Aerodynamic Forces on Trucks

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# Aerodynamic Forces on Trucks - PowerPoint PPT Presentation

Aerodynamic Forces on Trucks. The loads on a single truck as a function of yaw angle and tractor-trailer gap spacing. The drag of two trucks in tandem at zero yaw. . M. Hammache &amp; F. Browand Ground Vehicle Aerodynamics Lab. Wind-Tunnel Truck Models. Wind-Tunnel Truck Models.

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Aerodynamic Forces on Trucks
• The loads on a single truck as a function of yaw angle and tractor-trailer gap spacing.
• The drag of two trucks in tandem at zero yaw.

M. Hammache & F. Browand

Ground Vehicle Aerodynamics Lab

Wind-Tunnel Truck Models

Netting over the cab

Six-component force balance support

Tractor and Trailer with Gap

Rounded vertical

trailer

Side Forces

Cab

Trailer

Rolling Moments

Cab

Trailer

Two Trucks in Tandem
• Previous results reported in SAE paper to be given in March ‘02.
• Drag savings for two trucks in tandem depends upon the drags of individual trucks in isolation, and upon which truck is leading.
• For completeness, we have made additional measurements over a large range of truck drag coefficients

(Top)

(Side)

Cpf = .7

Cpr = -.2

Flow

Skin frictionCDsf = .05

Rounded

Cpf = .22

Cpr = -.2

CDTotal=.47

Effect of Front Bluntness

Blunt

CDTotal = Cpf - Cpr + CDsf = .95

Platoon Combinations

Flow

Front truck (CDF) Rear truck (CDR)

Rounded-Rounded

Rounded-Blunt

Blunt-Blunt

Blunt-Rounded

Drag vs. Truck Separation

Blunt - Blunt

Blunt - Rounded

Rounded - Blunt

Rounded - Rounded

Blunt - Rounded

Rounded - Rounded

Blunt - Blunt

Rounded - Blunt

Average Drag Summary

Total Drag/Total Drag in isolation

Square

cavity

Decreasing CD

No less savings

No greater savings

Average Drag Summary

Blunt - Rounded

Rounded - Rounded

Blunt - Blunt

Rounded - Blunt