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Research Papers: Flows in Complex Systems

Investigation on Flow Characteristics of Pump-Turbine Runners With Large Blade Lean

[+] Author and Article Information
Baoshan Zhu

State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: bszhu@mail.tsinghua.edu.cn

Lei Tan

State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: tanlei@mail.tsinghua.edu.cncurrent

Xuhe Wang

State Grid XinYuan Company Ltd.,
Beijing 100761, China
e-mail: wangxuhe1985@163.com

Zhe Ma

State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: youjingyaoxiang@163.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 21, 2016; final manuscript received April 18, 2017; published online October 19, 2017. Assoc. Editor: Feng Liu.

J. Fluids Eng 140(3), 031101 (Oct 19, 2017) (9 pages) Paper No: FE-16-1113; doi: 10.1115/1.4037787 History: Received February 21, 2016; Revised April 18, 2017

Frequent changes in the operating modes pose significant challenges in the development of a pump-turbine with high efficiency and stability. In this paper, two pump-turbine runners, one with a large positive blade lean and the other with a large negative lean, are investigated numerically and experimentally. These two runners are designed by using the optimum stacking condition at the high pressure edge (HPE). The experimental and the numerical results show that both runners have good efficiency performances, and pressure fluctuations for the runner with a negative blade lean are much lower than those for the runner with a positive blade lean. The internal flow field analyses clarify the effects of the blade lean on the pressure distribution around the runner blades. In the turbine mode at partial load, the negative blade lean can control flow separation in the high pressure side of the runner and then reduce the pressure fluctuations in the vaneless space.

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Figures

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Fig. 1

The tested runners and the test rig: (a) runner A, (b) runner B, and (c) test rig

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Fig. 2

Blade loading distribution for the two runners

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Fig. 3

Meridional channel shape for the two runners

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Fig. 4

Full passage model and computational meshes: (a) full passage model, (b) the mesh of the guide vanes, and (c) the mesh of the runner

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Fig. 5

Measured efficiency characteristics of the tested runners under the pump mode: (a) runner A and (b) runner B

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Fig. 6

Measured efficiency curve under the turbine mode: (a) runner A and (b) runner B

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Fig. 7

Calculated and measured efficiency at guide vane opening A = 27.0 mm under the pump mode

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Fig. 8

Calculated and measured efficiency at guide vane opening A = 23.0 mm under the turbine mode

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Fig. 9

Pressure distribution at different spanwise locations under the pump mode: (a) hub, (b) middle span, and (c) shroud

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Fig. 10

Pressure distribution at different spanwise locations under the turbine mode: (a) hub, (b) middle span, and (c) shroud

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Fig. 11

Measured and calculated pressure fluctuation amplitude in the vaneless space under the turbine mode

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Fig. 12

Instantaneous pressure fluctuations on a monitor point in the vaneless space under the turbine mode: (a) runner A and (b) runner B

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Fig. 13

Instantaneous pressure distribution in the vaneless space for the two runners under the turbine mode: (a) runner A and (b) runner B

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Fig. 14

Instantaneous pressure distribution on the blade surfaces of runner A under the turbine mode: (a) pressure surface and (b) suction surface

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Fig. 15

Instantaneous pressure distribution on the blade surfaces of runner B under the turbine mode: (a) pressure surface and (b) suction surface

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