Effect of the runner sealing parameters and operating regime on the radial force on the rotor of a mixed-flow pump-turbine

1994 ◽  
Vol 28 (12) ◽  
pp. 726-730 ◽  
Author(s):  
V. A. Umov ◽  
L. A. Cherepovitsyn
Keyword(s):  
Operating Regime ◽  
Radial Force ◽  
Mixed Flow ◽  
Pump Turbine ◽  
Flow Pump

scholarly journals Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

Energies ◽  
2017 ◽  
Vol 10 (1) ◽  
pp. 57 ◽  
Author(s):  
Yue Hao ◽  
Lei Tan ◽  
Yabin Liu ◽  
Yun Xu ◽  
Jinsong Zhang ◽  
...  
Keyword(s):  
Energy Performance ◽  
Radial Force ◽  
Mixed Flow ◽  
Flow Pump

Performance and Radial Loading of a Mixed-Flow Pump Under Non-Uniform Suction Flow

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
B. P. M. van Esch
Keyword(s):  
Velocity Profile ◽  
Radial Force ◽  
Rotor System ◽  
Flow Profile ◽  
Centrifugal Pumps ◽  
Mixed Flow ◽  
Pipe Bend ◽  
Suction Velocity ◽  
Suction Flow ◽  
Flow Pump

Many centrifugal pumps have a suction velocity profile, which is nonuniform, either by design like in double-suction pumps, sump pumps, and in-line pumps, or as a result of an installation close to an upstream disturbance like a pipe bend. This paper presents an experimental study on the effect of a nonuniform suction velocity profile on performance of a mixed-flow pump and hydrodynamic forces on the impeller. In the experiments, a newly designed dynamometer is used, equipped with six full Wheatstone bridges of strain gauges to measure the six generalized force components. It is placed in between the shaft of the pump and the impeller and corotates with the rotor system. A high accuracy is obtained due to the orthogonality of bridge positioning and the signal conditioning electronics embedded within the dynamometer. The suction flow distribution to the pump is adapted using a pipe bundle situated in the suction pipe. Results of measurements show the influence of the suction flow profile and blade interaction on pump performance and forces. Among the most important observations are a backward whirling motion of the rotor system and a considerable steady radial force.

scholarly journals Unsteady Hydraulic Force in Mixed-Flow Pump with Volute Casing.

1997 ◽  
Vol 63 (614) ◽  
pp. 3330-3337 ◽  
Author(s):  
Hayato SHIMIZU ◽  
Chisachi KATO ◽  
Tomoyoshi OKAMURA ◽  
Takehiko KOMATSU
Keyword(s):  
Mixed Flow ◽  
Hydraulic Force ◽  
Flow Pump

Effect of Blade Thickness on Rotating Stall of Mixed-Flow Pump Using Entropy Generation Analysis

Energy ◽  
2021 ◽  
pp. 121381
Author(s):  
Leilei Ji ◽  
Wei Li ◽  
Weidong Shi ◽  
Fei Tian ◽  
Ramesh Agarwal
Keyword(s):  
Entropy Generation ◽  
Rotating Stall ◽  
Mixed Flow ◽  
Blade Thickness ◽  
Flow Pump

DEVELOPMENT OF A MINIATURE MIXED-FLOW PUMP TO REPLACE TOTAL HEART FUNCTION

ASAIO Journal ◽  
1996 ◽  
Vol 42 (2) ◽  
pp. 8
Author(s):  
H. Anai ◽  
K. Araki ◽  
M. Oshikawa ◽  
T. Hadama ◽  
Y. Uchida
Keyword(s):  
Heart Function ◽  
Mixed Flow ◽  
Flow Pump

Effect of Tip Clearance on Suction Performance at Different Flow Rates in a Mixed Flow Pump

2014 ◽  
Author(s):  
Yo Han Jung ◽  
Young Uk Min ◽  
Jin Young Kim
Keyword(s):  
Performance Test ◽  
Stokes Equations ◽  
Flow Characteristics ◽  
Tip Clearance ◽  
Low Flow ◽  
Tip Leakage Flow ◽  
Mixed Flow ◽  
Flow Rates ◽  
Suction Performance ◽  
Flow Pump

This paper presents a numerical investigation of the effect of tip clearance on the suction performance and flow characteristics at different flow rates in a vertical mixed-flow pump. Numerical analyses were carried out by solving three-dimensional Reynolds-averaged Navier-Stokes equations. Steady computations were performed for three different tip clearances under noncavitating and cavitating conditions at design and off-design conditions. The pump performance test was performed for the mixed-flow pump and numerical results were validated by comparing the experimental data for a system characterized by the original tip clearance. It was shown that for large tip clearance, the head breakdown occurred earlier at the design and high flow rates. However, the head breakdown was quite delayed at low flow rate. This resulted from the cavitation structure caused by the tip leakage flow at different flow rates.

Influence of different blade numbers on the performance of “saddle zone” in a mixed flow pump

2021 ◽  
pp. 095765092110460
Author(s):  
Leilei Ji ◽  
Wei Li ◽  
Weidong Shi ◽  
Fei Tian ◽  
Shuo Li ◽  
...  
Keyword(s):  
Flow Field ◽  
Leading Edge ◽  
Leakage Flow ◽  
Tip Leakage Flow ◽  
Mixed Flow ◽  
Impeller Blade ◽  
Flow Angle ◽  
Tip Leakage ◽  
Vorticity Transport ◽  
Flow Pump

In order to study the effect of different numbers of impeller blades on the performance of mixed-flow pump “saddle zone”, the external characteristic test and numerical simulation of mixed-flow pumps with three different impeller blade numbers were carried out. Based on high-precision numerical prediction, the internal flow field and tip leakage flow field of mixed flow pump under design conditions and stall conditions are investigated. By studying the vorticity transport in the stall flow field, the specific location of the high loss area inside the mixed flow pump impeller with different numbers of blades is located. The research results show that the increase in the number of impeller blades improve the pump head and efficiency under design conditions. Compared to the 4-blade impeller, the head and efficiency of the 5-blade impeller are increased by 5.4% and 21.9% respectively. However, the increase in the number of blades also leads to the widening of the “saddle area” of the mixed-flow pump, which leads to the early occurrence of stall and increases the instability of the mixed-flow pump. As the mixed-flow pump enters the stall condition, the inlet of the mixed-flow pump has a spiral swirl structure near the end wall for different blade numbers, but the depth and range of the swirling flow are different due to the change in the number of blades. At the same time, the change in the number of blades also makes the flow angle at 75% span change significantly, but the flow angle at 95% span is not much different because the tip leakage flow recirculates at the leading edge. Through the analysis of the vorticity transport results in the impeller with different numbers of blades, it is found that the reasons for the increase in the values of the vorticity transport in the stall condition are mainly impacted by the swirl flow at the impeller inlet, the tip leakage flow at the leading edge and the increased unsteady flow structures.

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