This grant supported research into quiet-flow supersonic wind-tunnels, between May 1990 and December 1994. Quiet-flow nozzles operate with laminar nozzle-wall boundary layers, in order to provide low-disturbance flow for studies of laminar-turbulent transition under conditions comparable to flight. Major accomplishments include: (1) the design, fabrication, and performance-evaluation of a new kind of quiet tunnel, a quiet-flow Ludweig tube; (2) the integration of preexisting codes for nozzle design, 2D boundary-layer computation, and transition-estimation into a single user-friendly package for quiet-nozzle design; and (3) the design and preliminary evaluation of supersonic nozzles with square cross-section, as an alternative to conventional quiet-flow nozzles. After a brief summary of (1), a description of (2) is presented. Published work describing (3) is then summarized. The report concludes with a description of recent results for the Tollmien-Schlichting and Gortler instability in one of the square nozzles previously analyzed.
Development of quiet-flow supersonic wind tunnels for laminar-turbulent transition research
1994-12-01
Report
No indication
English
LAMINAR-TURBULENT TRANSITION CORRELATIONS IN SUPERSONIC/HYPERSONIC FLOW
British Library Conference Proceedings | 2006
|Laminar-Turbulent Transition Research in the Purdue Mach-4 Quiet-Flow Ludwieg Tube
British Library Conference Proceedings | 1996
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