時系列ステレオPIVによる流体騒音源の解析(安定性・乱流 乱流(1),一般講演)

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  • Analysis of Aerodynamic Sound Source by Time-Resolved Stereoscopic PIV

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Investigation of sound generation mechanism in flow fields is important for reduction of aerodynamic sound. The detailed investigation of sound sources requires velocity measurements with high temporal and spatial resolutions. In this study, sound sources in turbulent mixing layer have been investigated by time-resolved stereoscopic particle image velocimetry (PIV). Powell's sound source and Reynolds stress component of Lighthill's sound source have been evaluated from experimental results and compared with those obtained from the previous direct numerical simulation. It is shown that estimation of Powell's sound source is effective for the analysis of aerodynamic sound source in restricted measurement regions, and that evaluation of Reynolds stress component is useful for the analysis if measurable velocity is limited in two components. In addition, spectral analysis for temporal variations of vorticity and sound sources reveals that frequency of sound generated in mixing layer is dominated by the generation of large-scale vortical structures.

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