S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Mechanical Aerospace Engineering (기계항공공학부) Theses (Master's Degree_기계항공공학부)
Study on Ultra-Low Aerodynamic Drag Vehicle through Optimization of Rear Shape and Aerodynamic Drag Reduction Devices
차량 후방형상 최적설계와 공력저감장치를 통한 초저공력차량 연구
- 공과대학 기계항공공학부
- Issue Date
- 서울대학교 대학원
- Computational Fluid Dynamics; C.F.D; Aerodynamic Drag; Aerodynamic Drag Reduction Devices; Square Back Vehicle; Rear Shape Optimization
- 학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부, 2015. 2. 김규홍.
- In this study, design of ultra-low aerodynamic drag vehicle was performed through optimization of rear shape and aerodynamic drag reduction devices. Sedan type vehicle was selected as a base model, which is being manufactured in these days. To reduce the aerodynamic drag, its rear shape was redesigned to square back type which is widely known as having low aerodynamic drag. Square back shape was designed by considering only the aerodynamic perspective. As a result, the aerodynamic drag was reduced. In order to minimize the aerodynamic drag of redesigned square back vehicle, optimization was performed. Roof angle, side angle and diffuser angle, which are the component of square back shape, were selected as the design variables. As a result of optimization, aerodynamic drag was decreased by 10.85% compared to initial square back shape. The relation between design variables and aerodynamic drag, together with the aerodynamic characteristics were obtained. Aerodynamic drag of optimal design was reduced by 29.25% compared to sedan type vehicle. To additionally reduce the aerodynamic drag, aerodynamic drag reduction devices(side air dam, under deflector, wheel arch cover) were installed to optimal design of square back type vehicle. As a result of installing aerodynamic drag reduction devices, aerodynamic drag was improved by 33.15% compared to sedan type vehicle.