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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.4 pt.A: Fluid-Structure Interaction >FLOW EXCITATION OF DIAMETRAL ACOUSTIC MODES OF AXISYMMETRIC CAVITIES
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FLOW EXCITATION OF DIAMETRAL ACOUSTIC MODES OF AXISYMMETRIC CAVITIES

机译：轴对称腔的径向声模流激励

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摘要

Flow-excited resonances of the acoustic diametral modes of a cylindrical pipe housing an axi-symmetric shallow cavity are investigated experimentally. The aeroacoustic response of the cavity-pipe combination is studied up to a Mach number of 0.4 and for several ratios of cavity length to its depth. Although the diametral modes do not have a preferred orientation because of the system axi-symmetry, they are found to be strongly excited by any of the first three instability modes of the cavity shear layer. Intense acoustic pressure levels, up to 170 dB, and wide lock-in resonance ranges have been observed. The acoustic pressure and its phase are measured along the cavity circumference to examine the orientation of the excited diametral modes within the un-preferential domain of the axi-symmetric cavity. Preliminary results suggest that the excited modes are stationary at low flow velocities, but they switch to spinning mode pattern at higher velocities.
机译：实验研究了轴对称的浅腔圆柱管的径向直径模式的流激共振。对腔管组合的空气声响应进行了研究，直到马赫数为0.4，并且腔长度与其深度的比率不同。尽管由于系统轴对称性，径向模式不具有优选的取向，但是发现它们被腔体剪切层的前三个不稳定性模式中的任何一个强烈激发。已经观察到高达170 dB的强声压级和较宽的锁定共振范围。沿着腔体圆周测量声压及其相位，以检查轴对称腔体非优先域内激发的径向模式的方向。初步结果表明，激发模式在低流速下是固定的，但在较高流速下会转换为旋转模式。

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