Mean Flow and Noise Measurements In the Purdue Mach-6 Quiet-Flow

Purdue University continues to develop a 9.5-inch Mach-6 Ludwieg tube for quiet-flow operation to high Reynolds number. The aerodynamic and mechanical design were reported earlier, along with the design and testing of several facility subsystems. Here, measurements of the completed nozzle contour are reported, along with preliminary measurements of the tunnel performance. A fast transducer was used to make pitot-pressure measurements of the mean flow and fluctuations on the nozzle centerline. The run time is about 10 seconds. The mean Mach number decreases from about 6.0 at 1 atm. stagnation pressure to about 5.5 at 10 atm. The pitot-pressure fluctuations decrease from about 4% at a stagnation pressure of 1 atm. to about 1% at 10 atm. Problems with the bleed slot flow are suspected to be the cause of the lack of quiet flow; the pressure fluctuations at the geometrical minimum of the bleed slot range from 0.4% at 1 atm. to 0.2% at 10 atm.

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