Experimental Investigation of the Aerodynamic Benefits of Truck Platooning Lawrence Livermore National Laboratory

Format:

Conference/Event

Author/Creator:

Salari, Salari, author.

Contributor:

Ortega, Jason

Conference Name:

WCX World Congress Experience (2018-04-10 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2018

Summary:

AbstractLawrence Livermore National Laboratory (LLNL) has conducted a series of scaled wind tunnel tests to investigate the aerodynamic benefits of heavy vehicle platooning and the availability of cooling air for trailing vehicles on two- and three-vehicle platoons. To measure the aerodynamic drag, scale models are mounted onto a LLNL designed splitter plate by means of a low-friction linear bearing and a load cell located within each model trailer. In addition to drag, pressure measurements are made with a pitot probe positioned at the center of each model radiator grill. Particle Image Velocimetry (PIV) and Infrared Thermography (IRT) measurements are used to map the three-dimensional velocity field and flow structures around the vehicles. Three different vehicle platoon configurations have been tested: two aligned vehicles with separation distances of 5-320 with and without trailer boattails; three aligned vehicles with 30, 40, and 50 separation distances between first and second vehicles and 5-220 separation distances between the second and third vehicles without trailer boattails; two misaligned vehicles with separation distances of 30, 50, and 160 with a misaligned percentage of 0-50% based on the trailer width with and without trailer boattails. Wind tunnel data is acquired for yaw angles ranging from 9° to 9° in 3° increments to account for crosswind effects. The cooling air supply to the trailing vehicle varies with vehicle spacing and becomes quite small and even negative for spacing less than 15; however, at 120 and larger separation distances it asymptotically approaches 70% of the lead vehicle air supply. For separation distances of 30-50, the aerodynamic benefit for the two-vehicle platoon ranges from 21% to 23% and 10% to 13% for vehicles with and without trailer boattails, respectively. Increasing the number of vehicles in the platoon increases the overall aerodynamic benefit and an additional benefit is achieved by adding boattails to the platoon vehicles

Notes:

Vendor supplied data

Publisher Number:

2018-01-0732

Access Restriction:

Restricted for use by site license