High head pump-turbine: Pumping mode numerical simulations with a cavitation model for off-design conditions

Ješe, Uroš; Patella, Régiane Fortes; Antheaume, Sylvain

doi:10.1088/1755-1315/22/3/032048

Cited by 17 publications

(11 citation statements)

References 3 publications

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“…In a previous paper [12] it has been shown that the hump was related to the losses, which occur due to flow behavior inside the distributor. To study the effects of the mesh and the periodicity, the combined mesh was created ('Sim-combine 14°'), using a periodicity in the impeller area and full distributor mesh.…”

Section: Guide Vanes Opening 14°mentioning

confidence: 96%

“…Moreover, presented type of geometry enables the use of the periodicity boundary conditions between the blades. That kind of boundary condition was used during our last paper, presented by Ješe [12] in 2014 and partly during the present study. Constant mass flow rate was used as a boundary condition at the inlet and the static pressure at the outlet of the domain.…”

Section: Numerical Setup Analysismentioning

confidence: 99%

“…Cavitation influence on the hump region has been investigated phenomenologically with the periodic mesh. Several cavitation analyses related to the cavitation behavior have been presented in [12] for opening 14°. Those analyses have been improved and Fig.…”

Section: Cavitation Influence On the Hump Regionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Study of Pump-Turbine Instabilities Under Pumping Mode Off-Design Conditions

2015

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Pumped storage power plants, using reversible pumpturbines, are a great solution to maintain the stability of an electrical network. The continuous operating area of reversible pump-turbines machines is usually delimited by cavitation or a hydraulic instability called hump phenomena at part load. If the machine operates under these off-design conditions, it might be exposed to vibrations and performance losses.The paper focuses on the numerical analysis of the pumping mode regime and pays special attention to the prediction of the hump shaped characteristic curve and associated rotating stall. The investigations were made on a high head pump-turbine design (nq=27) at model scale for four different guide vane opening angles and a wide range of flow rates. Numerical simulations were performed and analyzed in LEGI and were compared to the global experimental data, provided by Alstom Hydro.

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Section: Guide Vanes Opening 14°mentioning

confidence: 96%

Section: Numerical Setup Analysismentioning

confidence: 99%

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Numerical Study of Pump-Turbine Instabilities Under Pumping Mode Off-Design Conditions

2015

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“…For the simulation of cavitating flows in tubopump inducers of spatial rockets, [6] proposed a sinus barotropic law with a vapour saturation pressure calculated from local temperature in the flow. Those robust approaches have provided interesting results for the simulation of hydrofoils [7], venturies [8], turbopump inducers [9,10,11], pumpturbines [12] or fuel injectors [13]. Although the simplicity of this modelling approach, this model enable to study complex industrial applications.…”

Section: Introductionmentioning

confidence: 99%

On numerical simulation of cavitating flows under thermal regime

Colombet

Silva

Patella

2017

International Journal of Heat and Mass Transfer

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International audienceIn this work, we investigate closure laws for the description of interfacial mass transfer in cavitating flowsunder thermal regime. In a first part, we show that, if bubble resident time in the low pressure area of theflow is larger than the inertial/thermal regime transition time, bubble expansion are no longer monitoredby Rayleigh equation, but by heat transfer in the liquid phase at bubbles surfaces. The modelling of inter-facial heat transfer depends thus on a Nusselt number that is a function of the Jakob number and of thebubble thermal Péclet number. This original approach has the advantage to include the kinetic of phasechange in the description of cavitating flow and thus to link interfacial heat flux to interfacial mass fluxduring vapour production. The behaviour of such a model is evaluated for the case of inviscid cavitatingflow in expansion tubes for water and refrigerant R114 using a four equations mixture model. Comparedwith inertial regime (Rayleigh equation), results obtained considering thermal regime seem to predictlower local gas volume fraction maxima as well as lower gradients of velocity and gas volume fraction.It is observed that global vapour production is closely monitored by volumetric interfacial area (bubblesize and gas volume fraction) and mainly by the Jakob number variations. It is found that, in contrast withphase change occurring in common boiling flow, Jakob number variation is influenced by phasic temper-ature difference but also by density ratio variation with pressure and temperature

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“…Even the numerical simulation results were consistent with the experimental results, the criterion of inception cavitation are not clear. Jese et al [6] also gave an experimental-verified simulation for the inception cavitation in pump-turbine, they used the void ratio in the first cavitating cell as the criterion of inception cavitation. The numerical results also matched well with the experimental data, but there were only the simulations under off-design conditions.…”

Section: Introductionmentioning

confidence: 99%

Predicting the Inception Cavitation of a Reversible Pump- Turbine in Pump Mode

Tao

Xiao

Zhu

et al. 2015

J. Phys.: Conf. Ser.

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Abstract. Inception cavitation is a crucial indicator for reversible pump-turbines especially in pump mode. In actual applications, it is difficult to use CFD for the inception cavitation character. In this study, CFD simulation is conducted to find a proper way to evaluate the inception cavitation, different levels of vapor volume fraction in the impeller is predicted based on the tested results. Results show that the prediction of the location and scale of cavitation is accurate. The predicted cavitation number also matches the experimental data well. The vapor volume fraction levels from 0.0001% to 0.001% are recommended as the criterion of inception cavitation.

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High head pump-turbine: Pumping mode numerical simulations with a cavitation model for off-design conditions

Cited by 17 publications

References 3 publications

Numerical Study of Pump-Turbine Instabilities Under Pumping Mode Off-Design Conditions

Numerical Study of Pump-Turbine Instabilities Under Pumping Mode Off-Design Conditions

On numerical simulation of cavitating flows under thermal regime

Predicting the Inception Cavitation of a Reversible Pump- Turbine in Pump Mode

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