The sensitivity of road heavy vehicles aerodynamic coefficients to different testing parameters (scenario, vehicle type, turbulence intensity) is experimentally investigated in this paper through wind tunnel experiments. Tests have been carried out in the Politecnico di Milano wind tunnel using 1:10 scale vehicle models. Force and moment mean aerodynamic coefficients have been analyzed for different vehicle types (VAN, trailer, tanker), scenarios (flat ground, embankment, viaduct), expositions (upwind, downwind), turbulence conditions (low turbulence and atmospheric boundary layer simulation) and varying yaw angles. Force and moment aerodynamic coefficient have been measured by means of a six-components dynamometric balance, while the flow pattern around the vehicle has been assessed through pressure taps on the vehicle surface. At low yaw angles, it has been shown that variations in the Reynolds number (up to 2 x 105) and in the turbulence conditions (turbulence intensity Iu=2% and Iu=20%) do not lead to significant modifications in the two main aerodynamic coefficients, that are the vertical force and the rolling moment coefficients. On the other hand, both these components have highlighted a strong sensitivity to both the scenario (flat ground, single and double viaduct and embankment) and the vehicle's position on the scenario itself (upwind and downwind condition). All the data obtained from this experimental campaign have been used also to set up a numerical-experimental methodology, based on the aerodynamic admittance function, for the evaluation of the safety of a road heavy vehicle subjected to cross wind.


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    Title :

    Wind tunnel tests on heavy road vehicles: cross wind induced loads


    Additional title:

    Windkanaluntersuchungen von schweren Straßenfahrzeugen: Seitenwindlasten


    Contributors:
    Cheli, F. (author) / Corradi, R. (author) / Sabbioni, E. (author) / Tomasini, G. (author)


    Publication date :

    2009


    Size :

    12 Seiten, 26 Bilder, 2 Tabellen, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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