Application of Wavenumber-frequency Method for Characteristic Frequency Prediction of Cavity Noise at Subsonic Speeds

doi:10.47176/jafm.17.02.2081

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	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)
刊名	JOURNAL OF APPLIED FLUID MECHANICS
	2024-02-01
卷号	17 期号:2 页码:370-383
关键词	Cavity noise Flow-acoustic feedback Wavenumber-frequency analysis Pressure fluctuation Flow instability
ISSN号	1735-3572
DOI	10.47176/jafm.17.02.2081
通讯作者	Zheng, G.(zhengguannan@imech.ac.cn)
英文摘要	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.
分类号	Q4
资助项目	National Key Research and Development Program[2022YFB2603400] ; Postdoctoral Fund of Chinese Academy of Sciences[E2XM0404]
WOS关键词	EDDY SIMULATION ; OSCILLATIONS ; TURBULENCE
WOS研究方向	Thermodynamics ; Mechanics
语种	英语
WOS记录号	WOS:001117853800012
资助机构	National Key Research and Development Program ; Postdoctoral Fund of Chinese Academy of Sciences
其他责任者	Zheng, G.
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/94255]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
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.
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.
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.