ESDU 10017:2011

$126.75

A guide to the alleviation of the base drag of a flat plate with a blunt trailing edge

Published By	Publication Date	Number of Pages
ESDU	2011-10-01	48

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Category: ESDU

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Description

The subsonic flow of the turbulent boundary layers over the
upper and lower surfaces of a flat plate with a blunt trailing edge
separate at the base to form an unsteady, periodic wake in the form
of a vortex street. The oscillating wake induces a substantial base
drag, a prediction method for which is given in Appendix B of ESDU
10016. For aircraft, and in many other applications, it is
important to maintain low drag and so various means have been
tested whereby the periodicity is controlled – either eliminated or
moderated.

ESDU 10017 describes the devices used and provides guidance on
their effectiveness in the reduction of base drag at subsonic and
low supersonic speeds. The four classes of trailing-edge device
that have been tested, i.e. base bleed, splitter plates, cavities
and non-linear trailing edges, are discussed with particular
reference to base drag alleviation and any other useful aerodynamic
aspects. The concluding remarks include a table summarising
possible base drag reductions for the various devices.

Additional information