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Substantial drag reduction of a tractor-trailer vehicle

Dec 01, 2017 · The reduction rate of CD in this condition is approximately 16.4% compared with reference tractor–trailer vehicle without gap fairing. At Re = 8.6 × 10 5, the CD values of the vehicle model installed with basic CRF and the gap fairing with a gap length of G/G0 = 0.6 are 0.664 and 0.572, respectively.

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Truck Trailer Drug Reduction Project (3) (1) (1) - TITLE

View Truck Trailer Drug Reduction Project (3) (1) (1) from EEE 2405 at Multimedia University of Kenya. TITLE PAGE 1 TABLE OF CONTENTS ACKNOWLEDGEMENT.vi ABSTRACT.vii 1 2 INTRODUCTION.1 1.1 …

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Improving Transportation Efficiency Through Integrated

• Improved tractor-trailer gap mgmt Transient calibration optimization Parasitics Oil flow reduction Low viscosity oil Higher oil temperature Active piston cooling jets A-Sample Optimization Mule Truck Arrives DDC Final 13L Powertrain Integration Shakedown Testing

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5 Vehicle Power Demands | Review of the 21st Century Truck

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).

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US6585312B2 - Tractor trailer gap treatment - Google Patents

A tractor-trailer system uses aerodynamic principles to use crosswind to its advantage. The system has a curvilinear duct by having a attaching a convex body on the trailer front and a concave body on the back of the cab. When a cross wind enters the gap, it creates a negative pressure (compare to ambient) on the convex surface (trailer front) and a positive pressure on concave surface (back

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Numerical Study of Track-Trailer Gap Aerodynamics

The gap region of a truck typically contributes to about 20-25% of the overall vehicle drag and hence presents an opportunity for considerable level of drag reduction. A basic two box bluff body (2D & 3D) model was used to investigate how the flow field changes by changing the gap …

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Pathway to Cost-Effective Commercialized Freight Efficiency

–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.

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An Aerodynamic Design and Optimization of a Heavy Truck

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.

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Review of Aerodynamic Drag Reduction Devices for Heavy

There are two primary types of devices aimed at reducing aerodynamic drag in the tractor-trailer gap. These are tractor side extensions and devices in the gaps. 7.3.2 Technologies 7.3.2.1 Tractor-Mounted Side extenders (shown in Figure 15) act to extend the rear-edge of the cab to inhibit the flow of air into the gap …

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Practical Devices for Heavy Truck Aerodynamic Drag Reduction

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.

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A Study of Reynolds Number Effects and Drag-Reduction

Jun 19, 2012 · Computational Simulation of Tractor-Trailer Gap Flow with Drag-Reducing Aerodynamic Devices 1 November 2005 An Automated Shape Optimization Procedure for Drag Reduction …

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Truck Trailer Drug Reduction Project (3) (1) (1) - TITLE

View Truck Trailer Drug Reduction Project (3) (1) (1) from EEE 2405 at Multimedia University of Kenya. TITLE PAGE 1 TABLE OF CONTENTS ACKNOWLEDGEMENT.vi ABSTRACT.vii 1 2 INTRODUCTION.1 1.1 …

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Computational Simulation of Tractor-Trailer Gap Flow with

Nov 01, 2005 · Computational simulations of the Modified Ground Transportation System 1 (M-GTS), a 1/14 th-scale simplified tractor-trailer geometry, are performed at both laboratory and full-scale Reynolds numbers using the NASA overset grid code OVERFLOW 2.Steady Reynolds' Averaged Navier-Stokes (RANS) simulations are conducted to deepen the understanding of tractor-trailer gap flow structure, …

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Vehicle /Trailer Efficiency

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

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Substantial drag reduction of a tractor-trailer vehicle

Dec 01, 2017 · The reduction rate of CD in this condition is approximately 16.4% compared with reference tractor–trailer vehicle without gap fairing. At Re = 8.6 × 10 5, the CD values of the vehicle model installed with basic CRF and the gap fairing with a gap length of G/G0 = 0.6 are 0.664 and 0.572, respectively.

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(PDF) Substantial drag reduction of a tractor-trailer

Kim et al. [12] utilized the gap fairing between truck and trailer and obtained 17.6 % reduction. In the studies of Kim et al. [4, 5,13] used the same truck-trailer model, they designed the roof

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A Wind-Tunnel Study of the Effect of Gap Flow and Gap

The effect of gap width on the aerodynamic drag of a cab-over-engine tractor-trailer combination has been investigated for full-scale gap widths ranging from 0.61 m (24 in) to 1.83 m (72 in.) over a yaw angle range of 0 to 20 deg. The average drag on the vehicle was found to increase by 16 percent as the gap width increased from 0.61 m to 1.83 m.

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Improving Fuel Efficiency of Tractor Trailer Trucks with

on class-8 tractor trailers. For a tractor trailer with a streamlined tractor-cab the flow separates off the cab, bridges across the trailer gap and grazes the front corners of the trailer. For a van trailer, the recirculating vortices in the gap reduce static pressure behind the tractor cab and increase the pressure on the front face of the

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Reduced Aerodynamic Drag for Truck-Trailer Configurations

Oct 08, 2013 · In a second study, the flap has been fitted on the tractor and trailer units of a truck-trailer combination. Four settings were surveyed for this investigation, one of which proved to decrease drag by up to 15%. A last configuration where the gap between …

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US8403400B2 - Air flow guide for a tractor trailer gap

Air flow guide for a tractor trailer gap Download PDF Info Publication number US8403400B2. US8403400B2 US13/208,729 US201113208729A US8403400B2 US 8403400 B2 US8403400 B2 US 8403400B2 US 201113208729 A US201113208729 A US 201113208729A US 8403400 B2 US8403400 B2 US 8403400B2 Authority US United States Prior art keywords

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