Abstract
A new method for estimating blockage corrections is described which relates wall static pressure measurements at the test section entry and exit directly to the interference velocities experienced at the model. Model, rig, and power effects are included. Using this method, tests on a 20 in. jet flap model in a 42 in. wide tunnel correlated well with free air results in a large tunnel. The highest test lift coefficient was 15 and a moving ground was used. Theoretical and experimental studies are described concerning the use of a tangentially blown wind tunnel floor to replace a moving ground. Tests on the above model, at one chord altitude, confirm the feasibility of this approach. Applications of the new procedures are described and discussed. AT C CD CL
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