A Comparison between Experiment and Simulation for Concept VIC regenerative Liquid Propellant Guns. 2. 105 mm

Abstract : Regenerative liquid propellant gun (RLPG) technology is sufficient mature to allow the testing of the first 155-mm liquid propellant gun. In support of the development of this artillery weapon, test fixtures in 30-mm and 105-mm sizes have been built and fired. This report describes the analysis and modeling of the 30-mm gun fixture. Future reports will concentrate on the 105-mm and 155-mm guns. The Concept VIC gun design is described. The basic assumptions in the numerical lumped parameter model are described. Modifications to the model required by the VIC gun are given. There is a brief discussion of the 30- mm test program. The model is first benchmarked against a series of medium charge firings. These are the best characterized set of experiments, with the best reproducibility. The process of choosing input values for the gun code is discussed in detail. The result is excellent agreement with all of the experimental data. The model is then used to predict the performance of some of the short-charge firings. The muzzle velocities are predicted very accurately. The pressure profiles are not. The reasons for the lack of agreement in the pressure profiles are discussed. Keywords: Liquid gun propellants, Liquid monopropellant, Regenerative gun, Liquid propellant guns, Lumped parameter model, Gun propellants.