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  • 1.
    Thannan, Andreas
    et al.
    University of Skövde, School of Technology and Society.
    Göransson, Andreas
    University of Skövde, School of Technology and Society.
    Utformining av vindavledare för flakkåpa2012Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Due to future EU-regulations, car manufacturers need to reduce their carbon dioxide emissions in order to compete with other companies. This report discusses the development of a wind deflector for Auto-kaross i Floby AB´s Ekobox mounted on a Volkswagen Transporter. The goal is to, due to future regulations of a maximum of 175 CO2/km for lightweight transport vehicles, reduce fuel costs and carbon diox-ide emissions by reducing air resistance. A study of aerodynamics and today’s market was made to find solutions applied to similar prob-lems. Through a costumer survey made by Autokaross, customer needs could be identified which formed the product specification. To gather a big amount of ideas during the concept generation several brainstorming methods were applied in sessions. The ideas were de-veloped into concepts and through consultations from the supervisor at Autokaross the most interesting concepts were picked out. The most important part in the project was the analysis in CFD, Computational Fluid Dynamics, where different cross sections were tested as well as full 3D-models to see what forms performs best and gets the lowest air resistance. When the final concept was to be chosen a concept selec-tion matrix was made were the results from the CFD-simulations had the biggest impact. The final result consists of two parts, a roof spoiler and a boattail, together with Autokaross existing side skirt which ful-fills the goal to reduce the air resistance and thus the carbon dioxide emission and the fuel costs. With these three parts the air resistance is reduced by 27 percent.

  • 2.
    Treijner, Christofer
    et al.
    University of Skövde, School of Technology and Society.
    Svensson, Mattias
    University of Skövde, School of Technology and Society.
    Experimentell studie av reversibel axialfläkt: Med avseende på utformning av nav/skovelbas samt minsta/största skovelvinkel2012Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In this thesis a new construction of a reversible axial flow fan is being studied. By performing experiments on different variants of a fan wheel an evaluation is done. Factors to be varied are the design of the hub and the blade base as well as blade angle. All tests is performed in a test rig established by AB Akron-maskiner. The test rig is constructed according to ISO 5801.

    Experiments show that the hub design itself does not have a significant impact on the performance. Changes in performance are detected when various combinations of hubs and blade base are tested. The greatest difference in efficiency between the best and worst hub/blade base combination is about 20%. It is of great interest to have access to this information because a simpler design of the hub allows greater flexibility in the manufacturing. An upper limit for the maximum blade angle is partly due to the appearance of stall but mainly the limitations of the fan motor. The minimum blade angle has also the result founding in engine size. The performance is improved if the radial airflow through the blades cavity is blocked. A blockage causes an increase in efficiency by 5-12% and a reduction in sound power level of 2-3 dB. For optimal performance, the design of the hub should be spherical and the blade base curved and shaped to the hub. This is the same type of hub that is produced today. Maximum and minimum useful blade angle is 50° and 25° to the rotation direction.

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