The entire automotive industry is moving towards lower CO2 emissions and higher energy efficiency. Especially for higher driving speeds this can be achieved by minimizing aerodynamic drag. This paper presents a case study of a post-sedan four-seater in the D-segment to show that future drag targets can reach a drag coefficient lower than 0.2. In order to reach this drag target, it is necessary to combine the benefits of experimental and numerical development tools in an integrated process. Furthermore, already during early stage of the development process an interactive discussion between the aerodynamicists and designers took place. The overall development process is described in detail, presenting the main aerodynamic improvements made to the model. The presented case study has shown that a future aerodynamic drag target of 0.2 and lower for a four-seater in the D-segment is possible. However, such a low drag target requires a well-engineered development process. An integrated aerodynamic development including numerical simulations and wind tunnel testing as well as design directions in an early development stage supports this goal. Further drag penalties for the transition from quarter-scale to full scale models have been considered. Nevertheless, a final optimization in full scale is mandatory. Especially cooling air flow and add-on parts, such as rear view mirrors, wheel spoiler et cetera, represent an important drag optimization potential for full scale wind tunnel testing. Furthermore, coordination with other vehicle development fields like design, thermal management, passive safety and comfort are essential to optimize the aerodynamic and, thus, the energy efficiency of future vehicles.
Future aerodynamic drag targets: A case study
2012
13 Seiten, 15 Bilder, 13 Quellen
Conference paper
English
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