Abstract Porous materials with high flow-resistivity could provide significant sound absorption. However, the pressure drop across such materials may be unacceptable for applications involving mean flow, such as in heat sinks. The goal of this study is to design a foam macro-structure that minimizes pressure drop while retaining optimal acoustic performance. Corrugated macro-geometries have been studied previously for heat sinking applications with a focus on increasing heat transfer coefficient and reducing pumping power. In this study, a corrugated macro-geometry is proposed as a potential shape for flow-acoustic applications. Foam macro-structures are fabricated in the proposed corrugated shape and compared against the well-known wedge and block shapes for combined flow-acoustic performance. Both stochastic and periodic foams are used for this study. The acoustic performance of these foam samples is characterized by measuring the absorption coefficient and transmission loss. The flow performance is characterized by measuring the pressure drop across these foam samples using a custom-designed flow resistivity setup. Numerical studies are also performed to predict the transmission loss, absorption coefficient, and pressure drop. The experimental results are in close agreement with numerical predictions. Evaluation of the tested foam samples by combined flow-acoustic indices reveal that corrugated macro-geometry is significantly better for acoustic absorption in applications involving mean flow. Furthermore, a parametric study is performed on the geometrical attributes of the corrugated macro-structure, which gives a guideline to design an optimal geometry.

中文翻译：

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高吸压低压降组合泡沫宏观结构设计与参数研究

摘要 具有高流动阻力的多孔材料可以提供显着的吸声效果。然而，对于涉及平均流的应用，例如在散热器中，跨过这些材料的压降可能是不可接受的。本研究的目标是设计一种泡沫宏观结构，在保持最佳声学性能的同时最大限度地减少压降。先前已经研究了波纹宏观几何形状的散热应用，重点是提高传热系数和降低泵送功率。在这项研究中，提出了波纹宏观几何形状作为流动声学应用的潜在形状。泡沫宏观结构以建议的波纹形状制造，并与众所周知的楔形和块形形状进行比较，以实现组合流动声学性能。本研究使用随机泡沫和周期性泡沫。这些泡沫样品的声学性能通过测量吸收系数和传输损耗来表征。流动性能的特点是使用定制设计的流动电阻率设置测量这些泡沫​​样品的压降。还进行了数值研究以预测传输损耗、吸收系数和压降。实验结果与数值预测非常吻合。通过组合流动声学指数对测试泡沫样品的评估表明，波纹宏观几何形状对于涉及平均流动的应用中的吸声效果明显更好。此外，对波纹宏观结构的几何属性进行了参数研究，