ESDU 08010:2008

$62.40

Example of Similarity Methods Applied to Aircraft Drag Data from Flight Test

Published By	Publication Date	Number of Pages
ESDU	2008-06	19

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ESDU 08010 provides an example of the application of similarity
methods to assist in the correlation of in-flight measurements of
aircraft drag coefficient. Similarity rules are used to identify
the form of the variables used in the process of correlation.

The aircraft used to obtain the drag measurements is a heavy,
subsonic, low-level attack type powered by two side-mounted
low-bypass-ratio turbo-fan engines (fixed geometry intakes). An
outline of the flight-testing from which the data were drawn is
included. The flight-tests formed part of a programme to determine
the changes in lift, drag, pitching moment and downwash induced by
fitting a range of stores under the wing considered. Measurements
were taken at eleven Mach numbers.

An equation for drag coefficient, C_D ,
is derived in terms of a chosen similarity function using these
data. The equation contains three independent unknowns, all of
which are correlated by a similarity parameter. The correlations
are shown to accord with the measured data.


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Published Code	ESDU
Published By	ESDU
Publication Date	2008-06
Pages Count	19
Language	English
File Size	286.7 KB
ISBN	9781862466272

ESDU 08010:2008

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