동일 Architecture의 서로 다른 외부 형상을 가진 차량들에 대한 공력 성능 개선을 위한 Roof spoiler개발에 대한 연구

Developing and optimizing wake region of a vehicle rear end is important to secure Aerodynamic performance. Most of hatchback vehicle applies a roof spoiler to enhance Aerodynamic performance and specially, this roof spoiler is very important part in a Mini class vehicle having short vehicle length. This roof spoiler is reducing strength of rear wake zone and optimizing flow separation of a roof end to prevent increasing drag. To reduce investment cost in development of vehicles, Common architecture (platform) is applied to same dimensional vehicles or special purpose vehicle as like electric vehicle. And, also most of exterior part (for example, a hood, a side body, a roof, glasses, side doors, a tail gate, underbody structure, etc.) is applied to different vehicles. In these cases, flow field is possible to be changed for these two different vehicles and a roof spoiler should be developed separately. In this study, we can see difference of the Aerodynamic performance for a roof spoiler between same architecture vehicles having same dimension and same body, but having different exterior look. We conducted this study by Aerodynamic wind tunnel test and CFD CAE simulation.