Accession Number : AD0636323

Title :   UPSTREAM HISTORY AND APPARENT STRESS IN TURBULENT BOUNDARY LAYERS.

Descriptive Note : Technical rept. for Oct 65-May 66.

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE GAS TURBINE LAB

Personal Author(s) : Goldberg, Perry

Report Date : MAY 1966

Pagination or Media Count : 112

Abstract : A comprehensive experimental and analytical study specifically designed to investigate upstream history and apparent stresses in incompressible, two-dimensional, turbulent boundary layers has been conducted. Hot-wire measurements of turbulent shear stress and longitudinal turbulence intensity, as well as velocity profiles and wall shear stress measurements, were made for six different pressure distributions. It was found that the turbulent shear stress is dependent upon the upstream history of the flow and not a unique function of the local velocity profile. A simple equation for the dissipation integral with a constant K was found to represent the data well. This expression was used with the mean-flow energy integral equation to obtain a practical method for predicting turbulent boundary layer behavior which accounts for upstream history. The predictions made with this method for the six pressure distributions of this study and for others extracted from the literature agreed well with the experimental data. (Author)

Descriptors :   (*TURBULENT BOUNDARY LAYER, THEORY), TWO DIMENSIONAL FLOW, INCOMPRESSIBLE FLOW, STRESSES, MATHEMATICAL ANALYSIS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE