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Technical Briefs

Drag Reduction of Tractor-Trailers Using Optimized Add-On Devices

[+] Author and Article Information
Fu-Hung Hsu

Department of Mechanical and Aeronautical Engineering, University of California, Davis, CA 95616fhhsu@ucdavis.edu

Roger L. Davis

Department of Mechanical and Aeronautical Engineering, University of California, Davis, CA 95616davisrl@ucdavis.edu

J. Fluids Eng 132(8), 084504 (Aug 26, 2010) (6 pages) doi:10.1115/1.4001587 History: Received July 29, 2009; Revised April 06, 2010; Published August 26, 2010; Online August 26, 2010

Tractor-trailers have a higher drag coefficient than other vehicles due to their bluff-body shape. Numerous add-on devices have been invented to help reduce drag and fuel consumption. The current research extends our previous idea of add-on humps and investigates their effect in conjunction with curved boat-tail flaps. Computational fluid dynamics in the form of unsteady Reynolds-averaged Navier–Stokes and detached-eddy simulations were used to determine viable design strategies. A 3D baseline computational model was constructed using an Ahmed body. Design optimization was applied on the new add-on devices. The results from the optimized design were shown to have a 50.9% reduction in drag coefficient.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Ahmed body geometry

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Figure 2

Hump and curved boat-tail flaps geometry

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Figure 3

Baseline (top), four-hump design (middle), and optimized design (bottom)

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Figure 4

Instantaneous velocity contour at the symmetry plane (m/s, standard k-ε)—baseline (top), four-humps (middle), and optimized design (bottom)

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Figure 5

Instantaneous velocity contour at symmetry plane (m/s, optimized design)—RNG model (top) and DES model (bottom)

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Figure 6

Instantaneous velocity contour at horizontal plane (m/s)—baseline (top), four-hump (middle), and optimized design (bottom)

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Figure 7

Cp at base—baseline (top), four-hump (middle), and optimized design (bottom)

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Figure 8

Cp at horizontal plane—baseline (top), four-hump (middle), and optimized design (bottom)

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