Effect of acoustic excitation on stalled flows over an airfoil
Effect of acoustic excitation on stalled flows over an airfoil
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DOI：
10.2514/3.11092
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发表时间：
1990-10
期刊：
影响因子：
2.5
通讯作者：
K. Zaman
中科院分区：
文献类型：
--
作者：
K. Zaman
声学激励对后失速气流的影响在翼型，即，流动是完全分离的，从前缘附近，进行了研究。尽管流体可能仍然保持完全分离，但激发会导致重新附着的趋势，并伴随着升力的增加和阻力的减少。随着激发振幅的增加，该效应变得更加明显，但会转变为远低于分离剪切层线性无粘不稳定性所期望的斯特劳哈尔数
The effect of acoustic excitation on poststalled flows over an airfoil, i.e., flows that are fully separated from near the leading edge, is investigated. The excitation results in a tendency toward reattachment, which is accompanied by an increased lift and reduced drag, although the flow may still remain fully separated. With increasing excitation amplitude, the effect becomes more pronounced but shifts to a Strouhal number that is much lower than that expected from linear, inviscid instability of the separated shear layer