Accession Number:

AD0669004

Title:

JETS AND WAKES IN TAILORED PRESSURE GRADIENT,

Descriptive Note:

Corporate Author:

BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH FLIGHT SCIENCES LAB

Personal Author(s):

• Wygnanski,I.
• Fiedler,H. E.

Report Date:

1968-02-01

Pagination or Media Count:

40.0

Abstract:

Similarity solutions of the boundary layer equations representing the flow of jets in an external stream and tailored pressure gradients were obtained. These solutions apply to jets in co-flowing and counter-flowing streams. A number of analytical solutions not previously published were obtained. Of particular interest are the solutions for small increment jets which imply that a Gaussian velocity profile exists far downstream from the origin of the jet, even in arbitrary pressure gradient. The solutions were extended to turbulent flow using the hypothesis of a constant eddy viscosity, which, in turn, was modified to account for intermittency. The theoretical predictions were compared with the measurements of Gartshore in self-preserving wakes and the agreement between theory and experiment is good. Author

Descriptors:

• *JET MIXING FLOW
• PRESSURE
• WAKE
• BOUNDARY LAYER
• EQUATIONS OF MOTION
• VELOCITY
• TURBULENCE
• VORTICES
• INCOMPRESSIBLE FLOW
• TWO DIMENSIONAL FLOW
• FLOW FIELDS
• AXISYMMETRIC FLOW
• TABLES(DATA)

Subject Categories:

• Aerodynamics
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE