| タイトル | The fix for tough spots |
| 著者（英） | Bushnell, Dennis M.; Anders, John B.; Walsh, Michael J. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 1988-01-01 |
| 言語 | eng |
| 内容記述 | Modern turbulence-control techniques are discussed. Particular atention is given to retrofit techniques such as riblets and large-eddy breakup (LEBU) devices which use passive elements suitable for a variety of existing vehicles with minimum added complexity. Riblets are small flow-aligned grooves in the aircraft skin that damp turbulence and reduce skin friction; the mechanism of riblet drag reduction derives from the enhancement of turbulence-altering, transverse viscous forces by strong spanwise surface geometry gradients. LEBUs are thin plates or ribbons suspended in a turbulent boundary layer to sever or break up the large vortices that form the convoluted outer edge of the layer. Other turbulence-control techniques are discussed, including one that involves the injection of control vortices into the turbulent boundary layer to modify or substitute for large-eddy structures. |
| NASA分類 | AERODYNAMICS |
| レポートNO | 88A20940 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/373338 |
|
