Blar i Institutt for energi og prosessteknikk på emneord "Energi og miljø, Strømningsteknikk"
Viser treff 21-40 av 47
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Investigation of on-set of trailing edge cavitation in a Francis runner - Undersøkelse av dannelse av kavitasjon på avløpskanten til et Francis løpehjul
(Master thesis, 2018)Numerical simulations has been run on the Francis99 model runner at full load and deep part load conditions. Simulations has also been performed on plant Thoma number for for varying discharge. The simulations were performed ... -
Investigation of unsteady flow in the vaneless gap between impeller and diffusor.
(Master thesis, 2016)I denne oppgaven er det undersøkt hvorvidt vibrasjoner i en vertikalsentrifugalpumpe stammer fra sekundærstrømninger i gapet mellom impellerog diffusor. En model av dette gapet ble laget ut fra arbeidstegninger overpumpen ... -
Måling av egenfrekvenser til sirkulær disk i luft og vann
(Master thesis, 2015)I denne oppgaven har egenfrekvensene til en sirkulær plate og en reversibel pumpeturbin blitt utforsket. Det har blitt testet hvordan de endrer seg i vann med fokus på hvordan avstanden til en stiv overflate påvirker ... -
Numerical Investigation of Flow Field subject to Vibrating Structure
(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 ... -
Numerisk simulering av strømning rundt vingeprofil NREL S826 ved moderate Reynoldstall ved hjelp av løsnet vivel simulering (DES)
(Master thesis, 2016)In this study computational fluid dynamics (CFD) was used to simulate the flow around the asymmetric NREL S826 airfoil. ANSYS Fluent v.16.2 was used as the CFD solver, while ANSYS Meshing was used for creating the grids. The ... -
Patient specific numerical simulation of flow in the human upper airways
(Master thesis, 2016)In this master thesis, a patient specific computational fluid dynamics (CFD) \nomenclature{CFD}{Computational Fluid Dynamics} study has been done on the air flow in the human upper airways before and after surgical ... -
Pelton Turbine - Model Test of a Runner
(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 ... -
Performance and wake measurements of a Savonius wind turbine
(Master thesis, 2018)In this study, the performance, drag and wake characteristics of a vertical axis Savonius wind turbine are investigated experimentally. The turbine is drag driven and has a helical configuration, making the top rotated 180 ... -
Preprosessering av meteorologiske data for atmosfæriske teoretisk/numeriske modeller
(Master thesis, 2015)In order to investigate vertical wind profiles and deviations with respect to atmospheric stability in maritime environment a case study at the Skipheia measurement site on Frøya is presented. In this study, vertical wind ... -
Pressure pulsations and thermodynamic efficiency measurements at Smeland power plant
(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 ... -
Pump as Turbine - Symmetry Prediction Method for Pump as Turbine Characteristics
(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
(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 ... -
Simulation and analysis of FCR operation of a Francis turbine
(Master thesis, 2017)In the Nordic power system, the frequency quality has decreased significantly over the years. One of the reasons for this is a superimposed periodic frequency oscillation with a time period of around 40-90 seconds, which ... -
Simulation of hydraulic transients of operation at two hydro power plants
(Master thesis, 2016)The energy production in Europe is heading towards a green shift. The energy produced be renewable sources such as solar and wind are increasing day by day. This does however lead to a few issues. The energy produced by ... -
Simulation of pre-rotation in the flow at the inlet of a Reversible Pump Turbine
(Master thesis, 2018)In this master thesis, CFD simulations of an imposed pre-rotation in the flow at the inlet of a reversible pump turbine (RPT) were carried out in ANSYS CFX. The simulations were conducted on the RPT model designed by ... -
Simulation of the natural frequencies in a pump-turbine runner in air and water
(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 ... -
Study of sediment erosion in guide vanes of Francis turbine
(Master thesis, 2016)The Himalayas and the Andes mountains are regions with some of the worlds biggest hydropower potential. One of the biggest problems facing the development of these resources are high concentrations of hard minerals in the ... -
Study of wind turbine wake aerodynamics through the application of motion tracking techniques
(Master thesis, 2016)In this master thesis an optical tracking system used to evaluate the 3D motion of an object in space has been studied. The aim of the study was to reconstruct the path of a rotating plank, and evaluate the accuracy of ... -
Study of wind turbine wake aerodynamics through vortex flow visualization
(Master thesis, 2017)In this master thesis, a flow visualization experiment and a blade tracking experiment have been conducted. The aim of the thesis has been to assess the performance of the new blade tow tank rig at the Fluid Mechanics Lab ... -
Svingekammer eller luftputekammere i vannkraftverk
(Master thesis, 2015)Hensikten med oppgaven er å finne en optimal løsning for Sauland kraftverk med tanke på systemdynamikk og stabilitet. Dette innebærer blant annet å sammenligne en luftputeløsning og en svingekammerløsning for hvert av de ...