Abstract
Abstract : Tests were conducted in the wind tunnel, to determine the tunnel calibration and centerline Mach number distributions. The wall porosity in the test section is remotely variable using a sliding cutoff plate design. The walls were recently modified to allow upstream movement of these cutoff plates instead of the original downstream movement for decreasing porosity. During the tests, Mach number was varied from 0.10 to 1.35, test section wall angle from -0.5 to 0.5 deg, test section wall porosity from 0- to 10-percent open area, and stagnation pressure from 1000 to 3500 psfa. Some data were obtained showing the effects of humidity. Acceptably uniform Mach number distributions were obtained at wall porosities up to 7-percent open area, a marked improvement over the original wall design. The tunnel plenum-stream calibration relationship was determined to be dependent upon Mach number, wall angle, wall porosity, and humidity but nominally independent of stagnation pressure level.
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