Minimisation Of Accelerations During
Load Ejection
Author(s)
E. A. Brizuela & G. Trinidad
Abstract
Some ordnance loads such as underwater sensors or flying decoys are
acceleration-sensitive, and it would be desirable to tailor the ejection so as to
achieve the desired kinetic energy at the muzzle whilst minimising the peak
acceleration of the load.
This paper looks at the consequences for the load of different time histories of
pressurising the combustion chamber or cartridge, given a desired muzzle
velocity. Four different cases are examined: adiabatic and polytropic expansion
of the combustion gases, constant pressure combustion and a case of rising
pressure combustion.
An interesting result is that for the adiabatic case (very fast propellant
burning) there is a combustion chamber length which minimises peak
acceleration, a length which does not necessarily coincide with that of the
propellant charge.
Slow propellant burning (near constant pressure) is shown to be optimal in
regards to minimising accelerations; it also maximises barrel usage.
Keywords: ordnance, ejection, acceleration.
1 Introduction
Some ordnance loads such as underwater sensors or flying decoys are
acceleration-sensitive, and it would be desirable to tailor the ejection so as to
achieve the desired kinetic energy at the muzzle whilst minimising the peak
acceleration of the load.
Whereas for the usual ordnance loads the speed at which the propellant burns
and the volume of the combustion chamber or cartridge are dictated purely by
Keywords
ordnance, ejection, acceleration.
Related Book
Other papers in this volume
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