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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 Models. Wind-Tunnel Truck Models.

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Aerodynamic Forces on Trucks

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  1. 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

  2. Wind-Tunnel Truck Models

  3. Wind-Tunnel Truck Models Netting over the cab Six-component force balance support

  4. Tractor and Trailer with Gap Rounded vertical leading edges on trailer

  5. Surface Maps

  6. Cab Trailer Drag Forces

  7. Fluctuations of Drag Forces Cab Trailer

  8. Side Forces Cab Trailer

  9. Fluctuations of Side Forces Cab Trailer

  10. Rolling Moments Cab Trailer

  11. 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

  12. (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

  13. Platoon Combinations Flow Front truck (CDF) Rear truck (CDR) Rounded-Rounded Rounded-Blunt Blunt-Blunt Blunt-Rounded

  14. CDAvg = (CDF +CDR)/(CDF iso+CDRiso) Drag vs. Truck Separation Blunt - Blunt

  15. Drag vs. Truck Separation Blunt - Blunt Blunt - Rounded Rounded - Blunt Rounded - Rounded

  16. Blunt - Rounded Rounded - Rounded Blunt - Blunt Rounded - Blunt Average Drag Summary Total Drag/Total Drag in isolation

  17. Square cavity Decreasing CD

  18. No less savings No greater savings Average Drag Summary Blunt - Rounded Rounded - Rounded Blunt - Blunt Rounded - Blunt

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