| タイトル | Compliant wall-turbulent skin-friction reduction research |
| 著者（英） | Ash, R. L.; Weinstein, L. M.; Bushnell, D. M.; Fischer, M. C. |
| 発行日 | 1975-06-01 |
| 言語 | eng |
| 内容記述 | Previous compliant-wall experiments successful in reducing skin-friction drag probably have had a (unplanned) membrane resonance at a favorable frequency, amplitude, wave shape, length, and speed. The most probable drag reduction mechanism involves a direct coupling between the fluid and the moving wall when the wall natural resonance frequencies are near the fundamental turbulent burst frequency. Local skin-friction reductions of 61% were measured with mylar/PVC plastisol compliant surfaces. These reductions were observed only at certain flow conditions, indicating that changing tunnel total temperature may have altered the substrate dynamic modulus, damping, and coupled mylar tension. Apparently, the coupled membrane/substrate must be excited in compatible narrow-band natural frequency modes. An accelerated effort is required to develop practical durable compliant surfaces optimized for maximum drag reduction. Application of compliant walls to other transportation modes appears feasible with liquid flows offering the greatest skin-friction drag reduction potential. |
| NASA分類 | AERODYNAMICS |
| レポートNO | 75A33930
AIAA PAPER 75-833 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/447899 |
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