Space-time frequency spectra analyses of the unsteady cavitating vortical flows inside a mixed-flow pump | |
Huang RF(黄仁芳)4; Qiu RD(丘润荻)3,4; Wang YW(王一伟)3,4; Luo XW(罗先武)2; Zhang W(张伟)1 | |
刊名 | Ocean Engineering |
2021-10-15 | |
卷号 | 238页码:109758 |
关键词 | Mixed-flow pump Pressure fluctuations Cavitation Wavelet analysis |
DOI | 10.1016/j.oceaneng.2021.109758 |
英文摘要 | The objective of this paper is to investigate the space-time frequency spectra for cavitating flows in a mixed-flow pump by using both fast Fourier transform and wavelet transform. Unsteady cavitating flows in a mixed-flow pump are numerically investigated by using the Reynolds-averaged Navier-Stokes method, which is closured with SST k-ω turbulence model and Zwart cavitation model. The cavitation performance is fairly predicted when compared with available experimental data. There are two stages for unsteady cavitation evolution during one impeller rotating cycle, including the cavity growth stage and diminution stage. The cavitation in the impeller is characterized by the spatial non-uniform distribution since a high-pressure region presents at the impeller inlet plane. The pressure amplitude decreases when the cavitation becomes severer at a smaller operating velocity. Besides, the dominant frequency in the impeller is the impeller rotating frequency (fn), i.e. the cavity evolution frequency. Due to the rotor-stator interaction from the six-blade impeller, there is a dominant long-term frequency of 6fn in the intake duct and the diffuser inlet. Furthermore, a broadband low-frequency around 1.5fn exhibits near the diffuser exit, and the 1.5fn amplitude varies over time corresponding to different corner-vortex dynamics. Therefore, wavelet analysis is a more favorable and practical method to obtain time-dependent frequency information for unsteady cavitating flows. |
分类号 | 一类 |
语种 | 英语 |
WOS记录号 | WOS:000696669500002 |
其他责任者 | 王一伟 |
内容类型 | 期刊论文 |
源URL | [http://dspace.imech.ac.cn/handle/311007/87278] |
专题 | 力学研究所_流固耦合系统力学重点实验室(2012-) |
通讯作者 | Wang YW(王一伟) |
作者单位 | 1.Science and Technology on Water Jet Propulsion Laboratory, Shanghai, 200011, China 2.State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China 3.School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, China 4.Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China |
推荐引用方式 GB/T 7714 | Huang RF,Qiu RD,Wang YW,et al. Space-time frequency spectra analyses of the unsteady cavitating vortical flows inside a mixed-flow pump[J]. Ocean Engineering,2021,238:109758. |
APA | Huang RF,Qiu RD,Wang YW,Luo XW,&Zhang W.(2021).Space-time frequency spectra analyses of the unsteady cavitating vortical flows inside a mixed-flow pump.Ocean Engineering,238,109758. |
MLA | Huang RF,et al."Space-time frequency spectra analyses of the unsteady cavitating vortical flows inside a mixed-flow pump".Ocean Engineering 238(2021):109758. |
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