Study on a horizontal axial flow pump during runaway process with bidirectional operating conditions

被引:20
作者
Kan, Kan [1 ,2 ,3 ]
Zhang, Qingying [1 ]
Xu, Zhe [2 ]
Chen, Huixiang [2 ,3 ,4 ]
Zheng, Yuan [1 ,2 ]
Zhou, Daqing [1 ,2 ]
Binama, Maxima [2 ]
机构
[1] Hohai Univ, Coll Energy & Elect Engn, Nanjing 211100, Peoples R China
[2] Hohai Univ, Coll Water Conservancy & Hydropower Engn, Nanjing 210098, Peoples R China
[3] Hohai Univ, Nantong Ocean & Coastal Engn Res Inst, Nanjing, Peoples R China
[4] Hohai Univ, Coll Agr Sci & Engn, Nanjing 210098, Peoples R China
基金
中国国家自然科学基金;
关键词
EXTENSION TUBULAR PUMP; TRANSIENT CHARACTERISTICS; FRANCIS TURBINE; SIMULATION; UNIT;
D O I
10.1038/s41598-021-01250-1
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The ultra-low head pump stations often have bidirectional demand of water delivery, so there is a risk of runaway accident occurring in both conditions. To analyze the difference of the runaway process under forward runaway condition (FRC) and backward runaway condition (BRC), the whole flow system of a horizontal axial flow pump is considered. The Shear-Stress Transport (SST) k-omega model is adopted and the volume of fluid (VOF) model is applied to simulate the water surface in the reservoirs. Meanwhile, the torque balance equation is introduced to obtain the real time rotational speed, then the bidirectional runaway process of the pump with the same head is simulated. In addition, the vortex transport equation and swirl number are proposed to reveal the flow characteristics during the runaway process. The results show that the runaway process can be divided into five stages: the drop, braking, rising, convergence and runaway stages, according to the changing law of torque curve. In the rising stage, the pressure difference on the blade surface continues to increase, which contributes to the abnormal torque increase. In this stage, the flow hits the pressure surface (PS) at a faster speed enlarging the pressure on PS, and the flow separation takes place on the suction surface (SS) weakening the pressure on SS. During the convergence and runaway stage, the pulsation amplitude of torque and axial force under FRC is obviously larger than those under BRC. This is because the rotation frequency of the vortex rope is the same as main pressure fluctuation frequency in impeller under FRC, which enhances the pulsation amplitude. Whereas the vortices are broken due to the inhibitive effect from guide vanes under BRC.
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页数:21
相关论文
共 36 条
[1]   Simulation of transient flow in pipeline systems due to load rejection and load acceptance by hydroelectric power plants [J].
Afshar, M. H. ;
Rohani, M. ;
Taheri, R. .
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 2010, 52 (01) :103-115
[2]   Water hammer simulation by implicit method of characteristic [J].
Afshar, M. H. ;
Rohani, M. .
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING, 2008, 85 (12) :851-859
[3]  
[Anonymous], 2009, INT J FLUID MACH SYS, DOI [10.5293/IJFMS.2009.2.4.324, DOI 10.5293/IJFMS.2009.2.4.324]
[4]   Hybrid analytical framework for regional agricultural water resource utilization and efficiency evaluation [J].
Cao, Xinchun ;
Zeng, Wen ;
Wu, Mengyang ;
Guo, Xiangping ;
Wang, Weiguang .
AGRICULTURAL WATER MANAGEMENT, 2020, 231
[5]   Transient behavior of a centrifugal pump during starting period [J].
Chalghoum, Issa ;
Elaoud, Sami ;
Akrout, Mohsen ;
Taieb, Ezzeddine Hadj .
APPLIED ACOUSTICS, 2016, 109 :82-89
[6]   On the hydrodynamics of hydraulic machinery and flow control [J].
Chen, Hong-xun ;
Ma, Zheng ;
Zhang, Wei ;
Zhu, Bing ;
Zhang, Rui ;
Wei, Qun ;
Zhang, Zheng-chuan ;
Liu, Chao ;
He, Jian-wu .
JOURNAL OF HYDRODYNAMICS, 2017, 29 (05) :782-789
[7]   Influence of pump starting times on transient flows in pipes [J].
Elaoud, Sami ;
Hadj-Taieb, Ezzeddine .
NUCLEAR ENGINEERING AND DESIGN, 2011, 241 (09) :3624-3631
[8]   Numerical investigation on characteristics of transient process in centrifugal pumps during power failure [J].
Feng, Jianjun ;
Ge, Zhenguo ;
Zhang, Yu ;
Zhu, Guojun ;
Wu, Guangkuan ;
Lu, Jinling ;
Luo, Xingqi .
RENEWABLE ENERGY, 2021, 170 :267-276
[9]   Numerical analysis of transient characteristics of a bulb hydraulic turbine during runaway transient process [J].
Feng, Jianjun ;
Li, Wenfeng ;
Luo, Xingqi ;
Zhu, Guojun .
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING, 2019, 233 (04) :813-823
[10]   Validation of simulation strategies for the flow in a model propeller turbine during a runaway event [J].
Fortin, M. ;
Houde, S. ;
Deschenes, C. .
27TH IAHR SYMPOSIUM ON HYDRAULIC MACHINERY AND SYSTEMS (IAHR 2014), PTS 1-7, 2014, 22