Abstract
High pressure acting on the vehicle’s body plays an important role in deciding the aerodynamic drag. An idea has been suggested to enhance the aerodynamic performance for small passenger car by relieving the high pressure in the engine room. The high pressure inside the engine room can be released to the outside of the vehicle through a hole perforated on the wheel house liner. About 1 % of the drag coefficient can be improved with the 1.88 % of the radiator air mass flow rate increment by installing the top hole with slots on the wheel house liner. Flow simulations are performed at the driving velocity of 110 km/h with the moving wall condition of the same velocity. The tire is rotating to catch more precise flow physics around a tire and wheelhouse liner.
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Abbreviations
- A :
-
frontal projection area of car, m2
- C d :
-
drag coefficient
- Hh :
-
top hole height of wheel house liner, cm
- V ∞ :
-
free stream velocity, m/s
- Wh :
-
top hole width of wheel house liner, cm
- (C d)norm :
-
normalized drag coefficient
- (m Radiato)base :
-
radiator air mass flow rate of base model
- (m Radiato)simulation :
-
radiator air mass flow rate of modified simulation model
- Δm Radiator :
-
radiator air mass flow rate difference between the base model and modified simulation model
- ρ :
-
free stream air density, kg/m3
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Ha, S.J., Chun, U., Park, J.Y. et al. Enhancement of aerodynamic performance through high pressure relief in the engine room for passenger car using cfd technique. Int.J Automot. Technol. 18, 779–784 (2017). https://doi.org/10.1007/s12239-017-0077-6
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DOI: https://doi.org/10.1007/s12239-017-0077-6