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Experimental study of vortex-structure interaction noise radiated from rod-airfoil configurations

机译:杆翼型结构辐射出的旋涡-结构相互作用噪声的实验研究

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Vortex-structure interaction noise radiated from an airfoil embedded in the wake of a rod is investigated experimentally in an anechoic wind tunnel by means of a phased microphone array for acoustic tests and particle image velocimetry (PIV) for the flow field measurements. The rod-airfoil configuration is varied by changing the rod diameter (D), adjusting the cross-stream position (Y) of the rod and the streamwise gap (L) between the rod and the airfoil leading edge. Two noise control concepts, including "air blowing" on the upstream rod and a soft-vane leading edge on the airfoil, are applied to control the vortex-structure interaction noise. The motivation behind this study is to investigate the effects of the three parameters on the characteristics of the radiated noise and then explore the influences of the noise control concepts. Both the vortex-structure interaction noise and the rod vortex shedding tonal noise are analysed. The acoustic test results show that both the position and magnitude of the dominant noise source of the rod-airfoil model are highly dependent on the parameters considered. In the case where the vortex-structure interaction noise is dominant, the application of the air blowing and the soft vane can effectively attenuate the interaction noise. Flow field measurements suggest that the intensity of the vortex-structure interaction and the flow impingement on the airfoil leading edge are suppressed by the control methods, giving a reduction in noise. (C) 2014 Elsevier Ltd. All rights reserved.
机译:在无回声风洞中,通过相控传声器阵列进行声学测试,并通过粒子图像测速仪(PIV)进行流场测量,对埋在杆尾中的翼型辐射出的涡旋结构相互作用噪声进行了实验研究。通过改变杆直径(D),调节杆的横流位置(Y)以及杆与翼型前缘之间的沿流方向的间隙(L),可以改变杆的翼型配置。两种噪声控制概念,包括上游杆上的“吹气”和翼型上的软叶片前缘,被用来控制涡旋-结构相互作用的噪声。这项研究的目的是研究这三个参数对辐射噪声特性的影响,然后探究噪声控制概念的影响。分析了旋涡-结构相互作用噪声和杆旋涡脱落声调噪声。声学测试结果表明,杆型模型的主要噪声源的位置和大小都高度取决于所考虑的参数。在涡旋-结构相互作用噪声占主导的情况下,吹气和软叶片的应用可以有效地减弱相互作用噪声。流场测量表明,通过控制方法可以抑制涡旋-结构相互作用的强度以及对翼型前缘的流冲击,从而降低了噪声。 (C)2014 Elsevier Ltd.保留所有权利。

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