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Research Papers: Flows in Complex Systems

Numerical Simulation of a Pump–Turbine Transient Load Following Process in Pump Mode

[+] Author and Article Information
Giorgio Pavesi

Department of Industrial Engineering,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: giorgio.pavesi@unipd.it

Giovanna Cavazzini

Department of Industrial Engineering,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: giovanna.cavazzini@unipd.it

Guido Ardizzon

Department of Industrial Engineering,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: guido.ardizzon@unipd.it

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 13, 2016; final manuscript received July 18, 2017; published online November 3, 2017. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 140(2), 021114 (Nov 03, 2017) (9 pages) Paper No: FE-16-1600; doi: 10.1115/1.4037988 History: Received September 13, 2016; Revised July 18, 2017

This paper presents the simulation of the dynamic behavior of variable speed pump–turbine. A power reduction scenario at constant wicket gate opening was numerically analyzed from 100% to 93% rpm corresponding to a power reduction from full load to about 70% with a ramp rate of 1.5% per second. The flow field analysis led to the onset and development of unsteady phenomena progressively evolving in an organized rotating partial stall during the pump power reduction. These phenomena were characterized by frequency and time–frequency analyses of several numerical signals (pressure, blade torque, and flow rate in blade passages). The unsteady pattern in return channel strengthened emphasizing its characteristic frequency with the rotational velocity decreasing reaching a maximum and then disappearing. At lower rotational speed, the flow field into the wickets gates channel starts to manifest a full three-dimensional (3D) flow structure. This disturbance was related to the boundary layer separation and stall, and it was noticed by a specific frequency.

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References

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Figures

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Fig. 1

3D scheme of the tested configuration

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Fig. 2

Detail and sketch of the tested configuration (λ = 8 deg) with the distribution of monitor points

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Fig. 3

Comparison of simulated and experimental discharge factor nED at BEP condition for different mesh densities

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Fig. 4

Comparison between numerical and experimental head curves

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Fig. 5

Numerical dimensionless discharge–speed curve

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Fig. 6

Flow field inside the pump–turbine for nED = −0.458

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Fig. 7

Numerical dimensionless discharge–speed curves of three consecutive impeller channels

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Fig. 8

Flow field inside the pump–turbine for nED = −0.482

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Fig. 9

Numerical dimensionless discharge–speed in the return channels

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Fig. 10

Flow field inside the pump–turbine for nED = −0.482

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Fig. 11

Flow field inside the pump–turbine for nED = −0.472

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Fig. 12

Numerical dimensionless discharge–speed curves of the wicket gates

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Fig. 13

Pressure coefficient versus speed factor acquired in the wicket gate

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Fig. 14

Wicket gate torque factor versus speed factor

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Fig. 15

Normalized power-spectra of the discharge factor acquired in the return channels 2 of Fig. 2

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Fig. 16

Normalized power-spectra of the discharge factor acquired in the return channels 2 of Fig. 2

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Fig. 17

Normalized power-spectra of pressure and torque signal acquired on the wicket gate

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Fig. 18

Normalized power-spectra of pressure signal acquired in the wicket gate monitor point D12 of Fig. 2

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Fig. 19

Normalized power-spectra of torque signal of a wicket gate

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Fig. 20

Normalized power-spectra of pressure signal acquired on the wicket gate

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Fig. 21

Normalized power-spectra of pressure signal acquired in the return channel monitor point R11 of Fig. 2

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Fig. 22

Flow field inside the pump–turbine at different speed factors

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Fig. 23

Maximum and mean vorticity values (∇×V) evaluated in the return channel subdomain versus different speed factors

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Fig. 24

Flow field inside the wicket gates at different speed factors

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