Accession Number : ADA195831

Title :   Viscous Modeling of the Interior Ballistic Cycle.

Descriptive Note : Periodic rept. no. 3, Oct 87-Mar 88,

Corporate Author : FRAUNHOFER INST FUER KURZZEITDYNAMIK - ERNST-MACH-INST FREIBURG IM BREISGAU (GERMANY F R)

Personal Author(s) : Heiser, R

PDF Url : ADA195831

Report Date : Mar 1988

Pagination or Media Count : 8

Abstract : A mathematical model for the turbulent compressible gas phase of interior ballistics flows was developed. For this the k-epsilon model has been employed which is the most widely used and tested model of the present turbulence models besides the algebraic type of models. Measurements of pressure, projectile and flow velocities in a subsonic gun simulator with an inert single-phase flow are reported, The model gun is of constant diameter and of preburned propellant type and allows a travel distance of the projectile of about 1 m inside the tube and an exit velocity of 40 m/s. The projectile is 250 mm long and weighs 0.953 kg. The measurements were performed with nitrogen gas pressurized within the initial volume to 8 bar above atmospheric pressure (guage pressure); silicone oil droplets were added to the gas to represent the gas velocity. Flow velocity measurements wer obtained at four axial stations by laser Doppler anemometry. Keywords: Computerized simulation; West Germany. (jes)

Descriptors :   *COMPUTERIZED SIMULATION, *GUNS, *INTERIOR BALLISTICS, BAROMETRIC PRESSURE, COMPRESSIBLE FLOW, DIAMETERS, DOPPLER SYSTEMS, FLOW RATE, GASES, LASER ANEMOMETERS, MATHEMATICAL MODELS, NITROGEN, OILS, PHASE, PRESSURE, PROPELLANTS, SILICONES, SIMULATORS, SUBSONIC CHARACTERISTICS, TURBULENCE, VAPOR PHASES, VELOCITY, VISCOSITY, WEST GERMANY

Subject Categories : Guns
      Computer Programming and Software
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE