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Showing result 1 - 5 of 23 swedish dissertations matching the above criteria.

  2. 1. Wind turbine wakes : controland vortex shedding

    Author : Davide Medici; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wind Energy; Power Optimisation; Active Control; Yaw; Vortex; Mechanical energy engineering; Mekanisk energiteknik;

    Abstract : Wind tunnel studies of the wake behind a model wind turbine have been made in order to get a better understanding of wake development as well as the possibility to predict the power output from downstream turbines working in the wake of an upstream one. Both two-component hot-wire anemometry as well as particle image velocimetry (PIV) have been used to map the flow field. READ MORE

  4. 2. On the three-dimensionality of vortex shedding from a circular cylinder

    Author : Stefan Szepessy; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; vortex wake; three-dimensional effects; spanwise correlation; Strouhal number; circular cylinder; fluid dynamics; bluff body; vortex shedding; Kármán vortex street; end plates;

    Abstract : .... READ MORE

  5. 3. Numerical Study of Fluid-Structure Interaction with Application to Oscillating Cylinders

    Author : Mikhail Lazarkov; Strömningsteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; lock-in.; Thermal engineering; applied thermodynamics; Termisk teknik; termodynamik; synchronization; flow-induced vibration; LES; Volume of Solid method; Virtual Boundary method; vortex-shedding; confined cylinder; Fluid-structure interaction; wake;

    Abstract : The problem of fluid-structure interaction, occurring in many industrial and engineering applications, are of great importance, since interaction of a flow and a structure in it can lead to serious damages of the structure. The fluid-structure interaction gives rise to a variety of different physical phenomena such as flow-induced vibration, noise generation, etc. READ MORE

  6. 4. Experimental studies of wind turbine wakes : power optimisation and meandering

    Author : Davide Medici; Henrik Alfredsson; Martin O.L. Lansen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wind energy; power optimisation; active control; yaw; vortex shedding; wake meandering; Fluid mechanics; Strömningsmekanik;

    Abstract : Wind tunnel studies of the wake behind model wind turbines with one, two and three blades have been made in order to get a better understanding of wake development as well as the possibility to predict the power output from downstream turbines working in the wake of an upstream one. Both two-component hot-wire anemometry and particle image velocimetry (PIV) have been used to map the flow field downstream as well as upstream the turbine. READ MORE

  7. 5. Dynamics of Exhaust Valve Flows and Confined Bluff Body Vortex Shedding

    Author : Marcus Winroth; P. Henrik Alfredsson; Knud Erik Meyer; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Mechanics; Teknisk mekanik;

    Abstract : This thesis can be divided into two interconnected topics; engine exhaust-valve flows and confined bluff-body vortex shedding. When optimising engine flow systems it is common to use low order simulation tools that require empirical inputs, for instance with respect to flow losses across the exhaust valves. READ MORE