## 摘要

The presence of a cavity changes the mean and fluctuating pressure distributions. Similarities are observed between a cylindrical cavity and a rectangular cavity for a compressible flow. The type of cavity flow field depends on the diameter-to-depth ratio and the length-to-depth ratio. The feedback loop is responsible for the generation of discrete acoustic tones. In this study, the self-sustained oscillation for a compressible cylindrical cavity flow was investigated experimentally. For open-type cavities, the power spectra show that the strength of resonance depends on the diameter-to-depth ratio (4.43–43.0) and the incoming boundary layer thickness-to-depth ratio (0.72–7.0). The effective streamwise length is used as the characteristic length to estimate the Strouhal number. At higher modes, there is a large deviation from Rossiter's formula for rectangular cavities. The gradient-based searching method was used to evaluate the values of the empirical parameters. Less phase lag and a lower convection velocity are observed.

原文 | English |
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頁（從 - 到） | 1294-1299 |

頁數 | 6 |

期刊 | Chinese Journal of Aeronautics |

卷 | 30 |

發行號 | 4 |

DOIs | |

出版狀態 | Published - 2017 八月 |

## All Science Journal Classification (ASJC) codes

- Aerospace Engineering
- Mechanical Engineering