The potential drag optimization of BYD Qin-Pro EV is firstly illustrated based on the CFD simulation method and verified in wind tunnel tests, and the drag coefficient (
) of this model is reduced from 0.314 to 0.227. Then, by correlating CFD simulation with wind tunnel test, the accuracy of different simulation methods is compared. By analyzing the coherent structures and critical features of the flow field, the relationship between the wake vortex structure and drag, as well as the drag losses caused by wheel rims to overall power loss, are expounded. In addition, according to the road coastdown tests under various conditions, it is found that as the vehicle accelerates, grille sealing and exterior design optimization exhibit a positive trend in reducing drag, but the underbody deflectors are opposite. These findings hold great significance for the aerodynamic development of EVs, particularly in the context of platformization, where there are diverse aesthetic and engineering requirements. This research offers valuable insights into drag reduction for typical sedan and can provide guidance for future aerodynamic advancements in this field.
