Browsing NTNU Open by Author "Nielsen, Torbjørn Kristian"

Now showing items 1-20 of 76

    • 3D Simulering av pumpeturbinkarakteristikker 

      Olimstad, Grunde (Master thesis, 2009)
      I oppgaven har karakteristikkene for en pumpeturbin blitt simulert. Verktøyet for simuleringene har vært OpenFOAM. Griddene til simuleringene ble laget i Gambit og ble importert til OpenFOAM via fluent gridformat. Geometrien ...

    • 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 ...

    • Analysis of Micro Hydropower Plant Connected to Microgrid in Island Mode Operation Consisting of Pump-as-Turbine, Self-Excited Induction Generator and Induction Generator Controller 

      Mo, Ragnhild Petterteig (Master thesis, 2020)
      Målet med denne masteroppgaven har vært å analysere et billig, robust og enkelt mikro-vannkraftverk bestående av en pumpe-som-turbin (PAT), en egenmagnetisert asynkrongenerator (SEIG) og en asynkrongenerator-kontroller ...

    • 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 ...

    • Catchment Based Aerodynamic Performance Analysis of Small Wind Turbine Using a Single Blade Concept for a Low Cost of Energy 

      Kelele, Hailay Kiros; Nielsen, Torbjørn Kristian; Froyd, Lars; Kahsay, Mulu Bayray (Journal article; Peer reviewed, 2020)

    • 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 ...

    • CFD simulations and verification with respect to head curves and NPSHr 

      Tabutiaux, Kristoffer V (Master thesis, 2014)
      The purpose of this thesis is to study the difference between simulation and test of a particular centrifugal pump design by Frank Mohn Flatøy AS (FRAMO). The pump has previously been tested and data from NPSH test and ...

    • Characterization of Aerodynamics of Small Wind Turbine Blade for Enhanced Performance and Low Cost of Energy 

      Kelele, Hailay Kiros; Frøyd, Lars; Kahsay, Mulu Bayray; Nielsen, Torbjørn Kristian (Peer reviewed; Journal article, 2022)
      During a turbine’s lifetime, minimizing the cost of power production should be the primary aim in addition to attaining high technical efficiency. Thus, this paper was aimed at enhancing the aerodynamic efficiency of a ...

    • Continuous Measurements for Detection of Cavitation Caused by Transients in Hydropower Plants and Fluid Transport Systems 

      Ruud, Kjetil Guddal (Master thesis, 2014)
      Surveillance of operating power plants is a progressing science in the hydropower sector. The efficiency improvements are closing in on the limits and reducing the costs by improvement of turbine life time seems to be a ...

    • Demping av U-røyrsvingingar i vasskraftverk 

      Sellevold, Mons Ole Dyvik (Master thesis, 2013)
      Det er i denne oppgåva sett på mulegheitene for å gjennomføra eit storskala u-røyrforsøk ved Vannkraftlaboratoriet ved NTNU. Eit slikt forsøk må kunna måla transient hastigheitsprofil til vatnet som oscillerer. Det er ...

    • Design av kontraroterende aksialturbin 

      Haugli, Rasmus Næss (Master thesis, 2010)
      Målene med oppgaven var meget sprikende, men alt ledet frem til en endelig design for en kontraroterende aksialturbin som i samarbeid med Lycro A/S skulle bunne ut i en mekanisk design. For å kartlegge de endelige ...

    • Design of Centrifugal Pump for Produced Water 

      Foslie, Sverre Stefanussen (Master thesis, 2013)
      During the spring of 2008, Jón Bergmann Heimisson developed a pump design program in Matlab. The program has been further developed during the work with this thesis, as well as in the author's preceding project thesis, ...

    • Design system for primary calibration of flow 

      Seierstad, Johanne (Master thesis, 2013)
      Whilst growing demand for energy in Nepal and neighbouring- countries, investments in hydro- power projects appears continuously, both by local and multinational companies. As a consequence of this, Turbine Testing Lab was ...

    • Dynamic analysis of a system with RPT 

      Veie, Carl Andreas (Master thesis, 2018)
      The purpose of this master thesis is to establish and validate a simulation model of the transition from pump to turbine mode of operation for hydropower systems with reversible pump-turbines (RPTs). The model builds on ...

    • 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 ...

    • Dynamic load on High Head Francis turbines during start/stop 

      Haga, Sigurd Tangerud (Master thesis, 2014)
      Pressure measurements were performed on the Francis runner in the Waterpower laboratory at NTNU. These measurements were divided into start and stop procedures, with the generator on or off. The suggested method that was ...

    • Dynamic Loads on Francis Turbines: An Experimental Study 

      Bergan, Carl Werdelin (Doctoral theses at NTNU;2019:64, Doctoral thesis, 2019)
      There is an increasing need for stable and flexible renewable energy. This calls for better lifetime predictions for Francis runners, which in turn requires more knowledge on the dynamic loads on the runner blades. This ...

    • Dynamisk analyse av sylindrisk olje demper system 

      Ogård, Marius (Master thesis, 2013)
      Denne masteroppgaven omhandler en dynamisk fluidanalyse av et system bestående av to i utgangspunktet konsentriske sylindre som kan bevege seg i forhold til hverandre. Oppgaven har tatt for seg utviklingen av en dynamisk ...

    • Dynamisk analyse av sylindrisk olje demper system 

      Øgård, Marius (Master thesis, 2013)
      Denne masteroppgaven omhandler en dynamisk fluidanalyse av et system bestående av to i utgangspunktet konsentriske sylindre som kan bevege seg i forhold til hverandre. Oppgaven har tatt for seg utviklingen av en dynamisk ...

    • Dynamisk Analyse av vannkraftverk 

      Stople, Remi Andre (Master thesis, 2012)
      Det er i denne rapporten gjennomført dynamisk analyse av to kraftverk under prosjektering av BKK, Aldal Kraftverk og Nye Frøland Kraftverk. Analysen omfatter elastisk simulering av opp- og nedsving i svingesjakter og ...