Blar i NTNU Open på forfatter "Solemslie, Bjørn Winther"

Viser treff 21-39 av 39

    • Numerical investigation of a Pelton turbine at several operating conditions 

      Gautam, Saroj; Chitrakar, Sailesh; Neopane, Hari Prasad; Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2022)
      The use of Computational Fluid Dynamics (CFD) for predicting the flow behaviour in Pelton turbines is limited by the complex nature of the flow, interaction between the jets and interference of the water after the impact ...

    • 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 ...

    • Pressure Pulsations and Fatigue Loads in High Head Francis Turbines 

      Solemslie, Bjørn Winther; Trivedi, Chirag; Agnalt, Einar; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2019)
      The Norwegian power system today includes a relatively large percentage of Francis turbines with a head of above 300m, in the world. This leads to a need to maintain and develop the national competence regarding the ...

    • Pressure pulsations and thermodynamic efficiency measurements at Smeland power plant 

      Kverno, Johannes Opedal; Ulvan, Vegard Selvåg (Master thesis, 2018)
      In this master thesis, the cause and solution of a problem at Smeland power plant have been thoroughly investigated. The power plant has for years experienced severe pressure pulsations in their Francis turbine at full ...

    • Pressure pulsations at Iveland Power Plant 

      Røneid, Erlend (Master thesis, 2020)
      Energimarkedet går over til meir fornybare energikjelder. Vasskraft, kjent for sin høge effektivitet, pålitelegheit og overlegne reguleringsemne samanlikna med andre fornybare energikjelder, har ein viktig rolle i denne ...

    • Review on erosion phenomenon, maintenance, and financial calculation of lifetime as an asset for Pelton turbines 

      Abregu Ochoa, Jim Furcio; Acharya, Nirmal; Solemslie, Bjørn Winther (Peer reviewed; Journal article, 2023)
      Prevention of greenhouse emissionsis the top priority for all countries, which urges them to switch to renewable energy as much as possible. Hydropower is one of the renewables that have high flexibility and at the same ...

    • Review on numerical techniques applied in impulse hydro turbines 

      Chitrakar, Sailesh; Solemslie, Bjørn Winther; Neopane, Hari Prasad; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2020)
      Impulse turbines are widely used in hydropower plants around the world due to their high efficiency in a larger operating range compared to reaction turbines. State of the art Pelton turbines can give over 90% efficiency ...

    • The Rotor-Stator Interaction Onboard a Low Specific speed Francis Turbine 

      Agnalt, Einar; Solemslie, Bjørn Winther; Storli, Pål-Tore Selbo; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2020)
      Over the last years, several breakdowns in hydropower plants with low specific speed Francis runners have been reported. One of the main excitation forces in such runners is the pressure fluctuations originating from the ...

    • Signature investigation of typical faults on a Francis turbine 

      Støren, Gine Kirkebøen (Master thesis, 2021)
      En økende mengde ikke-regulerbare energikilder på strømnettet og høy priskonkurranse på elektrisitet, har ført til endrede driftsstrategier for vannkraftverk de siste årene. Vannturbiner opereres i større grad utenfor deres ...

    • Signature Investigation of Typical Faults on Francis Turbines 

      Støren, Gine Kirkebøen; Dahlhaug, Ole Gunnar; Solemslie, Bjørn Winther (Peer reviewed; Journal article, 2020)
      Hydropower is facing new operational strategies as the increasingly competitive power market demands for higher flexibility. Consequently, turbines are forced to handle tougher operation and are prone to more frequent ...

    • Test of a centrifugal pump 

      Heggset, Rakel Sæter (Master thesis, 2020)
      I dette prosjektet har en sentrifugalpumpe for elektriske motorer blitt undersøkt. En rask progresjon innen batteriteknologi og elektrisk utstyr de siste årene, har gjort det mulig å erstatte de mer tradisjonelle ...

    • Test of a Francis turbine with variable speed operation 

      Langleite, Gro Mari Kjellstadli (Master thesis, 2020)
      I disse dager med utfordringer knyttet til frekvens responsen på nettet, kan Francis turbiner ha mulighet til å tilføre mer intermitterende energi på nettet. Dessverre kan løpehjulet oppleve utmatning eller sprekke grunnet ...

    • Testrigg for Peltonturbinmodeller ved Vannkraftlaboratoriet 

      Reinertsen, Kyrre (Master thesis, 2012)
      Vannkraftlaboratoriet ønsker å bygge en testrigg for peltonturbiner som tilfredstiller kravene til IEC 60193. Den eksisterende riggen må oppgraderes og det må implementeres mulighet for måling av friksjonsmomentet. I denne ...

    • TwinLab - Digital Twin Laboratory for Hydropower 

      Skjelbred, Hans Ivar; Fjelldal, Bjørnar; Solemslie, Bjørn Winther; Vilberg, Ingrid (HydroCen Rapport;27, Research report, 2022)
      This report summarizes the results from the TwinLab project in 2021. The project was funded by HydroCen OpenCalls and is a multidisciplinary project with partners from all work packages in HydroCen.