An Investigation of Several Slotted Wind Tunnel Wall Configurations with a High Disc Loading V/STOL Model
Final rept. 1 Jul 1966-30 Jun 1970
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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The investigation reported herein is the experimental portion of a unified theoretical and experimental search for a slotted wind tunnel wall configuration with minimal interference for conventional and VSTOL models. It is shown that theory and experiment are in excellent agreement for the classical case provided an appropriate expression is used to relate the wall geometry to the boundary condition. Classical data correction equations are not appropriate for the VSTOL case, however. An additional term, not predicted by theory, is needed to account for changes in the jet wake. Geometric parameters which influence the wall interference quantities are indicated. Wall configurations are shown which will produce interference-free force data to a jet-to-free- stream velocity ratio of 4.5.
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