论文信息 - Wake Blockage Corrections and Ground Effect Testing in Closed Wind Tunnels

Wake Blockage Corrections and Ground Effect Testing in Closed Wind Tunnels

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

J. E. Hackett | R. A. Boles

[1] M. R. Evans,et al. Vortex wakes behind high-lift wings , 1971 .

[2] A. Pope. Basic Wing and Airfoil Theory , 1951 .

[3] V. Lyman,et al. The jet flap in three dimensions - Theory and experiment , 1973 .

[4] H. Glauert. Wind Tunnel Interference on Wings, Bodies and Airscrews , 1933 .

[5] E. B. Praytor,et al. Ground effect for V/STOL aircraft configurations and its simulation in the wind tunnel. Part 2: Experimental studies , 1972 .

[6] J. E. Hackett,et al. Ground effect for V/STOL aircraft configurations and its simulation in the wind tunnel. Part 1: Introduction and theoretical studies , 1972 .

[7] John G Herriot,et al. Blockage Corrections for Three-Dimensional-Flow Closed-Throat Wind Tunnels, With Consideration of the Effect of Compressibility , 1950 .