Search for dissertations about: "Wind tunnels"

Showing result 1 - 5 of 17 swedish dissertations containing the words Wind tunnels.

  2. 1. Vehicle wakes in side wind

    Author : Magnus Urquhart; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; surrogate model; optimization; CFD; wind; crossflow; drag; yaw; cavity; wake; tomographic PIV; aerodynamics;

    Abstract : There is a global push to reduce the energy consumption of passenger vehicles with increasingly stringent targets and regulations. More than one-tenth of Europe's greenhouse gasses are due to passenger vehicles. The aerodynamic drag is a major contributor to energy consumption responsible for more than a quarter of the vehicle's energy usage. READ MORE

  4. 2. Wind-turbine wake flows - Effects of boundary layers and periodic disturbances

    Author : Ylva Odemark; Jens Fransson; Per-Åge Krogstad; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wind power; wind-turbine model; wind tunnel; porous disc; hot-wire anemometry; particle image velocimetry; blade element momentum method; large eddy simulations; actuator disc method;

    Abstract : The increased fatigue loads and decreased power output of a wind turbine placed in the wake of another turbine is a well-known problem when building new wind-power farms and a subject of intensive research. These problems are caused by the velocity gradients and high turbulence levels present in the wake of a turbine. READ MORE

  5. 3. Development of guide-vanes for expanding corners with application in wind-tunnel design

    Author : Björn Lindgren; KTH; []
    Keywords : Wind tunnels;

    Abstract : .... READ MORE

  6. 4. Aerodynamic Studies of Vertical Axis Wind Turbines using the Actuator Line Model

    Author : Victor Mendoza; Anders Goude; Hans Bernhoff; Robert Flemming Mikkelsen; Uppsala universitet; []
    Keywords : wind power; vertical axis wind turbines VAWTs ; actuator line model ALM ; dynamic stall model DSM ; atmospheric boundary layer ABL ; wake deflection; atmospheric boundary layer ABL ; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Abstract : This thesis addresses the unsteady aerodynamics involved in the operation of vertical axis wind turbines (VAWTs). The main focus is to represent and understand the most relevant phenomena within the resulting flow pattern as the wake structure, loads on the different turbine components and the performance of the rotor. READ MORE

  7. 5. Flow facility design and experimental studies of wall-bounded turbulent shear-flows

    Author : Björn Lindgren; KTH; []
    Keywords : fluid mechanics; wind.tunnels; asymmetric diffuser; turbulent boundary layer; flow structures;

    Abstract : The presen present thesis spans a range of topics within thearea of turbulent flows, ranging from design of flow facilitiesto evaluation aluation of scaling laws and turbulence modelingdeling aspects through use of experimental data. A newwind-tunnel has been designed, constructed and evaluated at theDept. of Mechanics, KTH. READ MORE