dp/dx = -0.008 to -0.02 (slight to highly favorable pressure gradients). Results presented include comparisons of the profiles of the mean statistics, plus correlations, of u, v, uv and t sub w. The mean profile u (y) increased and the correlation coefficients Ruu (y approx 15, tau*), Ruv (15 tau*) and R sub(u tau) (15, tau*) broadened with an increase in the magnitude of K sub p over this range. However, the turbulence statistics u'(y)/ut, v'(y)/u, S sub u (y) and F sub u (y) as well as the maximum amplitudes of R sub uv (15, tau) and R sub u tau (15, tau) suffered no significant effect. Keywords: Hydrodynamics, Hydroacoustics, Fluid mechanics, Turbulence structure, Hot film anemometry, Viscous wall layer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 13, 1990
- Accession Number
- ADA225048
Entities
People
- Donald M. Mceligot
- Helmut Eckelmann