横流中圆柱管排气动声散射的低频模型
A low frequency model for the aeroacoustic scattering of cylindrical tube rows in cross-flow
摘要：
换热器管排既作为声散射体又作为非稳态热沉，对燃烧系统的热声不稳定性行为有重要影响。因此，通过仔细调整它们的热声特性，换热器具有充当被动控制装置的潜力。在这项工作中，我们专注于（只）声散射行为的换热器管。我们提出了一个现有的声学模型管排和狭缝的比较，后者的模型具有的优势，将频率依赖性。然后，我们提出了一个新的模型，使适应狭缝模型管行。该模型针对实验和线性化纳维-斯托克斯方程（LNSE）预测的透射和反射系数（包括相位信息）进行了验证。模型预测与实验和数值验证非常吻合，特别是对于低频（Strouhal数< 0.5，基于管半径和激励频率），透射系数的平均差异小于2%（反射系数误差略大，因为它们的大小非常接近于零）。
英文摘要：
Heat exchanger tube rows can influence the thermoacoustic instability behaviour of combustion systems since they act as both acoustic scatterers and unsteady heat sinks. Therefore, with careful tuning of their thermoacoustic properties, heat exchangers have the potential to act as passive control devices. In this work, we focus on (only) the acoustic scattering behaviour of heat exchanger tubes. We present a comparison of existing acoustic models for tube rows and slits, models for the latter having the advantage of incorporating frequency dependence. We then propose a new model that enables the adaptation of slit models for tube rows. This model is validated against experiments and Linearised Navier Stokes Equations (LNSE) predictions for the transmission and reflection coefficients, including phase information. The model predictions show very good agreement with the experimental and numerical validations, especially for low frequencies (Strouhal number < 0.5, based on tube radius and excitation frequency), with mean differences less than 2% for the transmission coefficients (the reflection coefficient errors are somewhat larger since their magnitudes are very close to zero).
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