Effect of Model Size in the AFOSR--Notre Dame Large Mach-6 Quiet Tunnel

What is it about?

This paper investigates the maximum model size the AFOSR Notre Dame Large Mach 6 Quiet Tunnel can handle while still operating properly. A blunt model design inspired by the Mars Pathfinder Probe entry capsule was used to mimic a "worse case scenario". Stagnation pressures and background oriented schlieren were used to evaluate the tunnel starting mechanics. Under certain tunnel conditions, exceptionally long tunnel run times were observed.

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Why is it important?

This study provides insight for the future use of similar tunnels with large flight-vehicle models and the limitations that may be imposed when operating with such test articles.