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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 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 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



Drag forces l.jpg

Cab

Trailer

Drag Forces



Side forces l.jpg
Side Forces

Cab

Trailer



Rolling moments l.jpg
Rolling Moments

Cab

Trailer


Two trucks in tandem l.jpg
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


Platoon combinations l.jpg
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


Drag vs truck separation15 l.jpg
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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