Aerodynamic Forces on a Simplified Car Body: Towards Innovative Designs for Car Drag Reduction

2010 ◽  
Author(s):  
Mahmoud Khaled ◽  
Fabien Harambat ◽  
Anthony Yammine ◽  
Hassan Peerhossaini
Keyword(s):  
Drag Reduction ◽  
Drag Coefficient ◽  
Aerodynamic Drag ◽  
Cooling System ◽  
Aerodynamic Force ◽  
Lift Coefficient ◽  
Force Measurements ◽  
Vehicle Model ◽  
Aerodynamic Forces ◽  
Aerodynamic Drag Reduction

The present paper exposes the study of the cooling system circulation effect on the external aerodynamic forces. We report here aerodynamic force measurements carried out on a simplified vehicle model in wind tunnel. Tests are performed for different airflow configurations in order to detect the parameters that can affect the aerodynamic torsor and to confirm others previously suspected, especially the air inlets localization, the air outlet distributions and the underhood geometry. The simplified model has flat and flexible air inlets and several types of air outlet, and includes in its body a real cooling system and a simplified engine block that can move in the longitudinal and lateral directions. The results of this research are generic and can be applied to any new car design. Results show configurations in which, with respect to the most commonly adopted underhood geometries, the overall drag coefficient can be decreased by 2%, the aerodynamic cooling drag coefficient by more than 50% and the lift coefficient by 5%. Finally, new designs of aerodynamic drag reduction, based on the combined effects of the different investigated parameters, are proposed.

scholarly journals Aerodynamic drag reduction of a simplified vehicle model by promoting flow separation using plasma actuator

2019 ◽  
Vol 5 (0) ◽  
pp. 19-00354-19-00354 ◽  
Author(s):  
Keigo SHIMIZU ◽  
Takuji NAKASHIMA ◽  
Satoshi SEKIMOTO ◽  
Kozo FUJII ◽  
Takenori HIRAOKA ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Flow Separation ◽  
Aerodynamic Drag ◽  
Plasma Actuator ◽  
Vehicle Model ◽  
Aerodynamic Drag Reduction

Aerodynamic drag reduction by controlling flow structure of simplified vehicle model using plasma actuator

2018 ◽  
Vol 2018 (0) ◽  
pp. OS1-11
Author(s):  
Keigo SHIMIZU ◽  
Takuji NAKASHIMA ◽  
Satoshi SEKIMOTO ◽  
Kozo FUJII ◽  
Takenori HIRAOKA ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Flow Structure ◽  
Aerodynamic Drag ◽  
Plasma Actuator ◽  
Vehicle Model ◽  
Aerodynamic Drag Reduction

Aerodynamic Drag Reduction of SUV Based on Underbody Cover Board

2014 ◽  
Vol 602-605 ◽  
pp. 477-480
Author(s):  
Jing Yu Wang ◽  
Bao Yu Wang ◽  
Xing Jun Hu ◽  
Lei Liao
Keyword(s):  
Flow Field ◽  
Drag Reduction ◽  
Drag Coefficient ◽  
Aerodynamic Drag ◽  
Flow Line ◽  
Wind Tunnel Test ◽  
Aerodynamic Performance ◽  
Simulation Based ◽  
Aerodynamic Drag Coefficient ◽  
Aerodynamic Drag Reduction

The principles and method of computational fluid dynamics were applied to numerical simulate the external flow field about the SUV model. The hybrid mesh of tetrahedral and triangular prismatic as well as the turbulence model of Realizable k-ε was adopted to study the flow field of SUV of flat underground. Then the SUV of complex underground was simulated with the same mesh strategy and boundary condition. The aerodynamic drag coefficient of latter was bigger than former. That illuminated the complex underground has affect to aerodynamic performance of vehicle. The wind tunnel test validated the veracity of numerical simulation. Based on that, the underground cover board was appended; the aerodynamic drag coefficient was depressed. The velocity and pressure distribution and flow line were achieved. The conclusions provide theoretical reference for the further study of aerodynamic drag reduction of complex underground.

