Acoustic emission from interaction of a vortex ring with a sphere
Acoustic emission from interaction of a vortex ring with a sphere
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涡环与球体相互作用的声发射
DOI：
10.1016/0169-5983(88)90092-5
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发表时间：
1988
影响因子：
1.5
通讯作者：
T. Murakami
中科院分区：
文献类型：
--
作者：
T. Minota;T. Kambe;T. Murakami
本文从理论和实验两方面研究了涡环与固球相互作用时所产生的声波。实验中采用了两种涡球排列方式：（A）涡环经过球体，（B）涡环经过球体。涡流运动通过光电传感器系统进行光学检查，并且发射波的压力信号由远场中的1/2英寸麦克风检测。在情况A中，在通过球体之后，涡环的测量直径从其初始直径增加。所观察到的声波主要由偶极发射，并从四极辐射的一些贡献。在情况B中，发射波的特征在于旋转偶极发射，其中偶极轴随着涡旋位置相对于球体的变化而旋转。
Acoustic waves emitted by a vortex ring interacting with a fixed solid sphere are studied experimentally and theoretically. The experiments are carried out for two kindsof vortex-sphere arrangement:(A) a vortex ring passes over the sphere, and (B) a vortex ring passes by the sphere. The vortex motion is examined optically by means of a photosensor system, and the pressure signals of the emitted wave are detected by ½-inch microphones in the far field. In case A, the measured diameter of the vortex ring after passing the sphere increases from its initial diameter. The observed acoustic wave is dominated mainly by a dipole emission, and some contribution from a quadrupole radiation is present. In case B, the emitted wave is characterized by a rotating dipole emission in which the dipole axis rotates as the vortex position changes relative to the sphere.