• 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 ...
    • 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 ...
    • 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, ...
    • 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 ...
    • Numerical Investigation of Flow Field subject to Vibrating Structure 

      Leonhardsen, Sondre (Master thesis, 2017)
      Hydraulic turbines are more often than before running at off-design conditions. The flow conditions outside the best efficiency point may increase the mechanical load, and hence fatigue, on the turbine blades. The flow-induced ...
    • Ny design av Peltondyse og distributør for økt virkningsgrad 

      Bertelsen, Jonas Breivik (Master thesis, 2015)
      Denne oppgaven er et forsøk på å finne en realiserbar modifikasjon på dysen og distributøren til en Peltonturbin, hvor målet med modifikasjonen er å øke den hydrauliske virkningsgraden til turbinen. Studien tar utgangspunkt ...
    • On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines 

      Agnalt, Einar; Iliev, Igor; Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2019)
      The rotor stator interaction in a low specific speed Francis model turbine and a pump-turbine is analyzed utilizing pressure sensors in the vaneless space and in the guide vane cascade. The measurements are analyzed relative ...
    • Onboard measurements of pressure pulsations in a high head Francis model runner 

      Agnalt, Einar; Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2019)
      Over the last years, there have been several incidents with cracks in high head Francis turbines. These cracks are understood to be related to pressure pulsations, vibration modulus and the combination of these. In this ...
    • Optimalisering av ringledning for Peltonturbin 

      Solemslie, Bjørn Winther (Master thesis, 2010)
      Hydroenergi er en norsk produsent av vannturbiner med godt etablert kunnskap innen Kaplan og Francis turbiner. Selskapet har designet flere Pelton skovler med det mål å redusere kavitasjon. Selskapet ønsket å finne et ...
    • Pelton Turbine - Model Test of a Runner 

      Larsen, Audun Tufte (Master thesis, 2015)
      Even though the Pelton turbine is more than a 100-year-old invention, there is still a lack of knowledge regarding the flow inside the bucket. A deeper understanding of the influence of bucket design on the flow behavior ...