Blar i Institutt for energi og prosessteknikk på tidsskrift "International Journal of Fluid Machinery and Systems"

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    • Blade passage modeling strategy for hydraulic turbine 

      Gong, Ruzhi; Trivedi, Chirag; Dahlhaug, Ole Gunnar; Nielsen, Torbjørn Kristian (Journal article; Peer reviewed, 2017)
      CFD has played a significant role to investigate the performance and improve the design of hydraulic turbines; however, the improvement of CFD method demands powerful computer resources including time, CPU, memory, and ...

    • A comprehensive review of verification and validation techniques applied to hydraulic turbines 

      Trivedi, Chirag; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2019)
      The paper critically reviews the verification and validation (VV) techniques applied to investigate hydraulic turbines. Although there are well-established standards such as AIAA G-077-1998 and ERCOFTAC guide for turbulence ...

    • Fast transition from pump to turbine mode of operation 

      Svarstad, Magni Fjørtoft; Nielsen, Torbjørn Kristian (Journal article; Peer reviewed, 2018)
      The reversible pump turbine (RPT) is a suitable machine to control fluctuations in the energy market. The usage of RPTs for this purpose will increase the number of operational mode changes of the machine. In order to ...

    • Hydrodynamic Damping of a Fluttering Hydrofoil in High-speed Flows 

      Bergan, Carl Werdelin; Solemslie, Bjørn Winther; Østby, Petter Thorvald Haug; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2018)
      A hydrofoil resembling a high head Francis runner blade was submerged in a rectangular channel and attached to the walls in a fixed-beam configuration. The hydrofoil was excited by piezoelectric Macrofiber composite actuators ...

    • Numerical Generation of Hill-Diagrams; Validation on the Francis99 Model Turbine 

      Tengs, Erik Os; Storli, Pål-Tore Selbo; Holst, Martin (Journal article; Peer reviewed, 2018)
      This article compares a numerically simulated, and an experimentally obtained Hill-Diagram. The Francis99 model turbine was used in the validation. By using steady-state simulations and passage modeling in ANSYS CFX, the ...

    • The Rotor-Stator Interaction Onboard a Low Specific speed Francis Turbine 

      Agnalt, Einar; Solemslie, Bjørn Winther; Storli, Pål-Tore Selbo; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2020)
      Over the last years, several breakdowns in hydropower plants with low specific speed Francis runners have been reported. One of the main excitation forces in such runners is the pressure fluctuations originating from the ...

    • Simulations of the dynamic load in a francis runner based on measurements of grid frequency variations 

      Ellingsen, Rakel; Storli, Pål-Tore Selbo (Journal article; Peer reviewed, 2015)
      In the Nordic grid, a trend observed the recent years is the increase in grid frequency variations, which means the frequency is outside the normal range (49.9-50.1 Hz) more often. Variations in the grid frequency leads ...