An Investigation was made In. a 5- by 5-inch transonic test section of the wave attenuating capabilities of a variety of perforated-wall configurations both with and without the use of outflow. The evaluation was made by comparing static-pressure measurements on a body of revolution from tests in a 5- by 5-inch test section with those from tests of the identical model in the Ames 2- by 2-foot transonic wind tunnel.nThe test results indicated that reflected disturbances could be minimized through the Mach number range tested (M = 1.0 to 1.36) either by varying the outflow through walls of constant porosity, or by varying the wall porosity at constant low outflow. At sonic speed only a very low-porosity wall yielded minimum Interference.
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