Design and Fabrication of a 9.5-inch Mach-6 Quiet-Flow Ludwieg Tube

A high Reynolds-number Mach-6 quiet-flow Ludwieg tube is being developed at Purdue University, based on the existing Mach-4 Ludwieg tube. The design is almost complete and fabrication is about half complete. The 9.5-inch nozzle was designed with e**N methods in order to maintain a laminar nozzle-wall boundary layer, as described earlier. The mechanical design of the nozzle is sketched. In addition, boundary-layer separation should be eliminated in the contraction and driver tube, in order to reduce residual noise that will propagate into the test section via acoustic or convective means. The contraction and bleed-lip design was carried out using the Rott-Crabtree method and an axisymmetric panel-method code. Matched cubics were used for the contraction shape, as suggested by Morel (1975). The detailed design of the driver tube, contraction, and nozzle is described.

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