ESDU 02008:2009

$163.80

Aerodynamics and Aero-Acoustics of Rectangular Planform Cavities – Part I: Time-Averaged Flow

Published By	Publication Date	Number of Pages
ESDU	2009-05-01	102

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Category: ESDU

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Description

INTRODUCTION

General

The increasing need for the internal carriage of weapons and
stores on combat aircraft in response to the dual requirements of
low drag and low radar signature has created the need for
information on weapons bays with doors. During weapon deployment
the bay is necessarily open to the effects of the external flow,
which creates an unsteady flow environment both within and around
the bay. Such flows can engender not only aerodynamic problems in
terms of increased drag and potential difficulties with weapon
deployment, but also structural and acoustic problems related to
the high intensity tones that can be generated. These structural
and acoustic problems can affect the design of both the bay and its
contents B on-board avionics for navigation and guidance can be
seriously affected by intense acoustic tones and the random
vibrations induced by the unsteady flow. The vibrational
environment alone requires special design standards for equipment
in aircraft, see References 53, 54, 56 and 57, and spacecraft, see
Reference 55.

Although weapons bay design is the main area in which cavity
data are required, other areas, such as undercarriage bay design,
can also benefit from the use of such data. Obviously, the geometry
of weapons and undercarriage bays will vary according to each
application, but a reasonable, albeit idealistic, shape to assume
is a rectangular planform cavity B most researchers have made this
assumption, and it is the configuration adopted in this Data Item.
That is not to say that other configurations are not required;
indeed other planform shapes, such as elliptical, have been tested
and require study in their own right.