• A New Technical Concept for Water Management and Possible Uses in Future Water Systems 

      Storli, Pål-Tore Selbo; Lundstrøm, T. Staffan (Journal article; Peer reviewed, 2019)
      A new degree of freedom in water management is presented here. This is obtained by displacing water, and in this paper is conceptually explained by two methods: using an excavated cavern as a container for compressed air ...
    • A test of the v 2-f k-epsilon turbulence model for the prediction of vortex shedding in the Francis-99 hydrofoil test case 

      Sagmo, Kristian Forfot; Storli, Pål-Tore Selbo (Journal article; Peer reviewed, 2019)
      A test of the v 2 − f k − epsilon turbulence model for the flow around the Francis-99 hydrofoil geometry is conducted in order to assess it's accuracy of trailing edge vortex shedding prediction. The model is based on the ...
    • Design of Groundwater Heat Pump Systems. Principles, Tools, and Strategies for Controlling Gas and Precipitation Problems 

      Gjengedal, Sondre; Stenvik, Lars Aaberg; Storli, Pål-Tore Selbo; Ramstad, Randi Kalskin; Hilmo, Bernt Olav; Frengstad, Bjørn S. (Journal article; Peer reviewed, 2019)
      The utilization of groundwater heat pump systems is increasing in Norway, which are currently widely employed for heating and cooling applications in the town center of Melhus. The investigations of the Melhus installations ...
    • Dynamic load on a Francis turbine runner from simulations based on measurements 

      Storli, Pål-Tore Selbo; Nielsen, Torbjørn Kristian (Journal article; Peer reviewed, 2014)
      The frequency of the Nordic power grid has become more volatile during recent years. This gives rise to two effects in synchronous machines. Firstly, as grid frequency changes the rotational speed of synchronous machines ...
    • Fast Transition between Operational Modes of a reversible Pump-Turbine 

      Svarstad, Magni Fjørtoft (Doctoral theses at NTNU;2019:49, Doctoral thesis, 2019)
      The future demands of energy production to balance more intermittent energy sources creates two main technical challenges for the hydro power production. Increased off-design operation, including both operation outside ...
    • Francis-99: Coupled simulation of the resonance effects in runner channels 

      Tengs, Erik Os; Fevåg, Live Salvesen; Storli, Pål-Tore Selbo (Journal article; Peer reviewed, 2019)
      A resonance phenomenon is observed experimentally in the runner channels of the Francis-99 model turbine runner. An incompressible CFD simulation is unable to simulate this. Two different coupled physics schemes are therefore ...
    • Hydropower 

      Cavazzini, Giovanna; Storli, Pål-Tore Selbo; Nielsen, Torbjørn Kristian (Chapter, 2021)
      Hydropower has a very long tradition in many countries and was first used to provide working power for grinding corn, sawing timber and other previously manual tasks. The development of the modern turbine took a big step ...
    • Investigation of corner vortex in radial cascade and interaction with the trailing edge vortex 

      Kamalaraja, Arunn (Master thesis, 2021)
      Virvelavløsning fra objekter er et strømningsfenomen som kan finnes blant industrielle applikasjoner. Strømningsfenomenet avløser virvler som fører til vibrasjon. Denne vibrasjonen kan forsterkes, dersom virvelavløsningsfrekvensen ...
    • Measurements and simulations of turbines on common grid 

      Nielsen, Torbjørn Kristian; Storli, Pål-Tore Selbo (Journal article; Peer reviewed, 2014)
      Speed droop control is of basic importance for the primary governing in the Nordic grid. The speed droop control. a mandatory and build-in regulatory loop on all larger units. is automatically changing the produced power ...
    • Model Order Reduction Technique Applied on Harmonic Analysis of a Submerged Vibrating Blade 

      Tengs, Erik Os; Charrassier, Flora; Storli, Pål-Tore Selbo; Holst, Martin (Journal article; Peer reviewed, 2019)
      As part of an ongoing study into hydropower runner failure, a submerged, vibrating blade is investigated both experimentally and numerically. The numerical simulations performed are fully coupled acoustic-structural ...
    • Modelica model of transient pipe flow in hydraulic laboratory systems using the method of characteristics 

      Hinna, Jonas Tveit (Master thesis, 2021)
      Eksperimentelle oppsett i hydrauliske laboratoriesystemer er ofte avanserte. Målinger, f.eks. ved innløpet til turbiner, kan bli påvirket av det hydrauliske oppsettet og av karakteristikken til strømningen oppstrøms i ...
    • 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 ...
    • 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 ...
    • 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 ...