Accession Number : AD0762152

Title :   A Re-Evaluation of Zero Pressure Gradient Compressible Turbulent Boundary Layer Measurements

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Danberg, James E

PDF Url : AD0762152

Report Date : Apr 1973

Pagination or Media Count : 26

Abstract : A number of compressible turbulent boundary layer velocity and temperature profiles with zero pressure gradient were collected and prepared for computer analysis. An assumed equation for these profiles was chosen allowing four constants to be adjusted by a nonlinear least squares technique to fit the experimental data. The four constants are: velocity scale, boundary layer thickness, constant of the semi-log region, and wake constant. This equation is analogous to Cole's incompressible law of the wall and wake but uses a generalized velocity to account for compressibility. Measurements from 45 adiabatic wall tests were analyzed covering a Mach number range from 2 to 6 and a momentum thickness Reynolds number range from 2300 to 750,000. (Modified author abstract)

Descriptors :   *COMPRESSIBLE FLOW, *TURBULENT BOUNDARY LAYER, COMPUTER PROGRAMMING, EQUATIONS OF MOTION, FLAT PLATE MODELS, PRESSURE, SCALE, SHEAR STRESSES, SKIN FRICTION, STATISTICAL DISTRIBUTIONS, THERMAL PROPERTIES, THICKNESS, VELOCITY, WAKE

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE