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Pressure measurements inside a Francis turbine runner
(Master thesis, 2016)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 combination of these. In this paper, ... -
Pressure oscillations during start and stop of a high head Francis turbine
(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 Perpendicular to the Grain in Wooden Sills: Numerical Studies of Softening and Failure in Abaqus
(Master thesis, 2012)Joints with pressure perpendicular to the grain are a common occurrence in wooden structures. While the making of such a joint is very simple, dimensioning it is difficult: The load configuration causes a mix of ductile ... -
Pressure Pulsation and Stresses in a Francis Turbine Operating at Variable Speed
(Master thesis, 2018)The introduction of new intermittent energy sources on the electrical grid increases the need of regulated power to ensure stability of grid frequency. Hydropower has the unique possibility to deliver both stability and ... -
Pressure Pulsations and Fatigue Loads in High Head Francis Turbines
(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 stress in a high head Francis model turbine
(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.
(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 ... -
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 ... -
Pressure pulsations at Iveland Power Plant
(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 ... -
Pressure Retarded Osmosis and Forward Osmosis Membranes: Materials and Methods
(Journal article; Peer reviewed, 2013)In the past four decades, membrane development has occurred based on the demand in pressure driven processes. However, in the last decade, the interest in osmotically driven processes, such as forward osmosis (FO) and ... -
Pressure swing adsorption for coproduction of power and ultrapure H2 in an IGCC plant with CO2 capture
(Journal article, 2016)The coproduction of power and ultrapure H2 within an Integrated Gasification Combined Cycle (IGCC) plant implementing CO2 capture offers advantages in terms of flexible operation while retaining good efficiency. The common ... -
Pressure Tolerant Power Electronics
(Master thesis, 2009)The thermal behaviour of an IGBT module was investigated, especially with respect to the module being immersed in dielectric oil. An equivalent thermal model was built using thermal transients and network synthesis. The ... -
Pressure Transient Analysis Using Generated Well Test Data from Simulation of Selected Wells in Norne Field
(Master thesis, 2012)Several types of transient well testing in Norne field are presented in this thesis. One production well from each segment in Norne field was participated in different type of test. The well test data of all cases were ... -
Pressure wave propagation in Managed Pressure Drilling- model comparison with real life data
(Journal article; Peer reviewed, 2019)Drilling for oil and gas is a complex process, involving pumping of fluid through kilometers of pipes. Even though the drilling fluid has a high speed of sound (˜1000 m/s), the large lengths involved make pressure wave ... -
Pressure Waves in Pipelines and Impulse Pumping: Physical Principles, Model Development and Numerical Simulation
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:19, Doctoral thesis, 2010)The primary purpose of the work was to describe the physical principles of impulse pumping and investigate its potential applications in petroleum engineering. Investigations of the potential applications of impulse pumping ... -
Pressure-dependent plasticity models with convex yield loci for explicit ice crushing simulations
(Peer reviewed; Journal article, 2022)Despite the viscous behaviour of crushed ice, plasticity models have been widely used for numerical modelling of ‘design-ice’ in damage assessment applications for several reasons outlined herein. The Crushable Foam (CF) ... -
Pressure-induced 0-π transitions and supercurrent crossover in antiferromagnetic weak links
(Journal article, 2013)We compute self-consistently the Josephson current in a superconductor-antiferromagnet-superconductor junction using a lattice model, focusing on 0−π transitions occurring when the width of the antiferromagnetic region ... -
Pressures Inside a Nano-Porous Medium. The Case of a Single Phase Fluid
(Journal article; Peer reviewed, 2019)We define the pressure of a porous medium in terms of the grand potential and compute its value in a nano-confined or nano-porous medium, meaning a medium where thermodynamic equations need be adjusted for smallness. On ... -
Pressures inside a nano-porous medium. The case of a single phase fluid
(Research report, 2018)We define the pressure of a porous medium in terms of the grand potential, and compute its value in a nano-confined or nano-porous medium, meaning a medium where thermodynamic equations need be adjusted for smallness. On ... -
A pressurized Internally Circulating Reactor (ICR) for streamlining development of chemical looping technology
(Doctoral theses at NTNU;2021:223, Doctoral thesis, 2021)Carbon Capture, Utilization and Storage (CCUS) considered playing a major role in most mitigation scenarios to meet the ambitions of Paris agreement in limiting future temperature increases to 2°C. Chemical looping process ...