Truck fuel consumption could be reduced by billions of gallons a year through the use of drag-reducing devices on semi tractor trailer trucks. According to new study presented at the American Physical Society’s Division of Fluid Dynamics (DFD) meeting in San Francisco the U.S. national truck fleet of more than 2 million tractor-trailer trucks that cruise America’s highways consume about 36 billion gallons of diesel fuel, representing more than 10 percent of the nation’s entire petroleum use.

We’re seeing some of the ideas on interstate highways now.

According to studies by researchers at Lawrence Livermore National Laboratory the use of drag-reducing devices on trucks could reduce fuel consumption by billions of gallons a year.

Air Flow Simulation Around a Semi Tractor Trailer at Highway Speed. Click image for more info.

Air Flow Simulation Around a Semi Tractor Trailer at Highway Speed. Click image for more info.

Fluid dynamicists Kambiz Salari and Jason Ortega ran aerodynamic tests on a detailed 1/8 scale model of a semi-truck in the wind tunnel facilities at NASA’s Ames Research Center at Moffett Federal Airfield in California.

The truck model was tested in various configurations. In some, it was outfitted with trailer skirts, which are panels affixed along the lower side edges of a trailer that reduce drag resulting from airflow interacting with wheels and other structures under the body of the trailer; in others, a boat tail fairing, a device affixed to the back of the trailer that decreases drag by reducing the trailer wake size, was added. In still other tests, the truck was rigged with both of the drag-reducing devices (or with neither one).

Salari and Ortega found that adding both of the devices – which are currently used in combination on only about three to four percent of the nation’s semi-trucks – reduced the aerodynamic drag by as much as 25 percent, which represents about a 13 percent decrease in fuel consumption.

Salari explained, “Even a minor improvement in a truck’s fuel economy has a significant impact on its yearly fuel consumption. For example, 19 percent improvement in fuel economy, which we can achieve, translates to 6.5 billion gallons of diesel fuel saved per year and 66 million fewer tons of carbon dioxide emission into the atmosphere. For diesel fuel costing $3.96 per gallon, the savings is about $26 billion.”

Salari offers, “We are in the process of designing from the ground-up the shape of the next-generation of highly aerodynamic and integrated heavy vehicles to radically decrease aerodynamic drag and improve the fuel efficiency.”

As consumers that get practically everything used in our lives coming to us by tractor trailer trucks, shaving 13 to 19 percent of the transport cost is pretty interesting. So if you know any truck operators a little encouragement might be in order. With only 3 to 4 percent of the trucks equipped now there is a long way to go.


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