Discrete tones of isolated airfoils
Discrete tones of isolated airfoils
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DOI：
10.1121/1.1914682
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发表时间：
1974-06
影响因子：
2.4
通讯作者：
C. Tam
中科院分区：
文献类型：
--
作者：
C. Tam
最近的实验测量表明，离散的音调是由孤立的翼型在某些操作条件下发出的。参数提出，这些音调是无关的旋涡脱落过程已经建议。有人提出，音调是由空气动力学起源的自激反馈回路产生的。该循环由边界层和尾流中的大尺度不稳定扰动以及反馈声波组成。基于反馈回路模型的定量推导与实验测量结果相比毫不逊色。研究还发现，所提出的模型是一致的观察到的特征与离散音现象。
Recent experimental measurements reveal that discrete tones are emitted by isolated airfoils under certain operating conditions. Arguments are presented that these tones are unrelated to vortex shedding processes as has been suggested. It is proposed that the tones are generated by a self‐excited feedback loop of aerodynamic origin. The loop consists of large‐scale unstable disturbances in the boundary layer and wake flow and the feedback acoustic waves. Quantitative deductions based on the feedback loop model compare favorably with experimental measurements. It is also found that the proposed model is consistent with the observed characteristic features associated with the discrete tone phenomenon.