Isentropic data for real hydrogen are calculated in a range of pressures up to 30,000 atmospheres and temperatures up to 3500 0 K. The effects of ionization, excitation, and dissociation are considered negligible because of the relatively low temperatures and high densities involved. The effects of the intermolecular force are accounted for by fitting a virial coefficient equation to low temperature high density experimental data. These calculated data in turn are fitted to an empirical entropic equation of state. This particular equation of state is convenient for describing many thermodynamic processes.

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In previous work the effect of chambrage, the ratio c-' the diameter of the propellant chamber to the barrel bore of a gun, hai been analyzed theoretically. This analysis has been applied to a gin of effectively infinite chamber length and of varying chamber diameters in which the propellant is all burned before the projectile begins to move. The present paper describes experiments perfo.xn-ed to check the theoretical results. These were conducted with two different length 0.50 caliber gun barrels and with chambers of various diameters up to 2.44 inches. Air was compressed in the chamber behind light plastic projectiles, which were released at the proper pressures. T'e projectiles broke timing wires outside of the gun barrel, yielding projectile velocities. The experim3ntal and theoretical results are in very good agreement.

ABSTRACT:A computer study for predictins high-,speed launcher performance was conducted using a one-dimensional hydrodynamics computer code.This computer code uses the Lagrangian scheme, and is based on the "q" method as devised by Von Neumann and Richtmyer.These calculations provide understanding for the proper variation of the launcher parameters for optimization of launcher performance.A series of calculations for the 2-in. The results will be applied to the operation of the model launchers existing in the ranges at the Naval Ordnance Laboratory.

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