Investigation of flow instability characteristics in a low specific speed centrifugal pump using a modified partially averaged Navier-Stokes model

doi:10.1177/0957650919830188

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-)

	Investigation of flow instability characteristics in a low specific speed centrifugal pump using a modified partially averaged Navier-Stokes model
	Ye, WX; Luo, XW; Huang RF(黄仁芳); Jiang, ZW; Li, XJ; Zhu, ZC
刊名	PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
	2019-11-01
卷号	233 期号:7 页码:834-848
关键词	Centrifugal pump MPANS flow separation rotating stall Lagrangian coherent structures
ISSN号	0957-6509
DOI	10.1177/0957650919830188
通讯作者	Luo, Xianwu(luoxw@tsinghua.edu.cn)
英文摘要	In this study, a modified partially averaged Navier-Stokes (MPANS) model is applied to investigate the flow instability characteristics in a low specific centrifugal pump. In MPANS model, the unresolved-to-total ratio of kinetic energy f(k) is determined according to the local grid size and turbulence length scale. The numerical results by MPANS model are compared with that simulated by SST k-omega model and the available experimental data. It is noted that MPANS model shows better performance for investigating the unstable flow in the current pump under part-load operation conditions. The time-averaged internal flow and flow incidence in the pump impeller depicts that with the decreasing flow coefficient, flow separation develops in the impeller. Owing to the strong separation flow as well as vortex evolution, incidence angle is large and varies remarkably at the entrance of blade-to-blade passage in the pump impeller. The evolution dynamics of rotating stall is further discussed in detail based on vorticity transport equation. During the evolution of rotating stall, the vortex stretching term has an important effect on vorticity transport under the part-load conditions. The analysis of the pressure fluctuations excited by periodic evolution of rotating stall shows that the rotating stall cell propagates along the rotational direction, and identifies the rotating stall frequency (f(stall)), which is much lower than the rotational frequency of the impeller, f(n) (f(stall) = 8.76% f(n)). Finally, two-dimensional Lagrangian coherent structure (LCS) is used to reveal the separation flow in blade-to-blade passages of the pump by monitoring the trajectory of the particles. Both LCS and vortex structure by lambda(2) can clearly demonstrates the passage blockage and flow separation under the part-load operation conditions, depicting that the separation flow occurs at blade suction side and develops from the leading edge to the main passage in the impeller.
分类号	Q3
资助项目	National Key R&D Program of China[2018YFB0606101] ; National Natural Science Foundation of China[51536008] ; Beijing Natural Science Foundation[3182014] ; State Key Laboratory for Hydroscience and Engineering[sklhse-2017-E02] ; Tsinghua National Laboratory for Information Science and Technology ; Science and Technology onWater Jet Propulsion Laboratory[61422230103162223004]
WOS关键词	LAGRANGIAN COHERENT STRUCTURES ; NUMERICAL-SIMULATION ; ROTATING STALL ; CAVITATION ; TURBULENCE
WOS研究方向	Thermodynamics ; Engineering
语种	英语
WOS记录号	WOS:000486019900002
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Beijing Natural Science Foundation ; State Key Laboratory for Hydroscience and Engineering ; Tsinghua National Laboratory for Information Science and Technology ; Science and Technology onWater Jet Propulsion Laboratory
其他责任者	Luo, Xianwu
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/79958]
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	Ye, WX,Luo, XW,Huang RF,et al. Investigation of flow instability characteristics in a low specific speed centrifugal pump using a modified partially averaged Navier-Stokes model[J]. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY,2019,233(7):834-848.
APA	Ye, WX,Luo, XW,黄仁芳,Jiang, ZW,Li, XJ,&Zhu, ZC.(2019).Investigation of flow instability characteristics in a low specific speed centrifugal pump using a modified partially averaged Navier-Stokes model.PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY,233(7),834-848.
MLA	Ye, WX,et al."Investigation of flow instability characteristics in a low specific speed centrifugal pump using a modified partially averaged Navier-Stokes model".PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 233.7(2019):834-848.