An Investigation of Separation Models for the Prediction of Cl sub max.
Abstract
Steady and unsteady analyses and computational methods have been developed for calculating the flow about two-dimensional airfoils up to and beyond the stall. The steady-flow method adopts an iterative procedure between the potential flow an d boundary layer solutions. The separated region is modeled in the potential flow analysis using free vortex sheets which require an inner iteration to establish their shapes. The free vortex sheet length is an important parameter in the potential flow calculation. Calculated and experimental results are compared for a GA (W) -1 airfoil and for several NACA airfoil series over a range of Reynolds numbers. The calculated results, which include pressure, distributions as well as force and moment characteristics, are in very close agreement with experimental results, and are obtained for reasonable computing costs; typically, one incidence data point takes 15 to 20 c.p. seconds on a CDC 7600 computer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1979
- Accession Number
- ADA068108
Entities
People
- Balusu M. Rao
- Brian Maskew
- Frank A. Dvorak