| Instability analysis for a centrifugal pump with straight inlet pipe using partially averaged Navier-Stokes model | |
| Ye WX1; Qian ZD2; Huang RF(黄仁芳)3; Li XJ4; Zhu ZC4; Luo XW1 | |
| Source Publication | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
 |
| 2020-04-21 | |
| Pages | 16 |
| ISSN | 0957-6509 |
| Abstract | The current study numerically investigates the flow instability under several part-load conditions in a centrifugal pump with a straight inlet pipe to explore the underlying relationship between a positive slope phenomenon and internal flow using a partially averaged Navier-Stokes model. The model was validated by comparing the hydraulic performance and averaged flow in the impeller between the numerical results and experimental data of a tested pump. The internal flows in pumps have been intensively investigated based on Batchelor vortex family, Rayleigh-Taylor criterion, entropy generation rate, and energy equation to analyze the flow instability from different aspects. The simulation results using partially averaged Navier-Stokes model are acceptable due to the good agreement with the experimental data for the tested pump. No matter the geometry of the inlet pipe, the pre-swirling flows in the inlet pipe are in the convective instability region. Under the part-load condition of phi = 0.5 phi(bep), the axial vorticity coefficient is affected by the geometry of the inlet pipe. However, under the part-load condition with rotating stall, e.g. phi = 0.78 phi(bep), the flow in the inlet pipe is affected by the unstable flow in the pump impeller. For the pump with a straight inlet pipe, the vortex inside the blade-to-blade passage is in a stable state according to Rayleigh-Taylor criterion under the condition of phi = 0.5 phi(bep). However, the vortex in the blade-to-blade passage is in an unstable state due to centrifugal instability under those operation conditions with rotating stall cells in the impeller, and the dominant oscillations are dependent on the propagation of rotating stall cells. Finally, head loss analysis based on energy equations elucidates that turbulent kinetic energy production term is predominant in the head loss in pump impeller. The present results are helpful for better understanding of the unstable flows and positive slope phenomenon for centrifugal pumps. |
| Keyword | Centrifugal pump inlet pipe positive slope phenomenon PANS model |
| DOI | 10.1177/0957650920919540 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000527975900001 |
| WOS Keyword | NUMERICAL-SIMULATION ; SWIRLING FLOW ; TURBULENCE MODELS ; TURBINE ; VORTEX ; PERFORMANCE ; CAVITATION ; EQUATION ; PANS |
| WOS Research Area | Thermodynamics ; Engineering |
| WOS Subject | Thermodynamics ; Engineering, Mechanical |
| Funding Organization | National Key R&D Program of China[2018YFB0606101] ; National Natural Science Foundation of China[51536008] ; Beijing Natural Science Foundation[3182014] ; Tsinghua National Laboratory for Information Science and Technology |
| Classification | Q3 |
| Ranking | 3 |
| Contributor | Luo, Xianwu |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/84790 |
| Collection | 流固耦合系统力学重点实验室 |
| Affiliation | 1.Tsinghua Univ, Dept Energy & Power Engn, State Key Lab Hydrosci & Engn, Beijing, Peoples R China; 2.Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan, Peoples R China; 3.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing, Peoples R China; 4.Zhejiang Sci Tech Univ, Key Lab Fluid Transmiss Technol Zhejiang Prov, Hangzhou, Peoples R China |
| Recommended Citation GB/T 7714 | Ye WX,Qian ZD,Huang RF,et al. Instability analysis for a centrifugal pump with straight inlet pipe using partially averaged Navier-Stokes model[J]. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY,2020:16.Rp_Au:Luo, Xianwu |
| APA | Ye WX,Qian ZD,黄仁芳,Li XJ,Zhu ZC,&Luo XW.(2020).Instability analysis for a centrifugal pump with straight inlet pipe using partially averaged Navier-Stokes model.PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY,16. |
| MLA | Ye WX,et al."Instability analysis for a centrifugal pump with straight inlet pipe using partially averaged Navier-Stokes model".PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY (2020):16. |
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| Jp2020234.pdf（2510KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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