On Viscous and Wind-Tunnel Wall Effects in Transonic Flows Over Airfoils.
Abstract
An extensive correlation between wind-tunnel data and finite-difference solutions of the exact potential-flow equation was performed. Two procedures are compared, one using the Kutta condition and the other using the experimental lift coefficient to determine the circulation. The numerical calculations are used to extract viscous and wall interference effects from the data. The correlation results indicate that viscous effects on lift are greater than 30%, even for turbulent boundary layers and Reynolds numbers greater than 2 x 10 to the seventh power. It is shown that viscous effects can be almost completely accounted for in numerical calculations by adjusting the circulation to match the experimental lift. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1973
- Accession Number
- AD0764133
Entities
People
- David C. Ives
- Robert E. Melnik
Organizations
- Grumman