Now showing items 1-20 of 123

    • A new Design of a Francis Turbine in order to reduce Sediment Erosion 

      Meland, Hallvard (Master thesis, 2010)
      This Master Thesis is about the sand erosion challenges with the Francis turbines. The background for studying this subject is the fact that the sand erosion problem is a very negative factor for the development of new ...
    • 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 ...
    • Aeroelastic analysis of an offshore wind turbine: Design and Fatigue Performance of Large Utility-Scale Wind Turbine Blades 

      Fossum, Peter Kalsaas (Master thesis, 2012)
      Aeroelastic design and fatigue analysis of large utility-scale wind turbine blades are performed. The applied fatigue model is based on established methods and is incorporated in an iterative numerical design tool for ...
    • Aeroelastic Instability and Flutter for a 10 MW Wind Turbine 

      Vatne, Sigrid Ringdalen (Master thesis, 2011)
      The goal of this thesis is to evaluate if flutter is a challenge to a 10 MW wind turbine. Flutter is an aeroelastic instability which occurs due to the interaction between the aerodynamic forces and the elasticity of the ...
    • AlternaFuture - Final Report 

      Vereide, Kaspar; Mo, Birger; Forseth, Torbjørn; Lia, Leif; Nysveen, Arne; Dahlhaug, Ole Gunnar; Schäffer, Linn Emelie; Bustos, Ana Adeva; Sundt-Hansen, Line; Øvregård, Eirik; Glimen, Pål; Hesthagen, Trygve; Skår, Margrete; Nielsen, Torbjørn Kristian (HydroCen Report;18, Research report, 2020)
      AlternaFuture has been a multidisciplinary research project in Hydrocen to investigate the potential of extreme upgrading of existing hydropower system with a positive effect on the environmental conditions. The project ...
    • 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 ...
    • Beslutningsstøtte med kontinuerlig virkningsgradsmåling i vannkraftverk 

      Ruud, Einar Johan (Master thesis, 2017)
      Fremtidens energimiks i Nord-Europa er preget av en stadig større andel uforutsigbare fornybare energikilder som vind og sol, og dette medfører utfordringer for produksjonsplanlegging og regulering av kraftproduksjon. Det ...
    • 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 ...
    • 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 

      Barstad, Lorentz Fjellanger (Master thesis, 2012)
      A Pelton design software is currently being developed at the Waterpower laboratory at NTNU. The motivation behind this software is to streamline the parametric design process for Pelton turbines. A numerical flow model is ...
    • CFD Analysis of Wave Induced Loads on Tidal Turbine Blades 

      Holst, Martin Aasved (Master thesis, 2012)
      Abstract— The object of this paper is to investigate the influence of wave-current interaction on a tidal turbine. An experiment at Norwegian Marine Technology Research Institute (MARINTEK) has been carried out, and a CFD ...
    • CFD Study of a 10 MW Offshore Horizontal Axis Wind Turbine Blade 

      Tande, Jørgen Jensen (Master thesis, 2011)
      This Master thesis is a study of wind turbine aerodynamics on a 10 MW offshore wind turbine blade with a Computational Fluid Dynamics, CFD, approach.The objectives for the thesis were, (i) make a Computer Aided Design, ...
    • CFD-analyse av en høytrykks Francis turbin 

      Holo, Anders Linde (Master thesis, 2011)
      I denne masteroppgaven har det blitt gjennomført «fluid structure interaction» (FSI) simuleringer av modellturbinen fra Tokke, ved innløpsbetingelser som var rapportert å gjelde ved best driftspunkt. Simuleringsresultatene ...
    • CFD-analyse av løpehjul og sugerør i en Francis turbin 

      Breivik, Simen Røst (Master thesis, 2011)
      Denne masteroppgaven evaluerer svingningene is sugerørsstrømingen til en Francis turbinved dellast. Bakgrunnen for dette studiet er delvis på grunn av verdens økende energibehov. Med varierende energipriser og vannivåer i ...
    • 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 ...
    • Control system on a wind turbine 

      Varpe, Steffen Andreas (Master thesis, 2008)
      The aim for this project is to prepare a wind turbine controller and a wind turbine computer model suitable for controller development. The wind turbine is a Vestas V27, and the wind turbine drive train is modified by ...
    • Control System on a Wind Turbine: Evaluation of Control Strategies for a Wind Turbine with Hydraulic Drive Train by Means of Aeroelastic Analysis 

      Frøyd, Lars (Master thesis, 2009)
      The evolution of wind turbines are going towards floating offshore structures. To improve the stability of these turbines, the weight of the nacelle should be as low as possible. The company ChapDrive has developed a ...
    • 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 and Dynamic Modeling of the Support Structure for a 10 MW Offshore Wind Turbine 

      Crozier, Aina (Master thesis, 2011)
      This thesis presents two designs of tension-leg-platforms (TLP) support structures for the 10 MW reference wind turbine being developed by the Norwegian Research Centre for Offshore Wind Technology (NOWITECH). The designs ...
    • Design and operation of a Francis Turbine with Variable Speed Capabilities 

      Sundfør, Else Høeg (Master thesis, 2017)
      Statkraft recently decided to develop 1000 MW of wind energy in the middle of Norway. Wind power is an unreliable energy source. Hydropower is therefore needed to balance energy production supplied to the grid. However, ...