This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Aerodynamic Drag of a Vehicle and Trailer Combination in Yaw
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Typical production vehicle development includes road testing of a vehicle towing a trailer to evaluate powertrain thermal performance. In order to correlate tests with simulations, the aerodynamic effects of pulling a trailer behind a vehicle must be estimated. During real world operation a vehicle often encounters cross winds. Therefore, the effects of cross winds on the drag of a vehicle–trailer combination should be taken into account. Improving the accuracy of aerodynamic load prediction for a vehicle-trailer combination should in turn lead to improved simulations and better thermal performance. In order to best simulate conditions for real world trailer towing, a study was performed using reduced scale models of a Sport Utility Vehicle (SUV) and a Pickup Truck (PT) towing a medium size cargo trailer.
The scale model vehicle and trailer combinations were tested in a full scale wind tunnel. Utilizing a full scale wind tunnel allowed for very low blockage conditions and testing at large yaw angles by placing both the vehicle and the trailer entirely on the wind tunnel turntable and balance. This unique setup allowed for the measurement of all aerodynamic forces and moments on the vehicle, which could be used to improve vehicle dynamics modeling of a vehicle-trailer combination. The results of this paper show that the forces and moments on a vehicle-trailer combination change significantly at large yaw angles, and that zero yaw testing may be insufficient to predict the real world aerodynamic performance.
CitationLopes, Y., Taylor, M., Lounsberry, T., and Fadler, G., "Aerodynamic Drag of a Vehicle and Trailer Combination in Yaw," SAE Technical Paper 2017-01-1540, 2017, https://doi.org/10.4271/2017-01-1540.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
|[Unnamed Dataset 2]|
- Ingram, K., , “The Wind-Averaged Drag Coefficient Applied to Heavy Goods Vehicles,” TRRL Supp. Report 293, 1978, ISSN 0305-1315
- Walter, J., Duell, E., Martindale, B., Arnette, S., “The DaimlerChrysler Full-Scale Aeroacoustic Wind Tunnel,” SAE Technical Paper 2003-01-0426, 2003, doi:10.4271/2003-01-0426.
- Beauvais, F., “Aerodynamic Characteristics of A Car-Trailer Combination,” SAE Technical Paper 670100, 1967, doi:10.4271/670100.
- Hammache, M., and Browand F.. “On the aerodynamics of tractor-trailers.” The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains. Springer Berlin Heidelberg, 2004. 185–205.
- Cooper, K., “Truck Aerodynamics Reborn - Lessons from the Past,” SAE Technical Paper 2003-01-3376, 2003, doi:10.4271/2003-01-3376.
- Hammache, M., Michaelian, M., and Browand, F., “Aerodynamic Forces on Truck Models, Including Two Trucks in Tandem,” SAE Technical Paper 2002-01-0530, 2002, doi:10.4271/2002-01-0530.
- Weir, D., Klein, R., and Zeliner, J., “Crosswind Response and Stability of Car Plus Utility Trailer Combinations,” SAE Technical Paper 820137, 1982, doi:10.4271/820137.
- Cooper, K. and Leuschen, J., “Model and Full-Scale Wind Tunnel Tests of Second-Generation Aerodynamic Fuel Saving Devices for Tractor-Trailers,” SAE Technical Paper 2005-01-3512, 2005, doi:10.4271/2005-01-3512.
- SAE International Surface Vehicle Recommended Practice, “Performance Requirements for Determining Tow-Vehicle Gross Combination Weight Rating and Trailer Weight Rating,” SAE Standard J2807,WIP.
- U-Haul, “6x12 Cargo Trailer Rental,” https://www.uhaul.com/Trailers/6x12-Cargo-Trailer-Rental/RV/, accessed Sep. 2016.