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A Study of Drag Reduction Devices for Production Pick-up Trucks
Technical Paper
2017-01-1531
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper describes a study of drag reduction devices for production pick-up trucks with a body-on-frame structure using full-scale wind tunnel testing and Computational Fluid Dynamics (CFD) simulations. First, the flow structure around a pick-up truck was investigated and studied, focusing in particular on the flow structure between the cabin and tailgate. It was found that the flow structure around the tailgate was closely related to aerodynamic drag. A low drag flow structure was found by flow analysis, and the separation angle at the roof end was identified as being important to achieve the flow structure. While proceeding with the development of a new production model, a technical issue of the flow structure involving sensitivity to the vehicle velocity was identified in connection with optimization of the roof end shape. (1)A tailgate spoiler was examined for solving this issue. It was shown to be effective on real-world roads where there are corners and crosswinds, based on measurement of yaw dependence of drag reduction by the spoiler. This paper presents a detailed explanation of this issue and how it was resolved, focusing especially on the mechanism and effect of the tailgate spoiler. Furthermore, three additional key aerodynamic devices were examined for reducing drag of body-on-frame pick-up trucks: (2) a front spoiler, (3) frame side deflectors, and (4) rear wheel-house covers. The front spoiler reduces underfloor drag commensurate with the increased air volume for front brake cooling as a result of designing a tunnel-like shape upstream of the front tires. The frame side deflectors reduce drag at the rear wheel-houses by deflecting the flow from outside of the frame beams to the rear wheel-houses. The rear wheel-house covers reduce drag produced at the rear wheelhouses. As a result of adopting these devices with new styling, the new production model achieved a drag coefficient (CD) of 0.37 as measured in Nissan’s wind tunnel, representing a 12% improvement over the previous model. The value is significantly better than that of other competitor vehicles, thereby achieving class-leading aerodynamic performance among the same segment pick-up trucks.
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Taniguchi, K., Shibata, A., Murakami, M., and Oshima, M., "A Study of Drag Reduction Devices for Production Pick-up Trucks," SAE Technical Paper 2017-01-1531, 2017, https://doi.org/10.4271/2017-01-1531.Data Sets - Support Documents
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References
- Arai , M. , Development of the Aerodynamics of the New Nissan Murano SAE Technical Paper 2015-01-1542 2015 10.4271/2015-01-1542
- Kremheller , A. The Aerodynamics Development of the New Nissan Qashqai SAE Technical Paper 2014-01-0572 2014 10.4271/2014-01-0572
- Kuo-Huey Chen. , SAE Technical Paper 2015-01-1541 2015 10.4271/2015-01-1541
- Ogata , N. , Iida , N. , and Fujii , Y. Nissan's Low-Noise Full-Scale Wind Tunnel SAE Technical Paper 870250 1987 10.4271/870250
- Boujo , E. , Development of a Prediction Method for Passenger Vehicle Aerodynamics Lift using CFD SAE Technical Paper 2008-01-0801 2008 10.4271/2008-01-0801
- Kawamata , H. , Improvement of Practical Electric Consumption by Drag Reducing under Cross Wind SAE Technical paper 2016-04-05 2016 10.4271/2016-01-1626
- Hucho , W.-H. Aerodynamics of Road Vehicles Society of Automotive Engineers, Inc. Warrendale, PA 978-0-7680-0029-0 1998
- Nakamura , D. , Flow Field Analysis in the Development of the 2013 Model Year Accord Hybrid SAE Technical Paper 2015-01-1534 2015 10.4271/2015-01-1534