Blar i NTNU Open på forfatter "Nielsen, Torbjørn Kristian"

Viser treff 41-60 av 76

    • Measuring the dynamic characteristics of a low specific speed pump-Turbine model 

      Walseth, Eve Cathrin; Nielsen, Torbjørn Kristian; Svingen, Bjørnar (Journal article; Peer reviewed, 2016)
      This paper presents results from an experiment performed to obtain the dynamic characteristics of a reversible pump-turbine model. The characteristics were measured in an open loop system where the turbine initially was ...

    • Micro Power Plant at Marangu Hotel, Kilimanjaro 

      Gjevik, Kristin (Master thesis, 2014)
      Development of micro-hydropower schemes in rural areas of developing countries is largely depended on simple and affordable systems. The contra-rotating pipe turbine, produced by GreenEnergy is a one-piece and easily ...

    • Modelling of Adaptive Geometry Flow Control Solutions in CFD 

      Vea, Anne (Master thesis, 2012)
      A synthetic jet is a flow control device which injects a pulsating jet flow of high-momentum fluid into a boundary layer near the wall confining a main flow. The technique is used to prevent or delay boundary layer separation. ...

    • Multi Stage Turbine for wave energy plant 

      Mong, Nina (Master thesis, 2007)
      A wave energy plant based on the patended Seawave Slot-Cone Generator (SSG) is under development by the Norwegian company WAVEenergy AS. The concept is based on the principle that the incoming waves will run uphill on a ...

    • Nytteverdien av å etablere pumpe i et eksisterende vannkraftsystem 

      Longva, Birgit (Master thesis, 2012)
      Hovedfokus for oppgaven er å analysere nytten av en pumpe som et tillegg til kraftverket som ble vurdert i prosjektoppgaven Alternative tekniske løsninger for utbygging av lavtrykks kraftverk . Kraftverket er plassert ved ...

    • 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 ...

    • Pressure oscillations during start and stop of a high head Francis turbine 

      Tørklep, Anders Mathias (Master thesis, 2012)
      Start and stop procedures affect pressure oscillations throughout a hydropower plant. A desire to study how pressure oscillations behave during these dynamic conditions was the basis of this report. Instrumentation, ...

    • Pressure pulsations and stress in a high head Francis model turbine 

      Hovland, Julie Marie (Master thesis, 2013)
      Model tests on a high head francis turbine has been conducted at the waterpower laboratory at NTNU. Simultaneous measurements of the pressure were performed on different parts of the waterway. Compact RIO hardware and ...

    • Pressure pulsations and stress in a high head turbine ? comparison between model and geometrically similar prototype. 

      Bue, Ingeborg Lassen (Master thesis, 2013)
      AbstractThe aim if this Master?s thesis was to establish relation between pressure pulsation amplitude in a model and a geometrical similar prototype. Model test has been conducted in the Water Power Laboratory at Norwegian ...

    • Prosjektering av måleutstyr og kompressor for luftputekammer 

      Laache, Lars (Master thesis, 2016)
      Sauland 2 er eit elvekraftverk under prosjektering. Kraftverket planlegger å nytte luftputekammer, og som elvekraftverk er kort nedetid ved fylling av kammeret essensielt for økonomien. Luftputekammer er viktig for å ...

    • Pump as Turbine - Symmetry Prediction Method for Pump as Turbine Characteristics 

      Albert, Øyvind (Master thesis, 2018)
      As a cheap and available source of renewable energy, regular centrifugal pumps may be run in reverse to act as hydro turbines. Pumps as turbines (PAT) are especially relevant for isolated rural areas, or in developing ...

    • Pump as Turbine - Symmetry Prediction Method for Pump as Turbine Characteristics 

      Skjoldli, Sondre (Master thesis, 2018)
      As a cheap and available source of renewable energy, regular centrifugal pumps may be run in reverse to act as hydro turbines. Pumps as turbines (PAT) are especially relevant for isolated rural areas, or in developing ...

    • Pumpe- og turbinkarakteristikker i fire kvadranter 

      Svarstad, Magni Fjørtoft (Master thesis, 2014)
      Reversible pumpeturbiner blir i økende grad brukt for å balansere kraftproduksjonen. Den økte bruken av reversible pumpeturbiner gjør også at det er nødvendig med bedre kjennskap til hvordan maskinen oppfører seg i uønskede ...

    • Pumpekraftverk for effektproduksjon 

      Øygard, Knut (Master thesis, 2008)
      Europa har et stadig økende energiforbruk, og har samtidig mål om å redusere bruken av fossile brensel. De termiske kraftverkene er trege å regulere, og et økende innslag av vindkraft forsterker en allerede vanskelig ...

    • Real Time Modelling of Flow Systems 

      Skodje, Sigrid Marie (Master thesis, 2013)
      Hydro power plants are operated in a different manner than what they used to be, due to increased focus on economy, and less on operating on best efficiency point. This creates new challenges related to wear and tear of ...

    • Sediment Erosion in Francis Turbines 

      Eltvik, Mette (Master thesis, 2009)
      The high concentration of sediments in the rivers near the Andes and the Himmalayas, is a large problems for run-of-river power plants. Small particles of quartz, which is a hard and sharp mineral, damage the turbine and ...

    • Separation Friendly Produced Water Pumps 

      Nocente, Alessandro (Doctoral thesis at NTNU;2016:263, Doctoral thesis, 2016)
      Produced water is the largest by-product of the oil and gas industry and its handling represents an important challenge. The fluid is mainly constituted by water, but its high content of sand, salt, sediments and especially ...

    • 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 the natural frequencies in a pump-turbine runner in air and water 

      Fjeld, Øyvind Moen (Master thesis, 2015)
      Structural-acoustic models are used in the industry to determine the natural frequencies of runners and impellers in hydraulic turbomachinery under construction of the machines. The structural-acoustic models have to be ...

    • Simulation Program for Stability Analysis of Hydropower Plants 

      Vogt-Svendsen, Simen Nordre (Master thesis, 2012)
      Over the last few years Norway has seen an increasing number of hours where the grid frequency exceeds the required limits (49.9-50.1Hz). To improve this situation one alternative is to implement hydropower governing with ...