Experimental Investigation of the Trailing Edge Noise Mechanism
Experimental Investigation of the Trailing Edge Noise Mechanism
复制标题
后缘噪声机理的实验研究
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
C. Tam
中科院分区：
文献类型：
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作者：
J. C. Yu;C. Tam
本文对平板上紊流附壁射流与尖后缘相互作用产生噪声的物理机制进行了实验研究。使用纵横比为10的矩形喷嘴来提供壁射流。测量包括远场噪声，表面压力波动，湍流速度波动，以及这些量之间的两点时空互相关。结果表明，强的生成机制是对流的大尺度准有序扰动的上自由剪切层的壁射流与后缘的相互作用。这种相互作用还在尾缘尾迹中激发出大尺度的强涡运动。声场的主要部分是高度相干的，并且在后缘上相位相反。
An experimental investigation has been conducted to understand the physical mechanism of noise generation from a turbulent wall jet discharging over a flat plate and interacting with its sharp trailing edge. An aspect ratio 10 rectangular nozzle was used to provide the wall jet. Measurements made consist of farfield noise, surface pressure fluctuations, turbulent velocity fluctuations, and two-point space-time cross-correlations among these quantities. Results are presented which suggest strongly that the generation mechanism is the interaction of the convecting large scale quasi-orderly disturbance in the upper free shear layer of the wall jet with the trailing edge. The interaction also excites large scale strong vortical motion in the trailing edge wake. The dominant part of the sound field is highly coherent and in phase opposition across the trailing edge.