The results of the perennial cooperative research work between the BMW Group and the Research Institute of Automotive Engineering and Vehicle Engines Stuttgart (FKFS) are presented here. In recent years, several methods of reducing fuel consumption have been explored. These include aerodynamic shape optimization and other potential methods such as a smooth underbody. However, as the power of engines increases, more effective cooling is needed, resulting in increased cooling air mass flow requirements. This increase in airflow in turn requires an increase in size of the air inlets, usually resulting in an increase in the vehicles aerodynamic drag and hence a conflict of interests. If the implementation of cooling airflow in the models is supplemented by measurements to determine the cooling air mass flow, a variety of new perspectives for the aerodynamic development process is opened up. Body shape configurations can consequently be analyzed with respect to their influence on cooling airflow. The volume flow rate through the radiator in full size models is usually measured with a hot-wire radiator traverse. It was necessary to develop a new measurement system especially for all kinds of vehicle studies. Using three measurement technologies, the complete development process chain is covered with respect to cooling airflow measurements. In the second part of the presentation, the potential of body shape modifications, in other words, proportion parameter modifications, on internal airflow are analysed. It is shown that modifications even in areas that would normally not be expected to cause large effects on the internal airflow, can generate a considerable influence on the mass flow. The presentation covers the problems of cooling airflow measuring techniques, the transferability of the measurements on models to the production vehicle and the influence of several body shell parameters on cooling airflow.


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    Titel :

    Optimization of vehicle design regarding internal airflow in the aerodynamic development process


    Weitere Titelangaben:

    Optimierung des Fahrzeugentwurfs bezüglich der internen Luftströmung im aerodynamischen Entwicklungsprozess


    Beteiligte:


    Erscheinungsdatum :

    2006


    Format / Umfang :

    13 Seiten, 16 Bilder, 7 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch