Accession Number:

ADA071436

Title:

Measured Blockage Effects on Bluff Bodies in Closed and Open Wind Tunnels.

Descriptive Note:

Technical rept.,

Corporate Author:

ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)

Personal Author(s):

• Owen,T. B.

Report Date:

1978-12-01

Pagination or Media Count:

20.0

Abstract:

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

Descriptors:

• *WIND TUNNEL TESTS
• *FLAT PLATE MODELS
• *BASE PRESSURE
• WAKE
• AERODYNAMIC DRAG
• BLOCKING
• DYNAMIC PRESSURE
• BLUNT BODIES
• CORRECTIONS
• UNITED KINGDOM

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE