On the acoustic signature of tandem airfoils: The sound of an elastic airfoil in the wake of a vortex generator
On the acoustic signature of tandem airfoils: The sound of an elastic airfoil in the wake of a vortex generator
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DOI：
10.1063/1.4958661
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发表时间：
2016-07
影响因子：
4.6
通讯作者：
A. Manela
中科院分区：
文献类型：
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作者：
A. Manela
研究了均匀高雷诺数流场中声学紧凑串列翼型的声学特征。上游翼型被认为是刚性的，并在其前缘处以小振幅谐波俯仰运动致动。下游翼型被视为被动和弹性的，其运动由上游翼型的涡列激励所强迫。非线性近场描述是通过势薄翼型理论获得的。然后将其作为源项应用到Powell-Howe声学类比中，以产生系统的远场偶极子辐射。为了评估下游翼型弹性的影响，将结果与非弹性设置的对应计算进行比较，其中下游翼型是刚性和静止的。根据翼型之间的分离距离，翼型运动和翼型尾流动力学在同相（同步）和反相行为之间转变。因此，下游翼型的弹性可以起到放大或抑制气流的作用。
The acoustic signature of an acoustically compact tandem airfoil setup in uniform high-Reynolds number flow is investigated. The upstream airfoil is considered rigid and is actuated at its leading edge with small-amplitude harmonic pitching motion. The downstream airfoil is taken passive and elastic, with its motion forced by the vortex-street excitation of the upstream airfoil. The non-linear near-field description is obtained via potential thin-airfoil theory. It is then applied as a source term into the Powell-Howe acoustic analogy to yield the far-field dipole radiation of the system. To assess the effect of downstream-airfoil elasticity, results are compared with counterpart calculations for a non-elastic setup, where the downstream airfoil is rigid and stationary. Depending on the separation distance between airfoils, airfoil-motion and airfoil-wake dynamics shift between in-phase (synchronized) and counter-phase behaviors. Consequently, downstream airfoil elasticity may act to amplify or suppress s...