Analysis of oscillatory pressure data including dynamic stall effects
Analysis of oscillatory pressure data including dynamic stall effects
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分析振荡压力数据，包括动态失速效应
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
F. Carta
中科院分区：
文献类型：
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作者：
F. Carta
通过分析现有的翼型非定常压力数据，对动态失速现象进行了详细的研究。大部分数据是关于不同程度地穿透失速区的正弦振荡，这里的工作集中在与动态失速相关的压力波的弦向传播上。结果发现，这种现象可以用压力波速度来量化，压力波速度始终比自由流速度小得多，并且与频率成正比。研究还发现，即使失速区已经被深穿透，并且在下冲程过程中发生了相当大的动态失速，也会在最小攻角附近发生失速恢复，随后会出现潜在的流动行为，直到失速开始。
The dynamic stall phenomenon was examined in detail by analyzing an existing set of unsteady pressure data obtained on an airfoil oscillating in pitch. Most of the data were for sinusoidal oscillations which penetrated the stall region in varying degrees, and here the effort was concentrated on the chordwise propagation of pressure waves associated with the dynamic stall. It was found that this phenomenon could be quantified in terms of a pressure wave velocity which is consistently much less than free-stream velocity, and which varies directly with frequency. It was also found that even when the stall region has been deeply penetrated and a substantial dynamic stall occurs during the downstroke, stall recovery near minimum incidence will occur, followed by a potential flow behavior up to stall inception.