Accession Number:

ADA067913

Title:

A Viscous/Potential Flow Interaction Analysis for Circulation-Controlled Airfoils.

Descriptive Note:

Final rept.,

Corporate Author:

ANALYTICAL METHODS INC BELLEVUE WASH

Personal Author(s):

• Dvorak,F. A.

Report Date:

1978-05-01

Pagination or Media Count:

52.0

Abstract:

A method developed for the analysis of the incompressible viscous flow over circulation-controlled airfoils is described. A surface vorticity method is used to solve the inviscid portion of the flow and a combination of integral and finite difference methods is used to calculate the development of the viscous layers. An iterative process is used to arrive at final solutions which satisfy an appropriate trailing-edge condition and incorporate the interaction between the viscous and potential regions of the flow. Comparisons between calculated and experimental results show good agreement for surface pressure distributions and lift coefficients over a range of blowing momentum coefficient from 0 to 0.12. A discussion of the possibility of Coanda jet detachment when circulation-controlled airfoils are operating at high subsonic Mach Numbers is included in an Appendix. Author

Descriptors:

• *VISCOUS FLOW
• *BOUNDARY LAYER CONTROL
• *POTENTIAL FLOW
• VORTICES
• AIRFOILS
• FINITE DIFFERENCE THEORY
• COEFFICIENTS
• INTEGRAL EQUATIONS
• LIFT
• ITERATIONS
• PRESSURE DISTRIBUTION
• INCOMPRESSIBLE FLOW
• MOMENTUM
• COANDA EFFECT

Subject Categories:

• Aircraft
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE