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首页> 外文期刊>International Journal of Aerodynamics >Experimental correlations between aerodynamics, wall-pressure fluctuations, and noise transmission through a window downstream of a step in a flow
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Experimental correlations between aerodynamics, wall-pressure fluctuations, and noise transmission through a window downstream of a step in a flow

机译：空气动力学，壁面压力波动和通过气流台阶下游的窗户传播的噪声之间的实验相关性

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摘要

We investigate the effects of vortex dynamics and unsteady flow separation downstream of a forward facing step on the inside noise radiation through a glass window in a low-speed turbulent flow. Investigations have been performed in an anechoic wind tunnel and include simultaneous measurements between wall and acoustic pressures and the velocity field. The objective is to identify the aerodynamic sources and analyse the link between turbulence and acoustic emission. Spectral and coherence analysis of the fluctuating pressures are used to characterise the temporal scale of the unsteady aerodynamics. Spatial correlation applied to synchronous wall-pressure/velocity measurements successfully catches hydrodynamic excitation mechanism and highlights the strong contribution of vortex shedding to the wall pressure fluctuations. As an attempt to link aerodynamics and acoustic emission, correlation analysis is also applied to acoustic pressure signals with more mixed results. This might be explained by a loss of spatial information in the acoustic measurement.
机译：我们研究了在低速湍流中通过玻璃窗的内部噪声辐射对前向步骤下游的涡旋动力学和非恒定流分离的影响。已经在消声风洞中进行了调查，其中包括同时测量壁压和声压以及速度场。目的是识别空气动力源并分析湍流和声发射之间的联系。脉动压力的频谱和相干分析用于表征非定常空气动力学的时间尺度。应用于同步壁压/速度测量的空间相关性成功地抓住了流体动力激励机制，并突显了涡旋脱落对壁压波动的强烈贡献。为了将空气动力学和声发射联系起来，相关分析也被应用于声压信号，其结果更加混合。这可以通过声学测量中空间信息的丢失来解释。

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