Vehicle Aerodynamic Drag Reduction Using Air Jet System

Parametric Studies ◽

Computational Fluid Dynamics Cfd ◽

Cfd Method ◽

Study on the air jet wheel deflector system using state-of-the-art of Computational Fluid Dynamics (CFD) technique based on an open domain CFD software (OpenFOAM) is performed to reduce vehicle aerodynamic drag. Fabijanic’s simple vehicle model [1] is used for both the mesh sensitivity study and validation of current CFD technique. It was found that CFD method used in this study is reliable tool for the forecasting of the aerodynamic drag coefficient. Parametric studies were conducted to investigate aerodynamic effects of the conventional wheel deflector and air jet wheel deflector system. For the conventional wheel deflector, 3.6% of drag reduction was achieved with a non-dimensional deflector height of 1/6, but the drag force tends to increase as the non-dimensional height increased. On the other hand, it was shown that air jet wheel deflector system can reduce vehicle aerodynamic drag up to 7.5% at the non-dimensional air jet velocity of 1.0. Therefore it would be concluded that air jet wheel deflector is a useful device to reduce aerodynamic drag of automobile.

ASME-JSME 2018 Joint International Conference on Information Storage and Processing Systems and Micromechatronics for Information and Precision Equipment ◽

Development of Active Aerodynamic Improvement Devices for Automobiles

10.1115/isps-mipe2018-8523 ◽

2018 ◽

Author(s):

SangWook Lee

Keyword(s):

Drag Coefficient ◽

Aerodynamic Drag ◽

State Of The Art ◽

Wind Tunnel Test ◽

Open Domain ◽

Vehicle Model ◽

Pressure Distributions ◽

Computational Fluid Dynamics Cfd ◽

Cfd Method

Study on the steady blowing system using state-of-the-art of Computational Fluid Dynamics (CFD) technique based on an open domain CFD software, OpenFOAM[1], is performed to reduce vehicle aerodynamic drag. Realistic vehicle model, DrivAer[2], is used for the validation of current CFD technique. Both the aerodynamic drag coefficient and the surface pressure distributions were compared between current CFD and reference wind tunnel test. It was found that CFD method used in this study is reliable tool for the forecasting of the aerodynamic drag coefficient. The influence of steady blowing from the sharp edge of the roof end is investigated based on DrivAer Estate back model. Parametric study was performed by changing blowing speed at the three different Reynolds number. It was shown that the steady blowing leads around 3% drag reduction by enhancing wake balance especially, reinforcing downwash flow from the roof. Therefore it would be concluded that steady blowing is a useful device to reduce aerodynamic drag of automobile.

Computational analysis of air jet wheel deflector for aerodynamic drag reduction of road vehicle

Microsystem Technologies ◽

10.1007/s00542-018-3992-1 ◽

2018 ◽

Vol 24 (11) ◽

pp. 4453-4463 ◽

Cited By ~ 2

Author(s):

Sang Wook Lee

Keyword(s):

Drag Reduction ◽

Computational Analysis ◽

Aerodynamic Drag ◽

Road Vehicle ◽

Air Jet ◽

Aerodynamic Drag Reduction of SUV Based on Underbody Cover Board

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.477 ◽

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 ◽

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.

Numerical Study on Aerodynamic Drag Reduction of an Urban-Concept Car for Energy-Efficient Competition

MATEC Web of Conferences ◽

10.1051/matecconf/201822002001 ◽

2018 ◽

Vol 220 ◽

pp. 02001

Author(s):

Himsar Ambarita ◽

Munawir R Siregar

Keyword(s):

Drag Reduction ◽

Numerical Method ◽

Energy Efficient ◽

Aerodynamic Drag ◽

Numerical Study ◽

Three Dimensional ◽

Original Design ◽

Pressure Distributions ◽

The present work deals with aerodynamic drag reduction of an urban-concept car for energy-efficient competition. Several modifications have been proposed to the original design of the urban-concept of the car. In order to investigate the effect of the proposed modifications numerical method has been developed. In the numerical method three-dimensional governing equations have been solved numerically. Turbulent flow is modeled using k-epsilon model. The two designs have been simulated at five different inlet velocities. The inlet velocity varies from 10 m/s to 20 m/s. The velocity contour, velocity vector and pressure distributions have been plotted. The results show that the proposed modifications improve the performance of the proposed design. At the given inlet velocities, the aerodynamic drag coefficient of the new design decreased 26.63 % in comparison with original design. It is recommended to modify the original design of the urban concept car by implementing the proposed modifications. The new design will improve the performance of the urban concept car.