Influence Of Additive Properties On
Heat Transfer Reduction In A Gun Tube
Author(s)
F. Seiler, G. Mathieu & H. Peter
Abstract
Extreme heat flux is transferred during gun tube firing from the hot propelling
gases into the barrel of the powder gun. Some well known methods can be used
to reduce the gun tube heating, e.g. by adding special materials into the
propellant or by placing them at the back side of the projectile fired. A very
familiar additive is the Swedish additive, which is a combination of Titanium
dioxide particles (TiO2) and wax. Other additive particles are for example
calcium carbonate (CaCO3), Aerosil (SiO2) and others. It is supported by several
studies that the additive particles form a thin deposit layer on the barrel’s inner
surface with a thickness of some micrometers per firing, thus protecting the inner
surface of the gun barrel. For estimating the heating of the barrel in the case
where an additive layer is present, a boundary layer model combined with the
heat conduction equation was applied for calculating the bore temperature,
especially at the interface between the additive and gun barrel. The aim is to
lessen as much as possible the interface temperature by additive adding. The heat
flux formation depends mainly, for a specified gun weapon, on the thickness a of
the additive layer as well as on the physical properties of the additive applied,
i.e., the density ρ, the specific heat c and the heat conductivity λ. These
parameters have been varied in a wide range in order to find out those additive
properties for which the heating of the gun barrel is most efficiently lessened.
1 Introduction
Unfortunately the mechanism behind the protective action of additive particles
has not been fully understood until now. There are several theories trying to
explain the action of additives on erosion reduction in gun barrels. One of them
deals with heat transfer reduction by forming a thin additive layer of some
Keywords
Related Book
Other papers in this volume
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