FLOW-INDUCED NOISE ON A BLUFF BODY
FLOW-INDUCED NOISE ON A BLUFF BODY
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DOI：
10.1121/1.412073
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发表时间：
1995-02
影响因子：
2.4
通讯作者：
J. F. McEachern;G. Lauchle
中科院分区：
文献类型：
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作者：
J. F. McEachern;G. Lauchle
在基于直径的雷诺数4×103至1.8×104范围内，在横向流动中配置为三维圆柱体的惯性型压力梯度水听器上进行了流动噪声测量。这些测量是在4.2到50赫兹的频率下进行的，因为这些尸体被拖在一个静止的水体中。系统地改变了气缸的几何形状，以影响流动噪声水平，并有助于识别主要的流动噪声源。圆柱体宽高比在0.5到2.5之间变化，通过解除半径为0.0315D到0.5D的90°边缘来改变端盖的几何形状，其中D是圆柱体的直径。这些（和其他流动可视化）实验的数据表明，在端帽和圆柱体之间的角落存在半径，导致端帽上分离的流动显著减少，并且流动噪声水平相应降低。流动噪声水平也随体面减小而减小。
Flow noise measurements were made on inertial type pressure gradient hydrophones, configured as three‐dimensional cylinders in cross flow, over a diameter‐based Reynolds number range of 4×103 to 1.8×104. The measurements were made at frequencies from 4.2 to 50 Hz as the bodies were towed in a quiescent body of water. Systematic changes were made in the cylinder geometry as to affect the flow noise level and to aid in the identification of dominant flow noise sources. The cylinder aspect ratio was varied from 0.5 to 2.5, and the endcap geometry was altered by relieving the 90° edge with radii that ranged from 0.0315D to 0.5D, where D is the diameter of the cylinder. The data from these (and other flow visualization) experiments shows that the presence of a radius at the corner between the endcap and the cylinder results in a significant reduction of the separated flow over the endcap, and that the flow noise levels decrease accordingly. The flow noise levels are also observed to decrease as the body aspect...