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Aerodynamic Interference

The AGARD Fluid Dynamics Panel organised a three-day Specialists"Meeting on
"Aerodynamic Interference" that was held at the U.S. Naval Ordnance Laboratory, White Oak,
Silver Spring, Maryland, USA, from 28th to 30th September, 1970. The Programme Committee
was chaired by Dr. D. Zonars, and was composed of Monsieur P. Carriere (France), Professor
K. Gersten (Germany), Dr. U. Sacerdote (Italy), Dr. J. Seddon (U. K. ), Dr. J. A. Steketee
(Netherlands), and Dr. R. E. Wilson (USA), the last six gentlemen also accepting the duties
of Session Chairmen. During the course of the meeting, the authbr Of this report was
invited by the Chairman of the Fluid Dynamics Panel, Professor W. R. Sears, to prepare a
critidue of the topics discussed, and as a direct consequence, the present Commentary
includes the constructive criticisms of Professor Sears, Dr. D. Kuchemann- and Mr. R. J.
Templin. The author must emphasise, however, that the editing is his own and as such, he
accepts full responsibility for all of the opinions expressed in the follOwing paragraphs.

The meeting was intended to provide a forum for the discussion of theories and
experiments to explain the existing comprehension of aerodynamic interference, and to
provide some guidelines and design rules to improve the flight characteristics of military
and commercial aircraft and weapons- The speed régimes were restricted to subsonic,
transonic and supersonic Mach numbers.

The objective~of this report, therefore, is to assess the current state—of—the—art
of the analytical and test techniques concerned with Junction flows (in terms of that
which was preached and that which should have been recited, perhaps), to outline their
advantages and disadvantages and to indicate any relevant omissions.';In particular, it
should strive to show the practical applications of the work presented with the view of
limmediate help to the aircraft designer. It was considered that the report should be
candid and forthright to stimulate discussion, accepting, of course, that an element of
the authorfs personal bias would be involved.

There were six sessions at the meeting. Sessions I and II dealt with Wing—body
and wing-body—tail interference, Sessions III and IV with the flow fields-about propulsion
components and Sessions V and VI exclusively with the flows about airframe stores. A
total of thirty—five papers was presented, where it was noted that the major emphasis
inclined towards configuration studies of lift, drag, pitching moment and stability, and
the optimisation of configuration geometry to provide the least drag.