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Shape Study for a Low-Air Resistance Air Deflector - The Second Report
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Abstract
We reported, in our first report1), the study of shapes of air deflectors that have strong yawing angle characteristics for the air resistance encountered when vehicles are running at high speed, taking into account the ambient wind.
However, it is rarely the case that the optimum shape of air deflector, which was obtained and reported in our first report, is directly adopted for practical use.
This paper reports the results of measurement tests on how the air resistance increases (worsens) when an air deflector is mounted on the cab of a vehicle: in the case when the air deflector was slightly changed on the same vehicle; or when the parameters of the vehicle (the height of the rear body) were changed for the same air deflector.
We obtained the following results:
Considerations and adjustments are required not to allow flows passing over upper and side surfaces of the air deflector to hit the front surface of the rear body.
Further, the fuel consumption under the above conditions was also estimated by simulation.
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Citation
Fujimoto, T., Niinuma, A., and Sakai, K., "Shape Study for a Low-Air Resistance Air Deflector - The Second Report," SAE Technical Paper 950633, 1995, https://doi.org/10.4271/950633.Also In
References
- Fujimoto Tsutomu Shape Study for a Low Air Resistance Air Deflector SAE No. 930301
- Mason, William T. Jr. Wind Tunnel Development of Dragfoiler-A System for Reducing Tractor-Trailer Aero-Dynamic Drag SAE No. 750705
- Buckeley, Frank T. Jr. Comparisons of Effectiveness of Commercially Available Devices for the Reduction of Aerodynamic Drag on Tractor-Trailers SAE No. 750704
- Marks Colin H. Buckeley, Frank T. Jr. Walston, William H. Jr An Evaluation of the Aerodynamic Drag Reductions Produced by Various Cab Roof Fairings and a Gap Seal on Tractor-Trailer Trucks SAE No. 760107
- Servais Ronald A. Bauer Paul T. Aerodynamic Devices can Significantly Reduce the Fuel Consumption of Trucks: Experience with CECA Designs SAE No. 750707
- Buckeley, Frank T. Jr. Marks Colin H. Walston, William H. Jr. Analysis of Coast-Down Data to Assess Aerodynamic Drag Reduction on Full-Scale Tractor-Trailer Trucks in Windy Environments SAE No. 760850
- Fujimoto T. Matsuda A. Ikeda T. An Evaluation Method of Fuel Economy of Commercial Vehicles Using Energy Consumption SAE 892528
- Fujimoto T. Matsuda A. Ikeda T. Evaluation Method for Truck Fuel-Economy Using Chassis Dynamometer JSAE Review 11 2 April 1990
- Nouzawa Takahide Others Experimental Analysis of Aerodynamic Characteristics Using a Model of Vehicle Shape Japan Society of Automobile Engineers Science Lecture Advance Print 891 May 1989 891022
- Drollinger Richard Heavy Duty Truck Aerodynamics SAE No. 870001