Aerodynamic Design Criteria for Class 8 Heavy Vehicles Trailer Base Devices to Attain Optimum Performance

Salari, Kambiz; Ortega, Jason

doi:10.2172/1015861

Cited by 3 publications

(1 citation statement)

References 1 publication

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“…In literature there are no certain agreements concerning the optimum length of this device. Cooper [10] observed an optimum length of the device around 0.6m, Croll et al [21] showed a benefit in increasing the length of the device up to 2.4m, while, in Salari [22] measurements, no reasonable improve of drag reduction are observed when the length of the device is increased from 0.8m to 1.2m.…”

Section: Devices Dimension Optimizationmentioning

confidence: 97%

Heavy Truck Drag Reduction Obtained from Devices Installed on the Trailer

Salati

Cheli

Schito

2015

SAE Int. J. Commer. Veh.

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The flow-field around a “common” European heavy truck, equipped with several different trailer devices, is investigated using steady and unsteady simulations.\ud This work demonstrates how with simple devices added on the trailer it is possible to strongly decrease the aerodynamic drag over 10%, with an increase of overall dimensions below 1% without any change to the load capacity of the trailer.\ud Several devices, installed on the trailer, are tested on a target vehicle and the shape of the “airbag”, the “fin”, the “boat tail” and the “front-rear trailer device” has been optimized to achieve the maximum in drag reduction in front wind. The performance of the optimized devices are tested also in cross wind conditions with the yaw angle varying from 0° to 30°.\ud The truck equipped with the front-rear trailer device is also investigated using time variant simulation with yaw angle of 0°, 5°, 10°.\ud Detached eddy simulation (DES) with one equation Spalart-Allmaras as turbulence model is used to perform the analysis of the unsteady flow; the two equation k-ω SST turbulence model is selected for the steady-state RANS simulations. The unsteady simulations are performed using computational meshes on the order of 40 million of elements while RANS simulation are done with mesh of 10 million of elements

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Section: Devices Dimension Optimizationmentioning

confidence: 97%

Heavy Truck Drag Reduction Obtained from Devices Installed on the Trailer

Salati

Cheli

Schito

2015

SAE Int. J. Commer. Veh.

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Skin-friction topology on tail plate for tractor—trailer truck drag reduction

Woodiga

Salazar

Wewengkang

et al. 2018

J Vis

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Reinforcing Information Fluency: Instruction Collaboration in Senior Capstone Laboratory Course

Tsai¹,

Mlis²

2018 ASEE Annual Conference &Amp; Exposition Proceedings

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This paper presents a study examining the effect of direct information fluency instruction in a Mechanical Engineering senior capstone laboratory course. An experiment was designed where the students examined different drag reduction techniques on heavy vehicles. This topic was selected because the students would be forced to carry out a literature search beyond their fluid mechanics textbook. The study was designed to examine a) students' attitudes toward research practices and b) whether supplemental instruction activities in information fluency would produce measurable improvements in the students' information fluency skills. A research attitudes survey given to the course corroborated past research that online tools are the preferred research tool and perceived to be easier to use than resources such as databases and the library. The class was then evenly divided into a test group and a control group. A librarian gave the test group supplemental in-class instruction that emphasized methods in searching, evaluating the quality of, and proper usage of research sources. The control group was given additional activities related to the experiment. Two quantitative methods were employed to assess the information fluency skills of the two different groups before and after the supplemental instruction. First, students completed information fluency skills assessments prior to and after the instructional activity. Second, the students' technical reports for this experiment and the one prior were scored using a rubric measuring the information fluency skills demonstrated. The data from the skills assessment showed improvement in search strategies in the test group as compared to the control group. The data from the writing assessment showed significant improvement in the quality of sources used in the test group as compared to the control group. The results support the hypothesis that the instructional activity produced measurable improvements in some of the areas of information fluency examined in this study.

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Aerodynamic Design Criteria for Class 8 Heavy Vehicles Trailer Base Devices to Attain Optimum Performance

Cited by 3 publications

References 1 publication

Heavy Truck Drag Reduction Obtained from Devices Installed on the Trailer

Heavy Truck Drag Reduction Obtained from Devices Installed on the Trailer

Skin-friction topology on tail plate for tractor—trailer truck drag reduction

Reinforcing Information Fluency: Instruction Collaboration in Senior Capstone Laboratory Course

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