Analysis of Limit Cycle Oscillation/Transonic High Alpha Flow Visualization
Final technical rept. 30 Sep 94-30 Sep 97
LOCKHEED MARTIN CORP FT WORTH TX TACTICAL AIRCRAFT SYSTEMS
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A flow visualization test was conducted with the simple straked wing in August, 1996 at the National Aerospace Laboratory NLR, The Netherlands, for the purpose of obtaining flow visualization data to compliment the pressure and force data base generated in earlier tests of the same configuration. This tests was conducted in two parts to examine the flow field characteristics 1 at high alpha conditions that involve vortices, shocks, and separated flows, and 2 at low alpha condition typical of transonic LCO flows with and without tip stores. Laser light sheetwater vapor techniques were used to illuminate the flows, and video recording was used to obtain the data. Both low and high speed video cameras were used to examine spanwise and streamwise laser sheet positions. In addition, under NLR funding, some preliminary particle image velocimetry PIV data were obtained at M 0.225 and 0.6, as well as some pulsed laser flow visualization 9 nano-sec pulse at M 0.9. Correlation was performed between the flow visualization data from this test and the pressureforce data obtained in 1992 on the same configuration.
- Fluid Mechanics