Acoustic investigation of a hollow chamber in turbulent flow

紊流中的空心腔室经常被用于工业用途。为了实现设计目标（例如，降低噪音），经常在昂贵的实验运行中测试各种配置。到目前为止，人们对湍流和声学之间的基本相互作用还缺乏了解。我们不知道有任何模型考虑到实际的几何形状（边界层的有限厚度）和非线性（例如，边界层和腔室的共振）。然而，这些量的影响是已知的。这个为期9个月的项目的目的是将现有的声学参考模型与已经进行的“直接数值模拟”的结果进行比较。本文将指出这些参考模型的优缺点。最后，我们正在努力结合/增强参考模型。新组合/增强的模型允许对湍流中空心腔室的声学特性进行更一般的预测，并节省设计过程中的资源。

Hollow chambers in turbulent flow have frequently been surveyed for industrial use. Often various configurations are tested in expensive experimental runs in order to fulfil design objectives (e.g., noise reduction). So far there is a lack of understanding of the basic interactions between turbulence and acoustics. We are not aware of any model which takes into account a realistic geometry (finite thickness of the boundary layer) and non-linearity (e.g., resonances of boundary layer and chamber). Nevertheless, the influence of these quantities is known.The aim of this nine-month project is to compare existing acoustic reference-models with the results of an already conducted 'Direct Numerical Simulation'. The pros and cons of these reference-models will be pointed out. Finally, we are striving to combine / enhance the reference-models. The newly combined / enhanced model allows a more general prediction of the acoustic properties of a hollow chamber in turbulent flow and saves resources of the design process.