Sökning: "rotor dynamics"

Visar resultat 6 - 10 av 50 uppsatser innehållade orden rotor dynamics.

1. 6. Load Control Aerodynamics in Offshore Wind Turbines

   Master-uppsats, KTH/Kraft- och värmeteknologi

   Författare :Lorenzo Cantoni; [2021]
   Nyckelord :Wind Turbine; Offshore; Blade; Rotor; Computational Fluid Dynamics; Airfoil; Aerodynamic; Aeroelasticity; Simulation; Fluid; Structure; Interaction; Loads; Control; Response; Harmonics; Vibration; Damping; Flutter; Trailing Edge; Flaps; Wind Gust; Lift; Drag; Unsteady; Pressure; Velocity; Vindkraftverk; offshore; blad; rotor; beräkningsvätske-dynamik; flygplatta; aerodynamisk; aeroelasticitet; simulering; vätska; struktur; interaktion; belastningar; kontroll; respons; övertoner; vibrationer; dämpning; fladdring; bakkant; klaffar; vindstöt; lyft; Drag; ostadig; tryck; hastighet;

   Sammanfattning : Due to the increase of rotor size in horizontal axis wind turbine (HAWT) during the past 25 years in order to achieve higher power output, all wind turbine components and blades in particular, have to withstand higher structural loads. This upscalingproblem could be solved by applying technologies capable of reducing aerodynamic loads the rotor has to withstand, either with passive or active control solutions. LÄS MER

3. 7. Predict Flow Field and Mixing Time for High-Shear Mixers Using CFD

   Master-uppsats, Lunds universitet/Institutionen för energivetenskaper

   Författare :David Fransson; Eric Kihlman; [2021]
   Nyckelord :CFD; High-Shear Mixer; Energy Science; Simulation; Mixing time; blend time; Flow Field; Technology and Engineering;

   Sammanfattning : Batch high-shear mixers are used in a variety of different processing industries,such as the pharmaceutical, chemical and food industries. One company that utilize this type of mixers is Tetra Pak. High-shear mixers can be used for many different mixing scenarios, but only liquid-liquid mixing is discussed in the thesis. LÄS MER

4. 8. Experimental Investigation of Fluid-added Parameters on a Kaplan Runner

   Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

   Författare :Malin Strandberg; [2021]
   Nyckelord :Added mass; added inertia; fluid dynamics; hydropower; Kaplan turbine; fluid-solid interaction;

   Sammanfattning : In order to reach climate and environmental goals, Sweden is increasing the implementation of intermittent renewable energy sources such as wind and solar power to the electricity grid. The increase of intermittent energy sources is rising power regulation requirement towards hydropower, which increasingly exposes the hydraulic turbines to high loads and fluctuating hydraulic forces. LÄS MER

5. 9. Performance analysis of a small-scalewind turbine at variable pitch and withpitch unbalance

   Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

   Författare :Francesco Mazzeo; [2021]
   Nyckelord :Wind energy; wind turbine; pitch angle; pitch unbalance; Blade Element Momentum BEM theory; Computational Fluid Dynamics CFD ; wind tunnel experiments; oscillations;

   Sammanfattning : When it comes to design a wind turbine rotor, several parameters have to be taken into account. The present work focuses on the inclination of the blades with respect to the rotor plane, namely the pich angle. LÄS MER

7. 10. Effects of load modelling on Voltage Impasse Regions (VIR)

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Maria Angeles Antolin Linan; [2019]
   Nyckelord :load models; power system dynamics; quasi-dynamic approach; voltage collapse; Voltage Impasse Regions VIR ; lastmodeller; kraftsystemdynamik; kvasi-dynamisk tillvägagångssätt; spänningskollaps; Voltage Impasse Region VIR ;

   Sammanfattning : Voltage Impasse Region (VIR) is a phenomenon in power systemswhose dynamics are describe by a set of Differential AlgebraicEquations (DAE). VIR denotes a state-space area where voltagecausality is lost, i.e. the Jacobian of the algebraic part of DAEis singular. LÄS MER