Abstract
Regenerative liquid-propellant guns (RLPG) have been studied for many years. Liquid propellant is injected through a piston or pistons into a combustion chamber as the gun is e ring. The propellant combusts and pushes the projectile down the tube. The chamber pressure also pushes the piston (s), controlling the propellant injection. RLPG gun e rings almost always show large high-frequency pressure oscillations. To study this phenomenon, a two-dimensional axisymmetric e uid-dynamics model of the combustion chamber/gun tube of an RLPG has been developed. High-frequency oscillations are generated naturally by the code. Recently, the code has been extended to three dimensions. The major dife culty in the simulations has been modeling the jet breakup and combustion. A number of different approximations to the jet breakup have been implemented. The most useful approximation has been to assume that most of the propellant is in an intact core. Comparisons have been made between the model and gun e rings, leading to methods for reducing the pressure oscillations.
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