Blar i NTNU Open på forfatter "Krogstad, Per-Åge"

Viser treff 1-20 av 21

    • Aerodynamic Optimisation of Airfoils and Winglets for Wind Turbine Application 

      Hansen, Thomas (Doctoral theses at NTNU;2017:263, Doctoral thesis, 2017)
      The presented thesis summarises work on applying evolutionary optimisation algorithms for the design of airfoils and winglets for wind turbine application. This approach is more computationally expensive than using traditional ...

    • Blade Dynamic Response for Downwind Turbines 

      Salthaug, Marie (Master thesis, 2011)
      A MATLAB script has been developed to investigate dynamics in the blades of a 10 MW downstream wind turbine, with both a tubular- and a truss tower. The classical Beam element momentum method with additional correction ...

    • CFD Modeling of a Wingsuit 

      Omholt, Siri (Master thesis, 2011)
      An experienced wingsuit pilot may be able to cover a horizontal distance up to three meters for each meter of vertical fall in steady flight. Such a glide ratio of 3:1 is dramatically much better than can be achieved by ...

    • Design av bladprofil for en stor ventilator 

      Hjetland, Even (Master thesis, 2009)
      Institutt for Energi- og Prosessteknikk ved NTNU gikk, for en tid tilbake, til innkjøp av en fullskala ventilator av typen som Vegdirektoratet i Norge benytter til ventilering i tunneler. Motivasjonen bak innkjøpet var et ...

    • Design of Airfoil for downwind wind turbine Rotor 

      Sæta, Eivind (Master thesis, 2009)
      This thesis is on the design of an airfoil for a downwind wind turbine rotor with thin flexible wings, for offshore floating conditions. It has been suggested that such a system would to be lighter, simpler and allow for ...

    • Effect of free stream turbulence on wind turbine performance 

      Mikkelsen, Kristine (Master thesis, 2013)
      In this Master Thesis the effect of free stream turbulence has been investigated on a model wind turbine's performance characteristics and the wake development downstream. The experiment took place in the recirculating ...

    • Effekt av overflateruhet på diffusorstrømning 

      Midtgård, Roy-Andre (Master thesis, 2011)
      Effekt av overflateruhet på diffusorstrømningMasteroppgave av Roy-Andre Midtgård, med veileder professor Per-Åge Krogstad.Formålet med dette prosjektet er å studere effekten av overflateruhet på et turbulent grensesjikt ...

    • Flight path optimization for an airplane 

      Merle, Dorothée (Master thesis, 2011)
      The diminution of the fuel consumption during the flight trajectory has an impact on the cost of the travel and answers to the ecologic challenge Green Sky . The analysis has for objective to optimize the flight trajectory ...

    • Front Wing Interactions on a Racecar 

      Kvålseth, Andreas Ljosland (Master thesis, 2014)
      A multi-element front wing of a formula student car was analyzed using the Computational Fluid Dynamics (CFD) software STAR-CCM+. A number of cases were simulated in steady state to get an understanding of the interaction ...

    • Influence on wind shear and turbulence in flow over obstacles 

      Guldsten, Jon Didriksen (Master thesis, 2010)
      A wind tunnel study of speed-up effects above the very crest of a sharp-edged escarpment and a hill peak in a simulated atmospheric boundary layer has been carried out. It was desired to do a part-deep simulation of an ...

    • Numerical Study of the Interaction of Flow over Two Airfoils in Relative Motion 

      Tveiterås, Vebjørn (Master thesis, 2011)
      Computational fluid dynamics (CFD) was be used to investigate aspects of interaction of flow over two airfoils in relatie motion in detail.%Problem statement2D tandem airfoil setups were studied, where the leading airfoil ...

    • Performance and wake development behind two in-line and offset model wind turbines - "Blind test" experiments and calculations 

      Sætran, Lars Roar; Krogstad, Per-Åge; Adaramola, Muyiwa S. (Journal article; Peer reviewed, 2014)
      This is a report on data presented at the ”Blind test 3” Workshop organized jointly by Nowitech and Norcowe in Bergen, December 2013. A number of research groups were invited to predict the performances and the wake ...

    • Performance Calculations for a Model Turbine 

      Karlsen, John Amund (Master thesis, 2009)
      En modell av en vindturbin er studert numerisk og eksperimentelt. Dette er gjort for å verifisere at modellen fungerer i henhold til de beregninger som ble lagt til grunn i designprosessen. Vindturbinen har en diameter på ...

    • Rotor wake turbulence: An experimental study of a wind turbine wake 

      Eriksen, Pål Egil (Doctoral thesis at NTNU;2016:34, Doctoral thesis, 2016)
      An experimental investigation of the first five diameters of the wake of a 0.9 meter in diameter model wind turbine with three blades has been undertaken. The blades are twisted and tapered and uses a NREL S826 ...

    • Simulering av strømning i en diffusor med ruhet på en vegg 

      Nytun, Magnus (Master thesis, 2014)
      SammendragDenne masteroppgaven har tatt for seg beregninger av en spesiell diffusor geometri som er utviklet ved institutt for energi og prosessteknikk ved Norges teknisk-naturvitenskaplige universitet. Denne diffusor ...

    • Three-dimensional wake measurements 

      Eriksen, Pål Egil (Master thesis, 2010)
      The performance of a hot wire probe with three wires is investigated for two different flow cases. The wires are made of a platinum/rhodium alloy, and has a diameter of 5 micrometer. The three wires make a probe volume ...

    • Wake behind a horizontal-axis wind turbine 

      Nygard, Øyvind Vik (Master thesis, 2011)
      In this paper theory on cylinder and wind turbine wakes have been studied, and experimental work on the wake behind a wind turbine have been carried out in the Fluids engineering laboratory at NTNU.The objective of this ...

    • Wake behind a wind turbine operating in yaw 

      Andresen, Birgitte (Master thesis, 2013)
      The object of this study is primarily to understand the behavior of the wake behind a yawed turbine, and if yaw can be a method for actively controlling the direction of the wake, and thereby controlling the power output ...

    • Wind Turbine in Yawed Operation 

      Loland, Kari Medby (Master thesis, 2011)
      The task of this project was to investigate the near wake, performance characteristics and yaw moment on a model wind turbine. The test turbine is a horizontal axis three bladed machine with a rotor diameter of 0.9 meter. ...

    • Wind turbine wake meandering 

      Lynum, Susanne (Master thesis, 2013)
      In this master thesis the meandering of the wake of a three bladed horizontal axis model wind turbine has been studied. Measurements have been conducted by the use of four hot-wire probes located at multiple nearby points ...