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Streamlined tails - the effects of truncation on aerodynamic drag

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conference contribution
posted on 06.01.2021, 10:11 by Jeff Howell, Eleanor Rajaratnam, Martin Passmore
Significant aerodynamic drag reduction is obtained on a bluff body by tapering the rear body. In the 1930's it was found that a practical low drag car body could be achieved by cutting off the tail of a streamlined shape. The rear end of a car with a truncated tail is commonly referred to as a Kamm back. It has often been interpreted as implying that the drag of this type of body is almost the same as that for a fully streamlined shape. From a review of the limited research into truncated streamlined tails it is shown in this paper that, while true for some near axisymmetric bodies, it is not the case for many more car-like shapes. For these shapes the drag reduction from an elongated tail varies almost linearly with the reduction in cross section area. A CFD simulation to determine the drag reduction from a truncated streamlined tail of variable length on the simple Windsor Body is shown by way of confirmation.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

SAE Technical Papers

Source

WCX SAE World Congress Experience

Publisher

SAE International

Version

AM (Accepted Manuscript)

Rights holder

© SAE International

Publisher statement

This paper was accepted for publication in the publication SAE Technical Papers and the definitive published version is available at https://doi.org/10.4271/2020-01-0673.

Acceptance date

15/01/2020

Publication date

2020-04-14

Copyright date

2020

ISSN

0148-7191

eISSN

2688-3627

Language

en

Location

Online

Event dates

13th April 2020 - 15th April 2020

Depositor

Prof Martin Passmore. Deposit date: 4 January 2021

Article number

2020-01-0673

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