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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. Wind-Tunnel Truck Models.

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Aerodynamic Forces on Trucks

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Aerodynamic forces on trucks l.jpg

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 l.jpg

Wind-Tunnel Truck Models


Wind tunnel truck models3 l.jpg

Wind-Tunnel Truck Models

Netting over the cab

Six-component force balance support


Tractor and trailer with gap l.jpg

Tractor and Trailer with Gap

Rounded vertical

leading edges on

trailer


Surface maps l.jpg

Surface Maps


Drag forces l.jpg

Cab

Trailer

Drag Forces


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Fluctuations of Drag Forces

Cab

Trailer


Side forces l.jpg

Side Forces

Cab

Trailer


Fluctuations of side forces l.jpg

Fluctuations of Side Forces

Cab

Trailer


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Rolling Moments

Cab

Trailer


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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


Effect of front bluntness l.jpg

(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


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Platoon Combinations

Flow

Front truck (CDF) Rear truck (CDR)

Rounded-Rounded

Rounded-Blunt

Blunt-Blunt

Blunt-Rounded


Drag vs truck separation l.jpg

CDAvg = (CDF +CDR)/(CDF iso+CDRiso)

Drag vs. Truck Separation

Blunt - Blunt


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Drag vs. Truck Separation

Blunt - Blunt

Blunt - Rounded

Rounded - Blunt

Rounded - Rounded


Average drag summary l.jpg

Blunt - Rounded

Rounded - Rounded

Blunt - Blunt

Rounded - Blunt

Average Drag Summary

Total Drag/Total Drag in isolation


Slide17 l.jpg

Square

cavity

Decreasing CD


Average drag summary18 l.jpg

No less savings

No greater savings

Average Drag Summary

Blunt - Rounded

Rounded - Rounded

Blunt - Blunt

Rounded - Blunt


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