阻力危機
阻力危機是一種流體力學的現象，是流場的雷諾數增加到一定程度時，其阻力係數突然下降的現象。針對圓形物體（例如球或是圓柱）的阻力危機現象已有詳盡的研究[1] 。當雷諾數增加到大約300000時，阻力係數會快速的由0.5變成0.2，此時會產生較窄的湍流尾流。阻力危機的現象也和物體的表面粗糙度有關[2]。
参考文献
[编辑]- ^ Robert W. Fox, Alan T.McDonald. Introduction to Fluid Mechanics. USA: John Wiley & Sons. 1994: p.421~423. ISBN 0-471-59274-9.
- ^ 吴玉林. 应用流体力学. 北京: 清华大学出版社. 2006: p.7. ISBN 7302121079.
外部連結
[编辑]- Simulating Drag Crisis for a Sphere Using Skin Friction Boundary Conditions (PDF). [2008-10-24]. （原始内容存档 (PDF)于2011-06-05）.
- Flow past a cylinder: Shear layer instability and drag crisis (PDF). [2008-10-24]. （原始内容存档 (PDF)于2011-03-31）.
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