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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
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
Wind-Tunnel Truck Models

Netting over the cab

Six-component force balance support

tractor and trailer with gap
Tractor and Trailer with Gap

Rounded vertical

leading edges on

trailer

side forces
Side Forces

Cab

Trailer

rolling moments
Rolling Moments

Cab

Trailer

two trucks in tandem
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

(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
Platoon Combinations

Flow

Front truck (CDF) Rear truck (CDR)

Rounded-Rounded

Rounded-Blunt

Blunt-Blunt

Blunt-Rounded

drag vs truck separation15
Drag vs. Truck Separation

Blunt - Blunt

Blunt - Rounded

Rounded - Blunt

Rounded - Rounded

average drag summary

Blunt - Rounded

Rounded - Rounded

Blunt - Blunt

Rounded - Blunt

Average Drag Summary

Total Drag/Total Drag in isolation

slide17

Square

cavity

Decreasing CD

average drag summary18

No less savings

No greater savings

Average Drag Summary

Blunt - Rounded

Rounded - Rounded

Blunt - Blunt

Rounded - Blunt

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