Numerical study on self-noise characteristics of a flow-induced grid cavity

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (20) : 235-243.

SUN Tiezhi1, XIE Bohan1, MIAO Tiancheng2, JIANG Yichen1, DING Yanyi1

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Abstract

In order to study the characteristics of self noise and near-field radiated noise, a numerical prediction model based on large eddy simulation and acoustic analogy was established. The first-order dominant frequency and the second-order dominant frequency of radiated noise were compared with the experimental results in the literature and the effectiveness of the numerical method is verified. Based on the self noise and radiated noise prediction method of shallow cavity with short opening grid, the effects of grid and two grid types on the flow field characteristics, pressure fluctuation sound pressure level at grid, radiated sound pressure level at 1m away from the center of the cavity and turbulent pressure fluctuation wave number frequency spectrum in the outlet section were studied. The results show that the self noise in the cavity without grid is small, the grid has obvious suppression effect on radiation noise and wavenumber frequency spectrum, and the inclined grid has better suppression effect.
Key words: Large eddy simulation; Flow-induced cavity; Grille; Flow noise; Wavenumber-frequency spectrum

Key words

Large eddy simulation / Flow-induced cavity / Grille / Flow noise / Wavenumber-frequency spectrum

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SUN Tiezhi1, XIE Bohan1, MIAO Tiancheng2, JIANG Yichen1, DING Yanyi1. Numerical study on self-noise characteristics of a flow-induced grid cavity[J]. Journal of Vibration and Shock, 2022, 41(20): 235-243

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