Accession Number : ADA136980

Title :   Predicting the Onset of Turbulence in the Presence of a Pressure Gradient.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Charles,R D

PDF Url : ADA136980

Report Date : Dec 1983

Pagination or Media Count : 74

Abstract : An analytical study is presented regarding the determination of a pressure gradient dependent criterion for flow transition from laminar to turbulent flow. The results obtained were derived from two parallel approaches to flow stability; one of wave-dependent stability and the other of vorticity-dependent stability. In both cases, one of a variable transition Reynolds number dependent upon the ambient pressure gradient and the other one of a constant transition Reynolds number bases on the boundary-layer displacement thickness, the prediction results were either as good or better than those from available prediction methods. In addition these two criteria were used to predict transition locations on a NACA 0018 airfoil, again with favorable results. (Author)

Descriptors :   *Boundary layer transition, *Pressure gradients, *Turbulent flow, Mathematical prediction, Laminar flow, Stability, Vortices, Reynolds number, Variables, Constants, Boundary layer, Displacement, Thickness, Momentum, Interactions, Boundary layer flow, Adverse conditions, Position(Location), Airfoils, Theses

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE