• Numerical simulation of cavitation on a reversible pump turbine with pre-rotation 

      Jenssen, Johan Christian (Master thesis, 2020)
      For å redusere effekten av klimaendringene, må CO2 utslippene reduseres betraktelig. En løsning er å øke kapasiteten av fornybare energikilder. Pumpekraftverk er i dag en av de vanligste metodene for å stabilisere strømnettet ...
    • Optimization procedure for variable speed turbine design 

      Tengs, Erik Os; Storli, Pål-Tore Selbo; Holst, Martin (Journal article; Peer reviewed, 2018)
      This article outlines a design procedure for variable speed Francis turbines using optimization software. A fully parameterized turbine design procedure is implemented in MATLAB. ANSYS CFX is used to create hill diagrams ...
    • Particle image velocimetry measurements in the vaneless space of a model Francis turbine under steady state operation 

      Forfot Sagmo, Kristian; Mærlie, Anja; Storli, Pål-Tore Selbo (Peer reviewed; Journal article, 2021)
      Two-dimensional, two component particle image velocimetry (PIV) measurements of the guide-vane wake and vaneless space for a high head Francis model turbine are presented. Measurements have been carried out with a fixed ...
    • Pump turbines in existing powerplants 

      Dahle, Pål (Master thesis, 2019)
      En brukervennlig metode for å designe kontraroterende aksialpumper har blitt utviklet ved bruk av Matlab. Grafiske brukergrensesnitt har blitt laget for å skrive inn designparametre og å vise designresultater. Designmetoden ...
    • Pump-Turbines in Conventional Hydropower Plants 

      Dagsvik, Helene Njølstad; Storli, Pål-Tore Selbo (Peer reviewed; Journal article, 2021)
      This paper proposes an innovative approach to retrofit existing hydropower plants with suitable upper and lower reservoirs into pumped storage. The conventional methods are both comprehensive and expensive, mainly due to ...
    • Rotor-Stator Interaction in Low-Specific Speed Francis Turbines 

      Agnalt, Einar (Doctoral theses at NTNU;2019:219, Doctoral thesis, 2019)
      Several breakdowns in hydropower plants with low specific speed Francis runners have been reported. These breakdowns are understood to be related to pressure pulsations, vibration modulus and the combination of these. One ...
    • 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 ...
    • Simulation and Discussion of Models for Hydraulic Francis Turbine Simulations 

      Storli, Pål-Tore Selbo; Nielsen, Torbjørn Kristian (Journal article; Peer reviewed, 2018)
      The paper presents simulations using three different models for a hydraulic turbine. The models are too simple and unrealistic to be used for actual simulations, but the intention is to discuss behaviour intrinsic to the ...
    • Simulation of Pressure Pulsations 

      Sanson, Odin Andre (Master thesis, 2020)
      Utmattelsesbelastning er den primære årsaken til turbinskade i vannkraftverk. Syklisk belastning fra trykkpulsasjoner kan forårsake slik utmattelsesbelastning. Tilegning av informasjon om trykkpulsasjoner, og samspillet ...
    • Simulations and Measurements of Friction in Oscillating Flow 

      Hamran, Kathrine Albjerk (Master thesis, 2019)
      Friksjonen i massesvingninger i vannkraftverk er ikke tilfredsstillende beskrevet, til tross for at friksjonstapet er viktig for virkningsgraden og stabiliteten til systemet, og optimalisering av kjøreplanen for kraftverket. ...
    • 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 ...
    • Strategic Research Agenda of the EERA Joint Programme Hydropower 

      Aberle, Jochen; Avellan, Francois; Boes, Robert; Cavazzini, Giovanna; Perez Diaz, Juan I.; Doujak, Eduard; Finger, David Christian; Hendrick, Patrick; Heidenreich, Sara; Köhler, Berit; Lundström, Staffan; Riedelbauch, Stefan; Siemonsmeier, Marius; Schürhuber, Robert; Skjelbred, Hans Ivar; Storli, Pål-Tore Selbo (Research report, 2019)
      The launch of a new EERA Joint Programme on Hydropower is good news for energy system in Europe and beyond. The clean energy transition is necessary, demanding and accelerating. Hydropower in Europe and worldwide represents ...
    • Trailing edge vortex shedding in hydraulic turbines and the effect of stream-wise vorticity on vortex induced vibrations 

      Sagmo, Kristian Forfot (Doctoral theses at NTNU;2021:42, Doctoral thesis, 2021)
      Experiments as well as some numerical simulations were conducted investigating the resonance region of vortex induced vibrations for different trailing edges of a hydrofoil in channel flow. The study focuses on the ...
    • Two-way coupled simulation of the Francis-99 hydrofoil using model order reduction 

      Tengs, Erik Os; Einzinger, Johannes; Storli, Pål-Tore Selbo (Journal article; Peer reviewed, 2019)
      The Francis-99 hydrofoil is simulated using a quasi two-way Fluid-Structure Interaction procedure. The structural domain is reduced by the use of modal decomposition, and solved for inside the commercial fluid solver ANSYS ...
    • Vortex generator's effect on trailing edge vortex shedding and fluid structure interaction 

      Besirovic, Hasan; Forfot Sagmo, Kristian; Storli, Pål-Tore Selbo (Peer reviewed; Journal article, 2020)
      An initial study of the effects vortex generators (VGs) have on the mitigation of vortex-induced vibrations (VIVs) of hydrofoils have been performed at the Waterpower laboratory of the Norwegian University of Science and ...
    • Vortex generator's effect on trailing edge wake and fluid structure interaction 

      Besirovic, Hasan (Master thesis, 2020)
      Detaljer rundt bruk av virvelgeneratorer i hydrodynamiske miljøer og deres effekter på mildning av virvelinduserte vibrasjoner er ennå ikke tilstrekkelig undersøkt i litteraturen. Vannkraftverk som er utsatt for disse ...