Effect of Vortex Generators on Aerodynamic Characteristics of a Car

2011 ◽  
Vol 418-420 ◽  
pp. 1873-1877
Author(s):  
Xu Yan ◽  
Jian Ye ◽  
Zhi Ming Zhao ◽  
Xing Jun Hu ◽  
Lei Liao
Keyword(s):  
Drag Reduction ◽  
Drag Coefficient ◽  
Energy Saving ◽  
Emission Reduction ◽  
Aerodynamic Drag ◽  
Vortex Generator ◽  
Aerodynamic Characteristics ◽  
Vortex Generators ◽  
Numerical Stimulation ◽  
Aerodynamic Drag Reduction

In order to reduce the aerodynamic drag, a domestic car was selected as study object to research the size and the layout of the vortex generator with the method numerical stimulation. By comparing the values of drag coefficient (Cd) the cars with vortex generators (VGs) and the original and then analyzing the mechanism of drag reduction, a final optimized strategy was achieved. It was concluded that VGs can lower the Cd of a car but the effect depends on the size and the layout. Our research achievements can serve as reference for automobile aerodynamic drag reduction, and are also significant to energy saving and emission reduction.

Aerodynamic Drag Reduction Design of Concept Sports Car

2012 ◽  
Vol 184-185 ◽  
pp. 24-27
Author(s):  
Ying Chao Zhang ◽  
Fang Zhao ◽  
Shu Xin Shao ◽  
Guang Yin Jin
Keyword(s):  
Energy Spectrum ◽  
Kinetic Energy ◽  
Drag Reduction ◽  
Drag Coefficient ◽  
Turbulent Kinetic Energy ◽  
Aerodynamic Drag ◽  
Kinetic Energy Spectrum ◽  
Before And After ◽  
Aerodynamic Drag Reduction

Simulations analysis of the aerodynamic for a sports car modeling before and after optimization was introduced in the paper by using commercial CFD code--STAR-CCM+. In the first simulation, we got the drag coefficient, the pressure of convective and the turbulent kinetic energy spectrum，then we found the positions that may affect the drag coefficient. Further analysis inferred that our modifications accorded with the aerodynamic principles. These results can provide the basis for the modeling design and further optimization.

A Study of an Active Rear Diffuser Device for Aerodynamic Drag Reduction of Automobiles

2012 ◽  
Author(s):  
Seung-On Kang ◽  
Jun-Ho Cho ◽  
Sang-Ook Jun ◽  
Hoon-Il Park ◽  
Ki-Sun Song ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Aerodynamic Drag ◽  
Aerodynamic Drag Reduction

scholarly journals A Study of Drag Reduction on Cylinders with Different V-Groove Depths on the Surface

Water ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 36
Author(s):  
Jiyang Qi ◽  
Yue Qi ◽  
Qunyan Chen ◽  
Fei Yan
Keyword(s):  
Drag Reduction ◽  
Drag Coefficient ◽  
Vortex Structure ◽  
Lift Coefficient ◽  
Pressure Coefficient ◽  
Reynolds Numbers ◽  
Groove Surface ◽  
Smooth Cylinder ◽  
Groove Structure ◽  
Reduction Effect

In this study, the drag reduction effect is studied for a cylinder with different V-groove depths on its surface using a k-ω/SST (Shear Stress Transport) turbulence model of computational fluid dynamics (CFD), while a particle image velocimetry (PIV) system is employed to analyze the wake characteristics for a smooth cylinder and a cylinder with different V-groove depths on its surface at different Reynolds numbers. The study focuses on the characteristics of the different V-groove depths on lift coefficient, drag coefficient, the velocity distribution of flow field, pressure coefficient, vortex shedding, and vortex structure. In comparison with a smooth cylinder, the lift coefficient and drag coefficient can be reduced for a cylinder with different V-groove depths on its surface, and the maximum reduction rates of lift coefficient and drag coefficient are about 34.4% and 16%, respectively. Otherwise, the vortex structure presents a complete symmetry for the smooth cylinder, however, the symmetry of the vortex structure becomes insignificant for the V-shaped groove structure with different depths. This is also an important reason for the drag reduction effect of a cylinder with a V-groove surface.

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