scholarly journals Investigation on the Flow Field Upstream of a Centrifugal Pump Impeller

2011 ◽  
Vol 4 (1) ◽  
pp. 209-216 ◽  
Author(s):  
Yao Zhang ◽  
Xianwu Luo ◽  
Yunchi Yi ◽  
Baotang Zhuang ◽  
Hongyuan Xu
Keyword(s):  
Flow Field ◽  
Centrifugal Pump ◽  
Pump Impeller ◽  
Centrifugal Pump Impeller

The PIV Measurements on the Flow Fields in an Unshrouded Centrifugal Pump

Volume 1 ◽  
2004 ◽  
Author(s):  
Chao Liu ◽  
Fangping Tang ◽  
Sun Sun ◽  
Li Cheng ◽  
Jiren Zhou
Keyword(s):  
Flow Field ◽  
Centrifugal Pump ◽  
Flow Rate ◽  
Flow Fields ◽  
Pressure Side ◽  
Pump Impeller ◽  
Lower Velocity ◽  
Piv Measurements ◽  
Velocity Zone ◽  
Centrifugal Pump Impeller

PIV was applied to the measurements of flow field in an unshrouded centrifugal pump impeller. Three windows were selected for the measurements. Three operation points of the pump were taken during the measuring. The ratios (Q/QBEP) of the flow rate for measuring are 0.6, 1.0, and 1.4, respectively. The velocity distributions in blade-to-blade passages obtained at different windows give the evidence that the velocity distributions are asymmetric even under the design operation point. A lower velocity zone existed at middle of blade-to-blades passages near the pressure-side of the blade.

scholarly journals Influence of Blade Leading-Edge Shape on Rotating-Stalled Flow Characteristics in a Centrifugal Pump Impeller

2020 ◽  
Vol 10 (16) ◽  
pp. 5635
Author(s):  
Hongying Luo ◽  
Ran Tao ◽  
Jiandong Yang ◽  
Zhengwei Wang
Keyword(s):  
Flow Field ◽  
Centrifugal Pump ◽  
Incidence Angle ◽  
Flow Characteristics ◽  
Leading Edge ◽  
Rotating Stall ◽  
Pump Impeller ◽  
The Impact ◽  
Centrifugal Pump Impeller ◽  
Blade Leading Edge

Rotating stall, which is a common phenomenon in turbomachinery, strongly relates to the flow rate condition. In centrifugal impellers, rotating stall was induced by the incidence angle on blade leading-edge at partial-load. The blade leading-edge shape also influences the rotating stall because of the subtle change of local flow-field. In this study, the influence of blade leading-edge shape on rotating-stalled flow characteristics was studied in a six-blade centrifugal pump impeller. The stall pattern was “alternating”: Three passages were stalled, three passages were well-behaved, and the stalled and well-behaved passages occurred alternately. The stalled flow characteristics can be studied without the interruption of stall cell movement. Four types of blade leading-edge (blunt, sharp, ellipse, and round) were numerically compared based on the initial typical impeller and the numerical–experimental verification. The numerical comparison shows that the leading-edge shape has a strong influence on the stalled flow pattern, velocity, pressure, turbulence kinetic energy, and flow-induced noise inside impellers. The blunt and sharp leading-edge impellers had a similar internal pattern; the ellipse and round leading-edge impellers were also similar in the internal flow-field. Pressure pulsation analysis showed more obvious differences among these impellers. The main frequency and the pulsation peak–peak values were completely different because of the slight leading-edge shape differences. It revealed the impact of leading-edge geometry on the transient flow-field change under the same incidence angle conditions. It also provided reference for influencing or controlling the rotating stall by blade profile design.

Flow in a Centrifugal Pump Impeller at Design and Off-Design Conditions—Part II: Large Eddy Simulations

2003 ◽  
Vol 125 (1) ◽  
pp. 73-83 ◽  
Author(s):  
Rikke K. Byskov ◽  
Christian B. Jacobsen ◽  
Nicholas Pedersen
Keyword(s):  
Flow Field ◽  
Centrifugal Pump ◽  
Turbulence Models ◽  
Navier Stokes ◽  
Pump Impeller ◽  
Design Load ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Subgrid Scales ◽  
Centrifugal Pump Impeller

The flow field in a shrouded six-bladed centrifugal pump impeller has been investigated using large eddy simulation (LES). The effect of the subgrid scales has been modeled through a localized dynamic Smagorinsky model implemented in the commercial CFD code FINE/Turbo. A detailed analysis of the results of LES at design load, Q=Qd, and severe off-design conditions, at quarter-load Q=0.25Qd, is presented. At design load LES reveals a well-behaved flow field with no significant separation. At quarter-load significant differences between adjacent impeller passages are revealed. A steady nonrotating stall phenomenon is observed in the entrance of one passage and a relative eddy develops in the remaining part of the passage. The stall unblocks the adjacent passage which exhibits a flow dominated by rotational effects. Velocities predicted by LES and steady-state Reynolds averaged Navier-Stokes (RANS) simulations based on the Baldwin-Lomax and Chien k-ε turbulence models are compared with experimental data obtained from particle image velocimetry (PIV). The complex two-channel phenomena observed by LES is with satisfactory agreement confirmed by PIV. However, it is found that the two RANS models do not reproduce the stall phenomenon observed at quarterload and are incapable of detecting the differences between the two passages.

Numerical Optimization of a Centrifugal Pump Impeller with Splitter Blades Running in Reverse Mode

2016 ◽  
Vol 10 (4) ◽  
pp. 215 ◽  
Author(s):  
Ioannis Kassanos ◽  
Marios Chrysovergis ◽  
John Anagnostopoulos ◽  
George Charalampopoulos ◽  
Stamelos Rokas ◽  
...  
Keyword(s):  
Centrifugal Pump ◽  
Numerical Optimization ◽  
Pump Impeller ◽  
Reverse Mode ◽  
Centrifugal Pump Impeller

scholarly journals Large Eddy Simulation of Periodic Transient Pressure Fluctuation in a Centrifugal Pump Impeller at Low Flow Rate

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 311
Author(s):  
Renfei Kuang ◽  
Xiaoping Chen ◽  
Zhiming Zhang ◽  
Zuchao Zhu ◽  
Yu Li
Keyword(s):  
Large Eddy Simulation ◽  
Centrifugal Pump ◽  
Flow Rate ◽  
Pressure Fluctuation ◽  
Low Frequency ◽  
Pump Impeller ◽  
Eddy Simulation ◽  
Inlet Flow Rate ◽  
Large Eddy ◽  
Centrifugal Pump Impeller

This paper presents a large eddy simulation of a centrifugal pump impeller during a transient condition. The flow rate is sinusoidal and oscillates between 0.25Qd (Qd indicates design load) and 0.75Qd when the rotating speed is maintained. Research shows that in one period, the inlet flow rate will twice reach 0.5Qd, and among the impeller of one moment is a stall state, but the other is a non-stall state. In the process of flow development, the evolution of low-frequency pressure fluctuation shows an obviously sinusoidal form, whose frequency is insensitive to the monitoring position and equals to that of the flow rate. However, inside the impeller, the phase and amplitude in the stall passages lag behind more and are stronger than that in the non-stall passages. Meanwhile, the strongest region of the high-frequency pressure fluctuation appears in the stall passages at the transient rising stage. The second dominant frequency in stall passages is 2.5 times to that in non-stall passages. In addition, similar to the pressure fluctuation, the evolution of the low-frequency head shows a sinusoidal form, whose phase is lagging behind that by one-third of a period in the inlet flow rate.

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