Wind tunnel used to test trucks' wind resistance

Testing could result in 3.4 billion gallons saved of annual fuel costs

A wind tunnel at Moffett Field normally used to test airplanes and other things that fly is being used to test the aerodynamics of a big diesel truck, with the intention of saving up to 3.4 billion gallons of fuel a year.

The truck will never get off the ground, but reducing wind resistance could save 3.4 billion gallons of diesel fuel each year in the trucking industry, scientists behind the research believe.

That translates to $10 billion savings at truck stops across the nation.

After more than a decade of research, scientists at Lawrence Livermore National Laboratory today unveiled technology to allow the trucks to slide through the wind.

At a news conference inside a wind tunnel at NASA's Ames Research Center at Moffett Field, scientists explained how reducing the aerodynamic drag of a semi-truck can increase the truck's fuel efficiency, saving $10 billion in diesel fuel costs annually.

Aerodynamic drag is caused by pressure differences around the vehicle, and at highway speeds semi-trucks use more than 50 percent of the energy produced by the vehicle engine to overcome that drag, according to scientists.

In late January, scientists brought a semi-truck to the wind tunnel, owned by the U.S. Air Force and located at Ames. There, the truck has been undergoing tests, according to Kambiz Salari, a senior scientist at the Lawrence Livermore National Laboratory.

Scientists have learned that they can increase fuel efficiency by up to 12 percent by making a series of fairly simple changes on trucks, Salari said. Those include inserting a gap-seal plate between the truck and the trailer, base flaps on the side of the trailer in the rear, and an under-body device on the base of the trailer that blocks air flow beneath the truck can increase fuel efficiency by up to 12 percent, Salari said.

The technology to reduce the aerodynamic drag still needs up to three years to complete before it can be put on the market, Salari said.

But testing the truck in a wind tunnel helps speed up the process.

"This is a significant step toward reducing the United States' dependency on fossil fuels," Director George Miller of the Lawrence Livermore National Laboratory said.

The wind tunnel, which is large enough to fit a Boeing 737 plane, became operational in 1987 and functions as a test zone for parachutes, helicopters, planes and other vehicles, according to David Duesterhaus of the Ames Research Center.

Wind blows up to 100 knots in the tunnel and can simulate whatever speed is needed, Duesterhaus said.


Like this comment
Posted by M.E.
a resident of Monta Loma
on Feb 17, 2010 at 9:52 pm

They are engineers, not scientists.

Like this comment
Posted by USA
a resident of Old Mountain View
on Feb 18, 2010 at 7:09 pm

USA is a registered user.

Thanks, M.E. I have worked at LLNL. There are far more engineers there than practicing scientists.

The gap seal and air dams have been used on race cars and other low-drag vehicles for many years. Why did we need a 10 year taxpayer-funded study by government employees and Lord knows how much wind tunnel time to understand this? Of course, one could also ask, if there is $10 B in savings or anything close to that, why haven't the truck manufactures and the transport companies implemented these simple changes?

Sorry, but further commenting on this topic has been closed.

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