An NACA transonic test section with tapered slots tested at Mach numbers to 1.26

Vernon G. Ward, Charles F. Whitcomb, Merwin D. Pearson
naca-rm-l50b14
Mar 1950


An NACA octagonal transonic slotted test section has been modifies to include slots with point origins located at the tunnel aerodynamic minimum and which diverged linearly over a length of one and one-half jet diameters. The uniformity of the supersonic flow along the axis of this configuration was investigated and an indication of interference effects on a body of revolution was obtained.

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http://naca.central.cranfield.ac.uk/reports/1950/naca-rm-l50b14.pdf