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首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >IMPACT OF QUARTER WAVE TUBE ARRANGEMENT ON DAMPING OF AZIMUTHAL MODES
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IMPACT OF QUARTER WAVE TUBE ARRANGEMENT ON DAMPING OF AZIMUTHAL MODES

机译：正交管布置对方位模态阻尼的影响

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摘要

The impact of quarter wave tube (QWT) arrangements in terms of axial location, circumferential distribution and number of cavities on damping of azimuthal modes is investigated both experimentally and numerically in an atmospheric annular test rig under isothermal conditions. Well-established measurement techniques are applied to characterize the damping potential for azimuthal modes of different quarter wave tube (QWT) arrangements. For additional insight into the considered configurations eigenfrequency studies are conducted using linearized Euler equations (LEE). Measured boundary conditions are used for inlet and outlet. The reflection coefficient of a single quarter wave tube (QWT) is measured on an impedance rig using longitudinal wave excitation. It is shown that this reflection coefficient can be used for the eigenfrequency analysis of the annular rig in which the QWT is mounted in radial direction. The effects of different quarter wave tube configurations on the spatial mode shape of the first azimuthal mode and the corresponding change in modal dynamics are analyzed. This provides guidance for the circumferential and axial arrangement of damping devices to most effectively attenuate an annular acoustic system. It is illustrated that the complete acoustic system including the resonators has to be considered to properly dimension the acoustic characteristics of a damping device.
机译：在等温条件下，在大气环形试验台上，通过实验和数值研究了四分之一波长管（QWT）布置在轴向位置，周向分布和腔数方面对方位模态阻尼的影响。应用成熟的测量技术来表征不同四分之一波长管（QWT）布置的方位模的阻尼电势。为了进一步了解所考虑的配置，使用线性欧拉方程（LEE）进行了本征频率研究。测得的边界条件用于入口和出口。单四分之一波长管（QWT）的反射系数是使用纵向波激励在阻抗装置上测量的。结果表明，该反射系数可用于在径向安装QWT的环形钻机的本征频率分析。分析了不同的四分之一波长管配置对第一方位模态的空间模态形状以及模态动力学的相应变化的影响。这为阻尼装置的周向和轴向布置提供了指导，以最有效地衰减环形声学系统。示出了，必须考虑包括谐振器的整个声学系统以适当地确定阻尼装置的声学特性的尺寸。

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