Sökning: "wake effect"

Visar resultat 1 - 5 av 64 avhandlingar innehållade orden wake effect.

  1. 1. Analysis of the Base Wake on Passenger Vehicles

    Författare :Lennert Sterken; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Pressure measurements; External aerodynamics; Wind tunnel; Wake; Local drag; CFD;

    Sammanfattning : Car manufacturers are presented by a continuous increase in fuel prices and by ever more strict legislations regarding CO2-emissions. Decreasing the driving resistance and hence the fuel consumption of their vehicles helps to improvetheir market share. LÄS MER

  3. 2. Experimental design and vortex analyses in turbulent wake flows

    Författare :Bengt E. G. Fallenius; Jens H. M. Fransson; Henrik Alfredsson; Marianna Braza; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; bluff bodies; wake flow; experimental design; vortex detection; flow control; asymptotic suction boundary layer;

    Sammanfattning : A new experimental setup for studies on wake flow instability and its control that successfully has been designed and manufactured, is introduced and de- scribed. The main body is a dual-sided flat plate with an elliptic leading edge and a blunt trailing edge. LÄS MER

  4. 3. Dynamic Thermal Rating for Improved Utilization of Wind Farm Export Systems : A Methodology for Improving Load Profile Estimation of Wind Farm Export Transformers

    Författare :Zhongtian Li; Patrik Hilber; Tor Laneryd; Stefan Ivanell; Nguyen Nga; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dynamic thermal rating; wake effect; turbine availability; transformer lifetime; transformer aging; dynamisk termisk klassificering; väckningseffekt; turbintillgänglighet; transformatorlivslängd; transformatoråldring; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The power system components connected to renewable energy sources, such as transformers, are often oversized and conservatively loaded. The design of transformers normally ignores the intermittent nature of the connected renewable energy sources (e.g. solar, wind). LÄS MER

  5. 4. Analysis of Flow Structures in Wake Flows for Train Aerodynamics

    Författare :Tomas W. Muld; Dan Henningson; Gunilla Efraimsson; Shia-Hui Peng; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Train Aerodynamics; Slipstream; Wake Flow; Detached-EddySimulation; Proper Orthogonal Decomposition; Koopman Mode Decomposi-tion; Surface-mounted Cube; Aerodynamic Train Model; Fluid mechanics; Strömningsmekanik; Vehicle engineering; Farkostteknik;

    Sammanfattning : Train transportation is a vital part of the transportation system of today anddue to its safe and environmental friendly concept it will be even more impor-tant in the future. The speeds of trains have increased continuously and withhigher speeds the aerodynamic effects become even more important. LÄS MER

  7. 5. Analysis of the Unsteady Flow Field of a Passenger Vehicle

    Författare :Lennert Sterken; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wind tunnel; Wake; CFD; Pressure measurements; Extensions; Yaw response; External aerodynamics; Aerodynamic forces;

    Sammanfattning : Political legislation and consumer requirements for a sustainable society require that vehicle manufacturers focus on reduced fuel consumption and lower emissions. Areduction in the overall energy consumption can be directly linked to a decrease of the driving resistance, where the aerodynamic drag significantly contributes at velocities above 70km/h. LÄS MER