Apr 16, 2007 · The test focused on three areas within the tractor-trailer system: tractor-trailer gap, trailer sides and trailer wake. A 23% aerodynamic drag reduction was demonstrated by utilizing trailer skirts, base plates and lengthened side extenders and air fairing. A 20% drag reduction was also demonstrated for several combinations of devices.
A study has been carried out to determine the reduction in the aerodynamic drag of tractor-trailer trucks brought about by fairings mounted on the cab roof and a vertical seal mounted across the gap between the tractor and the trailer. This study was conducted using one-eighth-scale models in a wind
Combining that trailer performance with the forecast next-generation tractor performance would yield a 19 percent reduction in fuel consumption (a C d reduction of about 38 percent) achievable at 65 mph, in the 2015-2020 time period. This result is derived through a method of multiplication of fuel-consumption reductions (DOE, 2010a).
Sep 24, 1991 · A truck tractor-trailer assembly having reduced aerodynamic drag. The skins of the tractor cab and trailer extend longitudinally toward each other and terminate in opposed trailing and leading edges which are as close together as possible while still permitting a full range of yaw and upward pitch about a fifth wheel assembly coupling the trailer to the tractor.
Sep 01, 2021 · To reduce air resistance on a tractor and trailer — and thereby improve fuel economy — a full range of aerodynamic add-ons are available. One of the prime places for aerodynamic improvement …
Variation of the tractor-trailer gap on a 1:15-scale model at zero yaw revealed relatively constant drag on the tractor while the trailer drag increased by a factor of three as the gap was increased from zero to 1.55*A0.5 (ref. 6). Also part of the DOE effort, a 1:8-scale generic tractor-trailer geometry was …
Sep 02, 2014 · Truck from 2009 baseline HD Tractor-Trailer (Class 7-8) Up to 23% : 48% : 43% • Small tractor-trailer gap • Steeply –Raked Windshield . 19 Technology Assessment: Engine and Powerplant Optimization and Vehicle and Trailer Efficiency
The objective of the aerodynamic drag reductiontechnology development activity was to design,develop, and demonstrate aerodynamic devices thatwould improve the fuel economy of tractor-trailer trucksunder operational conditions. A further objective was todevelop novel technologies and concepts. To ensurethe unique nature of the technology underconsideration for this activity, an extensive literaturereview was …
Aerodynamic drag: trailer gap reduction (on tractor or trailer), trailer wake treatments, trailer side skirts Drivetrain optimization: friction and wear reduction, hybridization (even for Class 8 long haul) Accessory load reduction: electrification of accessory loads like power steering and air conditioning
Ref. 3 for details). Drag reduction techniques such as cab side-extenders and cab roof air deflectors are all commonly found on today's tractor-trailers and have resulted in wind-averaged drag coefficient reductions of up to 0.25 from the baseline value which is near unity. More advanced techniques such as tractor-trailer gap seals and
May 31, 2021 · The drag of the trailing truck showed an opposite behavior, that is, a moderate increase in drag with decreased inter-vehicle distance. This was a result of a decreased acceleration of the flow around the front edges and an increase in pressure in the tractor-trailer gap.
The SmartWay-certified van trailer must be equipped with side skirt fairings plus either a trailer boat tail or a tractor-trailer gap fairing. The combined trailer aerodynamic treatment is estimated to achieve at least a 5 percent fuel consumption reduction compared to a standard trailer.
Dec 28, 2010 · Selenbas, B, Gunes, H, Gocmen, K, Bahceci, U, & Bayram, B. "An Aerodynamic Design and Optimization of a Heavy Truck for Drag Reduction." Proceedings of the ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 3. Istanbul, Turkey.
Drag reduction is one way to reduce vehicle fuel consumption. Tractor-trailers have a higher drag coefficient than other vehicles due to their bluff-body shape. Over the years, numerous add-on devices have been invented to help reduce drag and fuel consumption. The current research extends our previous idea of add-on humps and investigates their effect in conjuction with curved boat-tail flaps.
Mar 16, 2021 · Digging in a little deeper into this number, heavy tractor-trailer, which makes up 30% of the jobs in transportation and drivers, grew by 2.1%, for a total of 1.9 million jobs. Growth stopped however for 2020 due to COVID-19, with overall demand for …
Sep 01, 2021 · One of the prime places for aerodynamic improvement is the tractor-trailer gap, which has a direct correlation to air resistance, or drag. In other words, the longer the gap, the greater the drag.
Class 8 tractor-trailers are responsible for 12-13% of the total US consumption of petroleum. 12% reduction in fuel use = 4.4 billion gallons of diesel fuel saved per year and 44 million tons of CO2 emission. $17.2 billion saved/year ($3.91 per gallon diesel) 17% reduction in …
–These technologies were validated and confirmed that 20% RR reduction –Trailer swing clearance (Impact on fairings, 5th wheel height Tractor-Trailer Gap) –Camera (CMS) position and mounting optimization –Completed optimization of boat tail with finalized tractor and trailer.