Measured Blockage Effects on Bluff Bodies in Closed and Open Wind Tunnels.
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)
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The base pressure of a series of square flat plates, placed normal to the airstream, has been measured in three wind tunnels, two with a closed test section and one with an open test section. The measurements in the closed tunnels are in fair agreement with the theory due to Maskell which predicts a correction linearly dependent on C sub D SC. A correction of -0.2 x the closed tunnel correction is a fair approximation to the blockage effect in the open tunnel for C sub D SC 0.03 though, for larger blockage, a dependence on C sub D SC -squared seems more appropriate. Author
- Fluid Mechanics