0427 Partial flow characteristics of contra-rotating axial flow pump with reduced speed rear rotor design

To reveal the effect of tip clearance on the flow behaviors and pressurization performance of a helico-axial flow pump, the standard k-ε turbulence model is employed to simulate the flow characteristics in the self-developed helico-axial flow pump. The pressure, streamlines and turbulent kinetic energy in a helico-axial flow pump are analyzed. Results show that the tip leakage flow (TLF) forms a tip-separation vortex (TSV) when it enters the tip clearance and forms a tip-leakage vortex (TLV) when it leaves the tip clearance. As the blade tip clearance increases, the TLV moves along the blade from the leading edge (LE) to trailing edge (TE). At the same time, the entrainment between the TLV and the main flow deteriorates the flow pattern in the pump and causes great hydraulic loss. In addition, the existence of tip clearance also increases the possibility of TLV cavitation and has a great effect on the pressurization performance of the helico-axial flow pump. The research results provide the theoretical basis for the structural optimization design of the helico-axial flow pump.

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0428 Blade rows interaction of contra-rotating axial flow pump with reduced speed rear rotor design

The Proceedings of the Fluids engineering conference ◽

10.1299/jsmefed.2013._0428-01_ ◽

2013 ◽

Vol 2013 (0) ◽

pp. _0428-01_-_0428-02_

Author(s):

Hiroaki YOSHIMURA ◽

Linlin CAO ◽

Hironori HONDA ◽

Satoshi WATANABE ◽

Akinori FURUKAWA

Keyword(s):

Axial Flow ◽

Rotor Design ◽

Axial Flow Pump ◽

Flow Pump

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A Numerical Study on Axial Pump Performance for Large Cavitation Tunnel Operation

Processes ◽

10.3390/pr9091523 ◽

2021 ◽

Vol 9 (9) ◽

pp. 1523

Author(s):

Jung-Kyu Choi ◽

Hyoung-Tae Kim ◽

Chang-Sup Lee ◽

Seung-Jae Lee

Keyword(s):

Numerical Study ◽

Flow Characteristics ◽

Axial Flow ◽

Pressure Jump ◽

Axial Pump ◽

Cavitation Tunnel ◽

Axial Flow Pump ◽

Operating Points ◽

Flow Pump ◽

Good Agreement

In this paper, a numerical investigation was carried out on the performances of a designed axial flow pump for a large cavitation tunnel. From this, the flow characteristics, force, and torque performance of the axial flow pump were investigated, and the rotating speeds of the impeller satisfying the test section speed performances required in the large cavitation tunnel were estimated. The axial flow pump was modeled such that the impeller, stator, and nacelle were located in a cylindrical tunnel. The calculations were carried out for incompressible steady-state turbulent flow considering the impeller rotating. The performance of the pump was confirmed, finding that the head gain was caused by the pressure jump downstream of the pump. The performance of the stator was confirmed to be good enough to refine the tangential flow due to the impeller rotating. To investigate the operating performance of the large cavitation tunnel, the head loss of the entire tunnel without the pump was obtained from a numerical analysis. The operating points were estimated from the specific speed–head coefficient curves, and it was found that the present numerical results were in good agreement with the experiments.

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Massively parallel simulation of the flow characteristics in a submersible axial flow pump

Mechanics and Mechatronics (ICMM2015) ◽

10.1142/9789814699143_0027 ◽

2015 ◽

Author(s):

Hong-Ming Zhang ◽

Li-Xiang Zhang

Keyword(s):

Flow Characteristics ◽

Axial Flow ◽

Parallel Simulation ◽

Massively Parallel ◽

Axial Flow Pump ◽

Flow Pump

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Flow Characteristics of High-Efficient Axial Flow Pump System

ASME 2015 Power Conference ◽

10.1115/power2015-49300 ◽

2015 ◽

Author(s):

Chao Liu ◽

Fan Yang ◽

Yan Jin ◽

Hua Yang

Keyword(s):

Flow Characteristics ◽

Axial Flow ◽

Internal Flow ◽

Operating Conditions ◽

Optimum Operating ◽

Hydraulic Loss ◽

Pump System ◽

High Efficient ◽

Axial Flow Pump ◽

Flow Pump

Three-dimensional flow-fields in a high-efficient axial flow pump system were simulated by CFD to further study the internal flow characteristics. The internal flow patterns of the pump system were obtained at large, small and optimum operating conditions. The highest efficiency of pump system measured and calculated are 82.57% and 81% respectively at blade angle 0°. For the suction passage, the axial velocity distribution uniformity reach 97.51%, and the hydraulic loss is 0.039m, the pipe efficiency calculated is 98.5% at the optimum operating conditions. The maximum velocity is 1.429 m/s in the range of operating conditions, which meet the requirement of National standard. The performances predicted were compared with measurement results. It was found that the calculated results agree well with the measured results. The overall flow pattern of the pump system is uniform and smooth, and the hydraulic loss is very small which gives the excellent hydraulic performances of pump system.

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J051054 Reduced-Speed Rear Rotor Design of Counter-Rotating Axial Flow Pump

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2012._j051054-1 ◽

2012 ◽

Vol 2012 (0) ◽

pp. _J051054-1-_J051054-5

Author(s):

Toshiki IMANISHI ◽

Shinpei MOMOSAKI ◽

Satoshi WATANABE ◽

Akinori FURUKAWA ◽

LinLin Cao

Keyword(s):

Axial Flow ◽

Rotor Design ◽

Axial Flow Pump ◽

Flow Pump

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An analysis on the flow characteristics of bi-directional axial-flow pump under reverse operation

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy ◽

10.1177/0957650917695447 ◽

2017 ◽

Vol 231 (3) ◽

pp. 239-249 ◽

Cited By ~ 1

Author(s):

Pengfei Ma ◽

Jun Wang

Keyword(s):

Flow Characteristics ◽

Axial Flow ◽

Internal Flow ◽

Optimum Operating ◽

Reverse Direction ◽

Guide Vanes ◽

Flow Loss ◽

Axial Flow Pump ◽

Object Of Study ◽

Flow Pump

When the conventional bent guide vanes are applied to the bi-directional axial-flow pump, its performance declines considerably under reverse operation. Regarding a bi-directional axial-flow pump with high specific speed as the object of study, the variation of both hydraulic performance and internal flow field under reverse operation are analyzed in this paper. The results indicate that both the head and efficiency of the pump will drop greatly and the optimum operating point lean to the lower flow rate when it operates in the reverse direction, mainly due to the prewhirl caused by the guide vanes; the shedding vortex is formed after flow separation occurred near the trailing edge of blade, and its scale keeps increasing in the diffusing pipe during its motion until it collapses in the straight pipe, which is the major causes of the big flow loss and significant decline of the performance under reverse operation.

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