Scientists at Lawrence Livermore National Laboratory study potential of drag-reducing devices on semi-trucks to conserve billions of gallons, save tens of billions of dollars and spare tens of millions of tons of CO2
Each year, the 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. That fuel consumption could be reduced by billions of gallons a year through the use of drag-reducing devices on trucks, according to studies by researchers at Lawrence Livermore National Laboratory.
The computational images represent a single flow simulation around a typical on-the-road heavy vehicle at highway speed from different viewpoints. In this simulation, the trailer is aerodynamically treated by skirts and a tail fairing. The simulation incorporates a full-scale high-fidelity truck model with moving wheels. The flow field around the vehicle is highlighted by streamlines which are colored by velocity magnitude.
The findings will be described today in a talk at the American Physical Society's Division of Fluid Dynamics (DFD) meeting in San Francisco, Calif. A press briefing featuring this and several other talks will be streamed live over the Web from the conference at 1:00 p.m. PST on Monday, Nov. 24 in room Foothill F of the San Francisco Marriott Marquis. For more information, email email@example.com
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 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 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.
"Even a minor improvement in a truck's fuel economy has a significant impact on its yearly fuel consumption," Salari said. "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."
"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," Salari said.
ABOUT THE APS DIVISION OF FLUID DYNAMICS
The Division of Fluid Dynamics (DFD) of the American Physical Society (APS) exists for the advancement and diffusion of knowledge of the physics of fluids with special emphasis on the dynamical theories of the liquid, plastic and gaseous states of matter under all conditions of temperature and pressure. DFD Website: http://www.aps.org/units/dfd/index.cfm
Jason Socrates Bardi | newswise
'Super yeast' has the power to improve economics of biofuels
18.10.2016 | University of Wisconsin-Madison
Engineers reveal fabrication process for revolutionary transparent sensors
14.10.2016 | University of Wisconsin-Madison
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences