Search for dissertations about: "annular flow"

Showing result 6 - 10 of 43 swedish dissertations containing the words annular flow.

  2. 6. Direct numerical simulation of turbulent flow in plane and cylindrical geometries

    Author : Jukka Komminaho; KTH; []
    Keywords : turbulence; plane Couette flow; pipe flow; laminar-turbulent transition; direct numerical simulation; spectral methods;

    Abstract : This thesis deals with numerical simulation of turbulentflows in geometrically simple cases. Both plane and cylindricalgeometries are used. The simplicity of the geometry allows theuse of spectral methods which yield a very high accuracy usingrelatively few grid points. A spectral method for planegeometries is implemented on a parallel computer. READ MORE

  4. 7. Experimental investigation of nozzle guide vanes in a sector of an annular cascade

    Author : Julien Roux; KTH; []
    Keywords : Turbomachinery; annular cascade test facilities; steady state; pressure measurements; aerodynamic probe calibration; coolant concentration; film cooling; secondary flow; kinetic energy losses;

    Abstract : .... READ MORE

  5. 8. Experimental Investigation of Velocity Gust in High Pressure Turbines

    Author : Kai Freudenreich; KTH; []
    Keywords : turbomachinery; unsteady aerodynamics; gust; forcing function; forced response; transonic flow; annular cascade; Laser-Two-Focus Anemometer; experiments;

    Abstract : This thesis investigates the unsteady three-dimensional gustfield in high subsonic and transonic turbine stages based onexperimental velocity data. The generation, propagation andinteraction mechanisms of the velocity gust in high pressureturbines are studied. READ MORE

  6. 9. Experimental investigation of gas turbine airfoil aerodynamic performance without and with film cooling in an annular sector cascade

    Author : Sven-Henrik Wiers; KTH; []
    Keywords : turbomachinery; linear and annular cascade test facilities; steady state; flow wisualizaiton; prossure measurement;

    Abstract : .... READ MORE

  7. 10. Microfluidic Hydrodynamic of Gas-Liquid flow in Single Microchannel and Porous Media with Microchannel Network

    Author : Shuo Yang; NanoLund: Centre for Nanoscience; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mass transfer; slug flow; porous media; interficial instability; fingering displacement;

    Abstract : In this thesis, a microfluidics platform with high-speed imaging system was built to investigate gas-liquid flow in single microchannel and interfacial instability in porous media with microchannel network:The mass transfer of slug flow in the rectangular and square microchannels was experimentally studied by using water as liquid phase and CO2 as gas phase. Depending on flow rates, flow patterns including slug flow, bubbly flow, and annular flow were observed in rectangular and square microchannels. READ MORE