Browsing NTNU Open by Author "Solemslie, Bjørn Winther"

Now showing items 1-20 of 39

    • A generic lifetime estimation model for Francis turbines 

      Hvistendahl, Eivind (Master thesis, 2022)
      Ettersom mer intermitterende energikilder kobles til strømnettet må Francisturbiner i økende grad tilby balanseringstjenester. Dette fører til at turbinene periodisk opererer i suboptimale konfigurasjoner. Siden Francisturbiner ...

    • A reference pelton turbine - design and efficiency measurements 

      Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2014)
      The Pelton turbine has been subject to a varying degree of research interest since the debut of the technology over a century ago. Despite its age there are gaps in the knowledge concerning the flow mechanisms effecting ...

    • An Experimental Investigation of the Hydroynamic Damping of Vibrating Hydrofoils 

      Bergan, Carl Werdelin; Tengs, Erik Os; Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2019)
      As Francis turbines are chasing a higher efficiency, while trying to accommodate a wider load region, turbine blade fatigue is becoming a more pronounced problem. Details of the Fluid-Structure Interaction (FSI) between ...

    • Calibration and uncertainty analysis of pressure sensors used for dynamic measurements 

      Melaaen, Aase Sørum (Master thesis, 2017)
      Dynamic calibration of pressure sensors is challenging. Often, steady-state calibration is applied on pressure sensors used to measure dynamical measurements. Steady-state calibration does not represent the dynamic behavior ...

    • Calibration of strain gauges on a model runner blade combining numerical and experimental data 

      Kverno, Johannes Opedal; Iliev, Igor; Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2023)
      In this paper, we present the calibration setup, method, and results for a set of strain gauges installed on the trailing edge of the runner blades of a model Francis turbine. The calibration work is done as a step in the ...

    • CFD Analysis of a Pelton Turbine in OpenFOAM 

      Rygg, Jone Rivrud (Master thesis, 2013)
      During the spring of 2012, Lorentz Fjellanger Barstad developed a method for modelling the flow in a Pelton turbine subject to a high-speed water jet using the Computational Fluid Dynamics (CFD) software ANSYS CFX. The ...

    • Challenges with onboard strain measurements on a model Francis turbine runner 

      Kverno, Johannes Opedal; Vefring, Gaute Elde; Iliev, Igor; Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2023)
      As the world transitions towards more renewable energy sources, as a step to reduce the emissions of CO2, intermittent and non-dispatchable sources like solar and wind will take up a larger proportion of the energy production. ...

    • Damping Measurements on a Multi-Blade Cascade with Multiple Degrees of Freedom: A Francis-99 Test Case 

      Bergan, Carl Werdelin; Tengs, Erik Os; Solemslie, Bjørn Winther; Østby, Petter Thorvald Krogh; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2019)
      Due to thinner blades and higher demands for flexibility, the high-head Francis runners designed today face considerable challenges that severely affect the runners' expected lifetime. For many high-head Francis runners, ...

    • Design-Optimization of a Francis turbine draft tube 

      Herland, Ingelin (Master thesis, 2020)
      Denne masteroppgaven omhandler optimalisering av sugerøret til en Francisturbin som opererer på variabelt turtall. Forbedrede design er diskutert relativt et referansedesign, i form av økt trykkgjenvinning gjennom sugerøret ...

    • Development of a Francis Turbine Test Rig at Kathmandu University 

      Engøy, Andrea (Master thesis, 2019)
      Nepal har et stort potensial for vannkraft som ikke er utnyttet. Denne masteroppgaven er en del av det langvarige samarbeidet mellom Kathmandu University (KU) og Norges teknisk-naturvitenskapelige universitet (NTNU) for å ...

    • Development of a Francis Turbine Test Rig at Kathmandu University 

      Grefstad, Morten (Master thesis, 2017)
      The focus on hydropower development in Nepal has increased as consequence of the growing energy demand in the region. To render possible locally executed performance tests on model turbines, the Turbine Testing Laboratory ...

    • Development of a Francis Turbine Test Rig at Kathmandu University 

      Bådsvik, Julia Kiri Ellinor (Master thesis, 2019)
      Denne masteroppgaven er en del av prosjektet EnergizeNepal, som har som mål å utvikle og bygge en francisturbin-testrigg for Universitetet i Kathmandu som oppfyller kravene i IEC60193. Nepal har store vannkraftressurser, ...

    • Evaluating natural degassing in a river to create a baseline for comparison to technical degassing methods. 

      Kuhn, Wolf Ludwig; Solemslie, Bjørn Winther; Hihn, Jean-Yves; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2023)
      In Norway, a recent project used a risk matrix to identify about 200 hydropower plants ( 11 % of the total number) of being in high risk of producing air-supersaturated water. The combined installed capacity of these ...

    • Evaluation of ultrasonic degasification as a tool to mitigate total dissolved gas supersaturation downstream hydropower plants 

      Kuhn, Wolf Ludwig (Doctoral theses at NTNU;2023:445, Doctoral thesis, 2023)
      This Doctoral Thesis evaluates ultrasonic degasification as a potential tool for mitigating total dissolved gas (TDG) supersaturation in the river downstream a hydropower plant. The volumetric liquid-gas mass transfer ...

    • Experimental methods and design of a Pelton bucket 

      Solemslie, Bjørn Winther (Doctoral thesis at NTNU;2016:01, Doctoral thesis, 2016)
      The Pelton turbine is a widely used technology for power generation first patented in 1880. Despite being a mature technology, there is still little published knowledge regarding the design method of Pelton turbines. ...

    • Experimental Study of a Low-Specific Speed Francis Model Runner during Resonance 

      Agnalt, Einar; Østby, Petter Thorvald Krogh; Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2018)
      An analysis of the pressure in a runner channel of a low-specific speed Francis model runner during resonance is presented, which includes experiments and the development of a pressure model to estimate both the convective ...

    • How to avoid gas supersaturation in the river downstream a hydropower plant 

      Rognerud, Maren Elise (Master thesis, 2020)
      Gassovermetning i vannkraftverk er en lite kjent, men veldig alvorlig tilstand som har påvirket biologisk mangfold negativt i flere vassdrag i Norge. Det er kjent at 10 kraftverk har hatt redusert biologisk mangfold på ...

    • How to Avoid Total Dissolved Gas Supersaturation in Water from Hydropower Plants by Employing Ultrasound 

      Rognerud, Maren Elise; Solemslie, Bjørn Winther; Islam, Md Hujjatul; Pollet, Bruno (Peer reviewed; Journal article, 2020)
      In Norway, more than 10 hydropower plants are known to have caused biologically relevant levels of total dissolved gas supersaturation in the rivers downstream power plants. This phenomenon is causing fish kills due to gas ...

    • 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 ...

    • Modal testing of the Francis-99 runner 

      Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar; Sigurdsson, Bjarki; Tengs, Erik Os (Peer reviewed; Journal article, 2021)
      The Francis-99 low specific speed Francis runner has undergone much study in the years since it was first made available to the public. The High Head Francis(HiFrancis) project, hosted by the Waterpower Laboratory at NTNU, ...