Sökning: "turbulence intensity"

Visar resultat 1 - 5 av 43 uppsatser innehållade orden turbulence intensity.

1. 1. Computational Fluid Dynamics of the flow in a diffuser : - like geometry

   Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

   Författare :Rasmus Johansson Oskarsson; [2023]
   Nyckelord :Fluid mechanics; Flow simulation; RANS; Flow separation; Diffuser;

   Sammanfattning : Simulations were performed to investigate flow separation of an asymmetricdiffuser - like geometry. The geometry used for the simulations was modeledafter an experimental setup with recorded flow data, which was compared tothe simulated data. For all simulations, steady state flow at the inlet was usedwith the assumption of a 2D flow. LÄS MER

3. 2. Uncertainty quantification for offshore wind turbines

   Master-uppsats, KTH/Matematik (Avd.)

   Författare :Ziming Wang; [2022]
   Nyckelord :wind energy; uncertainty propagation; polynomial chaos; Rosenblatt transformation; quadrature; regression; vindenergi; osäkerhetsutbredning; polynomkaos; Rosenblatt transformation; kvadratur; regression;

   Sammanfattning : Wind energy is a field with a large number of uncertainties. The random nature of the weather conditions, including wind speed, wind direction, and turbulence intensity, influences the energy output and the structural safety of a wind farm, making its performance fluctuate and difficult to predict. LÄS MER

4. 3. Turbulence Intensity Measurements in a High-Pressure Gas Turbine Stage

   Master-uppsats, KTH/Kraft- och värmeteknologi

   Författare :Ettore Scami; [2022]
   Nyckelord :Turbulence Intensity; turbine; stage efficiency; grid; turbomachinery; length scales;

   Sammanfattning : This Thesis work focused on the acquisition and evaluation of data on mean velocity, turbulence intensity and length scales obtained via hot wire measurements in a high pressure single-stage land-based turbine available at the Department of Heat and Power Technology in KTH. Turbulence was generated by the use of grids and twoprobes, upstream and downstream of the turbine stage, were used. LÄS MER

5. 4. Wind Power Development in Economical Forest in Lower Saxony, Germany - Mapping Challenges and Opportunities using a Constellation Analysis

   Magister-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Esther Sophia Rust; [2022]
   Nyckelord :wind power; forest; Germany; local value; distributive justice; procedural justice; nature compatibility;

   Sammanfattning : Forests provide ecosystem services, whereby near-natural forests offer mainly cultural as well as regulating services, and economical forests offer mainly provisional services. Even though wind resources above forests show a strong wind shear and veer as well as high turbulence intensity, the development of tall and low-wind-speed-adapted turbines led to the feasibility of wind power development in economical forests, adding a new land use. LÄS MER

7. 5. CFD Based External Heat Transfer Coefficient Predictions on a Transonic Film-Cooled Gas Turbine Guide Vane : A Computational Fluid Dynamics Study on the Von Karman Institute LS94 Test Case

   Master-uppsats, Linköpings universitet/Mekanisk värmeteori och strömningslära

   Författare :Rosalie Johnsson; Lilian Asiegbu; [2022]
   Nyckelord :gas turbine; turbine inlet guide vane; film-cool; film cool; Computational Fluid Dynamics; CFD; heat transfer coefficient; Shear Stress Transport k-ω; SST k-ω; Scale Resolving Hybrid; SRH; turbulence modelling;

   Sammanfattning : The turbine inlet guide vanes of a gas-turbine are subjected to extreme hot gas temperatures which increases the risk of mechanical failure and overall reduces the component lifespan. Hence, it is of great interest for gas-turbine manufacturers to establish methods for accurately estimating the temperature distribution along the vane surface. LÄS MER