Recent turbulent drag reduction research at Langley Research Center
Abstract
Three areas are discussed: oscillatory longitudinal curvature, large eddy breakup devices, and small longitudinal surface striations. The first two concepts produced sizable local turbulent skin friction reductions, but further research is required to optimize the effect, reduce parasitic device drag, and provide a net increase in vehicle performance. The surface striations, due to large wetted area increased for a given planform, have not yet yielded a planform-averaged skin friction reduction. Heat transfer data indicated such surfaces may have useful application in heat exchangers.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- March 1978
- Bibcode:
- 1978STIN...7820461B
- Keywords:
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- Drag Reduction;
- Turbulent Flow;
- Curvature;
- Fuselages;
- Heat Exchangers;
- Heat Transfer;
- Oscillations;
- Skin Friction;
- Striation;
- Fluid Mechanics and Heat Transfer