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A Study of an Active Rear Diffuser Device for Aerodynamic Drag Reduction of Automobiles Seoul National University
- Format:
- Conference/Event
- Author/Creator:
- Kang, Kang, author.
- Conference Name:
- SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)
- Language:
- English
- Physical Description:
- 1 online resource
- Place of Publication:
- Warrendale, PA SAE International 2012
- Summary:
- The goal of this study is to develop an actively translatingrear diffuser device to reduce the aerodynamic drag experienced bypassenger cars. The feature of this device is hidden under the rearbumper ordinarily not to ruin the external design of the car andslips out backward under the high-speed driving condition. By thisstudy, a movable arc-shaped semi-diffuser device is designed tomaintain the streamlined automobile rear underbody configuration.It's installed under the rear bumper of a passenger car.Seven types of rear diffuser devices whose positions, slid outlengths and widths are differing with the basic shape installed inthe rear bumper section of a passenger car and performedComputational Fluid Dynamics (CFD) analyses under rotating wheeland moving ground conditions. The main purpose of this study isthat explains the aerodynamic drag reduction mechanism of apassenger car via an actively translating rear diffuser device at ahigh speed driving condition. The base pressure of the rear surfaceof passenger car is increased by install the rear diffuser device,because it prevents the low pressure air coming through theunderbody from directly soaring up to the rear surface of thetrunk. At the same time, it increases a diffusing effect tounderbody flow which lowers the velocity and raises the pressure,bringing about an aerodynamic drag reduction.Finally, the automobile aerodynamic drag is reduced about anaverage of more than 4% in 450 mm length with the baseconfiguration. And also maximum 7% of drag reduction accomplishedchanging the shape of the rear diffuser device into various types.At the end, the diffuser device was applied to the YF SONATAdeveloped and produced by the Hyundai Motors Company. The dragreduction was achieved up to 5.2% in the speed range of 80 km/h ~120 km/h. In addition, owing to generation of negative lift by thediffuser device, it is expected the driving stability improved inhigh speed condition
- Notes:
- Vendor supplied data
- Publisher Number:
- 2012-01-0173
- Access Restriction:
- Restricted for use by site license
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