Numerical Hill Chart Prediction by Means of CFD Stage Simulation for a Complete Francis Turbine

Keck, Helmut; Drtina, Peter; Sick, Mirjam

doi:10.1007/978-94-010-9385-9_16

Cited by 13 publications

(9 citation statements)

References 2 publications

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“…All these models are common in this fact that they lower the time-dependent interaction between the stator and the rotor domains to a steady-state problem, but they are different in the way how the upstream disturbances are transported across the interface [8].…”

Section: Grid Generationmentioning

confidence: 99%

“…Three models for rotor-stator interface [8] To simulate the previously described stage, a mixing plane model was utilized for the steady-state problems, and the result of the frozen rotor was taken as an initial estimation of the unsteady solution, where the latter, i.e. sliding plane, was implemented for the unsteady simulations.…”

Section: Figurementioning

confidence: 99%

“…Keck et al [8] used a full stage simulation method to calculate the hill chart of a Francis turbine and compared it with the experimental results. They used TASK Flow code to solve three-dimensional equation of Reynolds Averaged Navier-Stokes (RANS), while the turbulence effects are modelled using standard k−ε model.…”

Section: Introductionmentioning

confidence: 99%

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Fluid flow modelling through an axial-flow microhydro turbine

et al. 2015

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Original scientific paper In this study, a three-dimensional fluid field of axial-flow type microhydro named Agnew has been investigated. All numerical simulations were performed using OpenFOAM, an open source computational fluid dynamic (CFD) code, to investigate the rotor-stator interaction and losses occurring in the turbine. A sliding interface plane was used to pass the disturbance of stationary domain to rotary domain and vice versa. Several turbulence models were also examined together with wall function in order to take into account the turbulence in the flow. The obtained results show that a high resolution advection scheme, mixing plane to model the rotor-stator interaction together with a turbulence intensity of I = 6 % at the inlet, best matches with the experimental results. Keywords: energy loss coefficient; microhydro; numerical simulation; rotor-stator interaction; turbulence modelling Modeliranje strujanja fluida pomoću aksijalne mikrohidro turbineIzvorni znanstveni članak U ovom je istraživanju analizirano trodimenzionalno polje fluida aksijalne mikrohidro turbine nazvane Agnew. Sve numeričke simulacije su izvedene pomoću OpenFOAM, računalnog koda dinamike fluida otvorenog izvora (CFD), kako bi se istražila interakcija rotor-stator i gubitci koji nastaju u turbini. Klizna dodirna ravnina korištena je da se poremećaj stacionarne domene prenese na rotacijsku domenu i obratno. Također je ispitano nekoliko modela turbulencije zajedno s funkcijom zida kako bi se uzela u obzir turbulencija u strujanju. Dobiveni rezultati pokazuju da schema advekcije visoke rezolucije, koja kombinira dodirnu ravninu za modeliranje interakcije rotor-stator zajedno s intenzitetom turbulencije I = 6 % na ulazu, najbolje odgovara eksperimentalnim rezultatima.

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Section: Grid Generationmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Fluid flow modelling through an axial-flow microhydro turbine

et al. 2015

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“…Liquids, subsonic, transonic and supersank gas fiows can be analyzed. Details regarding the theoretical basis of the software are reported by Raw (1994) andin the ASC Theory Documentation (1995). The software has been previously applied to turbomachinery fiows and for fiow calculations in a wide variety of other components (Casey, Borth et al, 1995).…”

Section: Navier-stokes Codementioning

confidence: 99%

Validation of a Stage Calculation in a Francis Turbine

Sick

Casey

Galpin

1996

Hydraulic Machinery and Cavitation

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Abstract. This paper describes the verification of a simulation method for complete hydraulic turbine systems, from spiral casing through distributor and runner to the outlet draft tube. The method solves the steady 3D Reynolds-averaged Navier Stokes equations with a mixing plane at the interfaces between the components, so that the flow in each frame of reference is steady. The steady-state interactions between the components are taken into account but unsteady interactions are neglected. The paper verificates the method by comparison of computations with detailed flow measurements from a high specific speed Francis turbine model. Computations in which each component is computed in isolation are compared to computations using the mixing interface between components to demonstrate the advantages of the new technique.

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“…They proposed a streamline function of the flow through the runner to enable a quicker design process (Keck et al, 1996;1997;Krishna, 1997;Vu and Shy, 1994;Wu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Runner Design of Francis Turbine using Computational Fluid Dynamics

Kaewnai¹

2011

American Journal of Engineering and Applied Sciences

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Results:The first stage involves the calculation of various dimensions such as the blade inlet and exit angle at hub and the mean and shroud positions to depict the meridional plane. The second stage deals with the CFD simulation. Various results were calculated and analyzed for factors affecting runner's performance. Results indicated that the head rise of the runner at the design point was approximately 39 m, which is lower than the specified head. Based on past experiences, the meridional plane was modified and blade inlet and lean angles were corrected. The process of meridional plane modification was repeated until the head rise was nearly equal to the specified head. Velocity vector and streamline should be a uniform stream. Conclusion/Recommendations: Results from calculating runner's performance were approximately 90% at design point. Existing absolute velocity component from CFD simulation pointed out that swirling flow occurred at the exit of runner. Based on the comparison of runner's performance between simulation results and experimental data from previous work reported in the literature, it is possible to use this method to simulate runner's performance of the Francis turbine.

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Numerical Hill Chart Prediction by Means of CFD Stage Simulation for a Complete Francis Turbine

Cited by 13 publications

References 2 publications

Fluid flow modelling through an axial-flow microhydro turbine

Fluid flow modelling through an axial-flow microhydro turbine

Validation of a Stage Calculation in a Francis Turbine

Improvement of the Runner Design of Francis Turbine using Computational Fluid Dynamics

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