Flow Separation Induced by Periodic Aerodynamic Interference
Abstract
Analysis of experimental surface pressure distributions on an NACA 0012 airfoil has revealed four flow states: attached, separated, borderline, and dynamically separated. The important parameters that determine the flow state are Reynolds number, reduced frequency, airfoil angle of attack, and surface condition at the leading edge. Testing was done at Re=700,000, .5<=k<=6.4, and 0<=alpha<=18 degrees. For this flow the dynamically separated state takes the form of an alternation between attached and separated flow. It has a period that ranges from 1 to 30 times that of the unsteady perturbation. In the separated state a convected surface pressure disturbance was identified, and found to propagate downstream from a location near the leading edge at a phase speed of 1/3 to 1/2 that of the freestream velocity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1984
- Accession Number
- ADP004174
Entities
People
- C. M. Vaczy
- E. E. Covert
- P. F. Lorber
Organizations
- Massachusetts Institute of Technology