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Airframe & Propulsion Interference

The AGARD Fluid Dynamics Panel organised a four-day Symposium on 'Airframe Propulsion
Interference' from 3rd - 6th September 1974. The meeting was held in the Palazzo Aeronautics, Rome,
Italy.
The Programme Committee, which was Chaired by Mr. P.P.Antonatos of Wright Patterson AFB, comprised
Dr.J.Barche (Germany), Professor C.Buongiorno (Italy), M.P.Carriére (France), Mr.R.Dietz (USA),
Mr.J.P.Hartzuiker (Netherlands), Dr.R.C.Pankhurst (UK) and Mr.R.J.Templin (Canada). The members of the
Committee also acted as Chairmen for the four technical sessions. The Conference ended with a
round-table discussion before a large audience for which the Panel consisted of Mr.Antonatos (Chairman),
Dr.Barche, M.Carriére, Professor Ferri (USA) and Mr.Carter (UK).
Section 2 of this report sets the scene for the need for this Symposium and its relation
to the previous Lecture Series by the Propulsion and Energetics Panel on this subject. Sections 3 to 6
inclusive deal with the content and discussions on the four sessions. Section 7 presents the author‘s
conclusions and recommendations to the Fluid Dynamics Panel.
This report contains detailed views and comments which are the responsibility of the author and
does not necessarily represent the views of the Programme Committee.
The subject title 'interference‘ provides almost unlimited scope in the analysis of any aeronautical
subject. There is a particular inevitability of interference in the 'engine airframe combination' which
provides a challenge to the designer and the theoretician. Naturally the ultimate objective of the
outcome of such a meeting as this is the provision of theoretical methods perhaps combined with
empiricisms, to enable us to design intelligently to derive the maximum benefit obtainable from shapes
which are dictated by other-than-fluid-dynamic considerations.
Engines have to be 'accommodated' on the airframe at a variety of positions. To an extent the
early families of subsonic civil transports have tried to wrap their engines in ideal slender bodies and
place them at positions where they and their associated airframes are not aware of each other. The more
recent designs however have had to accept the close wing/nacelle proximity imposed by high by-pass
engines and ground clearance. Future designs are considering noise shielding configurations where the
permission-to-fly becomes more important than the absolute economics. The fighter design has provided
an amazing range of solutions to its particular problems where, as distinct from the transport, drag is
not always of prime importance.