Sökning: "Wind tunnels"

Visar resultat 16 - 18 av 18 avhandlingar innehållade orden Wind tunnels.

1. 16. Effects of free-stream turbulence and three-dimensional roughness on boundary layer transition

   Författare :Santhosh Babu Mamidala; Jens H. M. Fransson; Bengt E. G. Fallenius; Jonathan Morrison; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; boundary-layer transition; intermittency; free-stream turbulence; electret microphones; isolated roughness; sinuous instability; varicose instability; Engineering Mechanics; Teknisk mekanik;

   Sammanfattning : External disturbances such as free-stream turbulence (FST), and isolated three-dimensional roughness are strong disturbance sources to the laminar boundary layers (BLs), which can lead to a rapid transition to turbulence. The transition process eventuates to increase in skin-friction coefficient and heat transfer rate and hence, both of the aforementioned disturbance sources have practical importance. LÄS MER

3. 17. Emissions, dynamics and dispersion of particles in polluted air

   Författare :Lars Gidhagen; Hans-Christen Hansson; Christer Johansson; Joakim Langner; Øystein Hov; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Meteorology; Meteorologi;

   Sammanfattning : The main objective of this thesis is to yield information on how atmospheric fine and ultrafine particles are dispersed in populated areas. Quantitative information on emissions, transport and removal is needed to assess the health risks of inhalable particles. LÄS MER

4. 18. Investigation of boundary layer transition for transonic flow over compressor and turbine airfoils

   Författare :Susanne Svensdotter; KTH; []
   Nyckelord :;

   Sammanfattning : This thesis considers the laminar-turbulent transition overcompressor and turbine airfoils at high subsonic and transonicflow conditions.First, experiments on the laminar-turbulent transition on anisolated airfoil in high subsonic and transonic flow wereperformed. LÄS MER