流激格栅孔腔自噪声特性数值计算研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (20) : 235-243.

论文

流激格栅孔腔自噪声特性数值计算研究

孙铁志1，谢勃汉1，苗天丞2，姜宜辰1，丁言义1

作者信息 +

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

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

Author information +

文章历史 +

摘要

当水流流经水下航行体表面开孔时会产生随机的压力脉动并辐射噪声，为了研究流激水下航行体表面开孔自噪声特性和近场辐射噪声特性，基于大涡模拟和声学类比相结合的数值计算方法建立了数值预报模型，通过与文献中试验对比辐射噪声的一阶主频和二阶主频，验证了数值计算方法的有效性。基于建立的流激带格栅短开孔浅腔自噪声及辐射噪声预报方法，开展了有无格栅以及两种格栅类型对孔腔内流场特性、格栅处压力脉动声压级、距孔腔中心1m处辐射噪声和去流段湍流压力脉动波数-频率谱的影响研究。结果分析表明，在本文的研究工况中无格栅孔腔内自噪声较小，格栅对辐射噪声有明显抑制效果，而倾斜格栅的抑制效果较好。
关键词：大涡模拟；流激孔腔；格栅；流噪声；波数-频率谱

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

导出引用

孙铁志1，谢勃汉1，苗天丞2，姜宜辰1，丁言义1. 流激格栅孔腔自噪声特性数值计算研究[J]. 振动与冲击, 2022, 41(20): 235-243

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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