Numerical and Experimental Study of Resonant Liners Aeroacoustic Absorption under Grazing Flow
Numerical and Experimental Study of Resonant Liners Aeroacoustic Absorption under Grazing Flow
复制标题
掠流下共振衬垫气动声学吸收的数值与实验研究
DOI：
10.2514/6.2010-3767
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
F. Simon
中科院分区：
文献类型：
--
作者：
J. Roche;F. Vuillot;L. Leylekian;G. Delattre;E. Piot;F. Simon
谐振衬里，如多孔蜂窝板，用于降低进气短舱中的风扇噪声。在先前的论文（Roche等，AIAA论文2009-3146），使用Onera CEDRE CFD代码进行的直接数值模拟（DNS）的结果使我们能够识别粘性壁摩擦和涡对冲作为其主要耗散机制。指出了声压级（SPL）的升高对它们声学性能的影响。在本文中，三维Navier-Stokes和欧拉计算进行，使这些耗散机制的相对效率可以评估。“线性”和“非线性”吸收之间的区别被认为是不太明显，比通常承认。为了估计声波入射的影响，从谐振器开口入口段上的声场局部地定义导纳。最后讨论了马赫数为0.1的定常掠流与声学的耦合问题.通过DNS计算和激光多普勒测速（LDV）实验突出显示了由流动引入的附加非线性。局部导纳的演变进行了研究。
Resonant liners such as perforated honeycomb panels are used to reduce fan noise in the inlet nacelles. In a previous paper (Roche et al ., AIAA paper 2009-3146), the results of Direct Numerical Simulations (DNS), performed with the Onera CEDRE CFD code, enabled us to identify the viscous wall friction and the vortex s hedding as their main dissipation mechanisms. The impact of a rise of Sound Pressure Level (SPL) on their acoustic properties was pointed out. In this paper, 3D Navier-Stokes and Euler computations are performed, so that the relative efficiencies of these dissipation mechanisms can be evaluated. The distinction between “linear” and “nonlinear” absorption is found to be less obvious than commonly admitted. In order to estimate the effect of the sound waves incidence, an admittance is locally defined from the acoustic fie lds over the resonator opening inlet section. The coupling of acoustics with a stationar y 0.1 Mach number grazing air flow is ultimately discussed. The additional nonlinearities introduced by the flow are highlighted with DNS computations and Laser Doppler Velocimetry (LDV) experiments. The evolution of the local admittance is studied as well.