A rapid technique for measuring and visualizing the extent of separated flow
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Abstract
A method is described for rapidly measuring and visualizing the extent of separated flow suitable for a wind tunnel environment. The method utilizes a continuously swinging total pressure probe. This technique permits acquiring and presenting graphical records of separated regions in a fraction of the time required by other methods. Typical results indicate the presence of highly complicated three-dimensional separated regions for a typical general aviation twin-engine aircraft at post-stall conditions.
Keywords
Wind Tunnel Total Pressure Typical Result Separate Region Separate FlowList of Symbols
- c
wing mean geometric chord
- cpt
total pressure coefficient, (PT-PS)/q∞
- PS
static pressure
- PT
total pressure
- q∞
free stream dynamic pressure
- q
local dynamic pressure
- r
radial direction
- x
streamwise coordinate (x=0 corresponds to leading edge of wing)
- α
angle of attach
- ϕ
azimuth direction
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References
- Crowder, J. P. 1980: Quick and easy flow-field surveys. Aeronautics Astronautics, 38–45Google Scholar
- Kiel, G. 1935: A total-head meter with small sensitivity to yaw. NACA TM 775Google Scholar