Abstract: Using the transonic area rule,the model is considered as an equivalent body of revolution and the rectangular test section is transferred into a circular test section of equal cross\|sectional area.The adjustment of the circular test section can be computed with the axisymmetrical transonic small perturbation potential equation,and then the top and bottom adjustment of the rectangular test section can be obtained.A model with blockage ratio 2.64% was tested in Northwestern Polytechnical University(NPU) 2\|D flexible wall adaptive wind tunnel.The same model was tested in Germany DLR high speed wind tunnel HKG too (blockage ratio 0.35%).Under near\|sonic conditions (\%Ma\%=0.94,0.994 and 1.008,α=0°,2°),the two results have good agreement.

Key words: wind tunnel test, transonic wind tunnel, wind tunnel walls, adaptive control