| Application of Wavenumber-frequency Method for Characteristic Frequency Prediction of Cavity Noise at Subsonic Speeds |
| Lu WS(陆维爽); Wei L; Wang Y; Yang GW(杨国伟) ; Zheng GN(郑冠男); Sun ZX(孙振旭)
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| 通讯作者 | Zheng, G.([email protected])
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| 发表期刊 | JOURNAL OF APPLIED FLUID MECHANICS
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| 2024-02-01
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| 卷号 | 17期号:2页码:370-383 |
| ISSN | 1735-3572
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| 摘要 | Flow-acoustic feedback is one of the main types of noise in a cavity, is caused by the instability of the cavity shear layer and is enhanced through an acoustic -wave feedback mechanism. The flow characteristics of the cavity boundary/shear layer and the characteristic frequencies of the flow-acoustic feedback in the cavities are studied numerically, with aspect ratios ranging from 1/2 to 4/3. The freestream Mach number is equal to 0.11, corresponding to an Re-based cavity length of 2.1x105. Improved Delayed Detached Eddy Simulations combined with Ffowcs Williams-Hawkings acoustic analogy are used to simulate the flow and noise characteristics of the cavities. Auto -correlation analysis of flow field fluctuations is used to establish a link between the boundary/shear layer pressure fluctuations and flow-acoustic feedback noise. For the low aspect ratio cavities investigated in this paper, convection velocities along the shear layer development direction are obtained using wavenumber-frequency analysis. The deeper the cavity, the lower the shear layer flow velocity. Correspondingly, the characteristic frequencies of the narrowband noise generated by the flow-acoustic feedback shift linearly toward the low frequency band as the cavity depth increases. The results of the predicted noise characteristic frequencies obtained using wavenumber-frequency analysis and Rossiter's empirical formula are in agreement with the calculated results. |
| 关键词 | Cavity noise
Flow-acoustic feedback
Wavenumber-frequency analysis
Pressure fluctuation
Flow instability
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| DOI | 10.47176/jafm.17.02.2081
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| 收录类别 | SCI
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| 语种 | 英语
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| WOS记录号 | WOS:001117853800012
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| 关键词[WOS] | EDDY SIMULATION
; OSCILLATIONS
; TURBULENCE
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| WOS研究方向 | Thermodynamics
; Mechanics
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| WOS类目 | Thermodynamics
; Mechanics
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| 资助项目 | National Key Research and Development Program[2022YFB2603400]
; Postdoctoral Fund of Chinese Academy of Sciences[E2XM0404]
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| 项目资助者 | National Key Research and Development Program
; Postdoctoral Fund of Chinese Academy of Sciences
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| 论文分区 | Q4
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| 力学所作者排名 | 1
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| RpAuthor | Zheng, G.
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/94256
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| 专题 | 流固耦合系统力学重点实验室
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推荐引用方式
GB/T 7714 |
Lu WS,Wei L,Wang Y,et al. Application of Wavenumber-frequency Method for Characteristic Frequency Prediction of Cavity Noise at Subsonic Speeds[J]. JOURNAL OF APPLIED FLUID MECHANICS,2024,17,2,:370-383.Rp_Au:Zheng, G.
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| APA |
陆维爽,Wei L,Wang Y,杨国伟,郑冠男,&孙振旭.(2024).Application of Wavenumber-frequency Method for Characteristic Frequency Prediction of Cavity Noise at Subsonic Speeds.JOURNAL OF APPLIED FLUID MECHANICS,17(2),370-383.
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| MLA |
陆维爽,et al."Application of Wavenumber-frequency Method for Characteristic Frequency Prediction of Cavity Noise at Subsonic Speeds".JOURNAL OF APPLIED FLUID MECHANICS 17.2(2024):370-383.
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