Download EBOOK A Reassessment of Heavy-Duty Truck Aerodynamic Design Features and Priorities PDF for free


Download EBOOK A Reassessment of Heavy-Duty Truck Aerodynamic Design Features and Priorities PDF for free Category: Society & Social Sciences
The author of the book: Edwin J Saltzman
Format files: PDF, EPUB, TXT, DOCX
The size of the: 355 KB
Language: English
ISBN-13: 9781287270591
Edition: Bibliogov
Date of issue: 2 August 2013

Description of the book "A Reassessment of Heavy-Duty Truck Aerodynamic Design Features and Priorities":

Between 1973 and 1982, the NASA Dryden Flight Research Center conducted "coast-down" tests demonstrating means for reducing the drag of trucks, buses, and motor homes. Numerous configurations were evaluated using a box-shaped test van, a two-axle truck, and a tractor-semitrailer combination. Results from three configurations of the test van are of interest now in view of a trucking industry goal of a 0.25 drag coefficient for tractor-semitrailer combinations. Two test van configurations with blunt-base geometry, similar to present day trucks (one configuration has square front comers and the other has rounded front comers), quantify the base drag PDF increase associated with reduced forebody drag. Hoemer's equations predict this trend; however, test van results, reinforced by large-scale air vehicle data, indicate that Hoemer's formula greatly underestimates this dependence of base drag on forebody efficiency. The demonstrated increase in base drag associated with forebody refinement indicates that the goal of a 0.25 drag coefficient will not be achieved without also reducing afterbody drag. A third configuration of the test van had a truncated boattail to reduce afterbody drag and achieved a drag coefficient of 0.242. These results are included here and references are identified for other means ePub of reducing afterbody drag.

Download EBOOK A Reassessment of Heavy-Duty Truck Aerodynamic Design Features and Priorities PDF for free


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Edwin J Saltzman

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Download EBOOK A Reassessment of Heavy-Duty Truck Aerodynamic Design Features and Priorities PDF for free



Download EBOOK A Reassessment of Heavy-Duty Truck Aerodynamic Design Features and Priorities for free

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