One-Dimensional Analysis of a Liquid Jet in a Regenerative Liquid Propellant Gun.

摘要

In the regenerative liquid propellant gun (RLPG) a liquid monopropellant is injected by a moving piston in the form of an annular jet from a reservoir into a combustion chamber. Currently there are a number of lumped parameter models of the RLPG in use in the United States. However, the structure and spatial extension of the jet are not considered in any of these models. In this report the details of the jet description in the first fully one-dimensional continuum model of the RLPG in the United States is presented. Jet structure and ballistic performance in terms of pressures, pressure gradients, muzzle velocity and accumulation are examined for varying jet breakup conditions. The major conclusions are: (1) jet breakup length has a modest impact on ballistic performance in terms of muzzle velocity and maximum chamber pressure for the 25-mm gun considered compared to ballistic performance predicted by a lumped parameter simulation, and (2) the one-dimensional representation of a jet produces a pressure gradient which is significantly different from the pressure gradient currently used in lumped parameter simulations. (jes)