Accession Number : ADA262178


Title :   Numerical Simulation of Fluid Dynamics and Payload Dissemination in a Dual-Chamber Grenade


Descriptive Note : Final rept. Jun 1991-Jan 1992


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD


Personal Author(s) : Nusca, Michael J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262178.pdf


Report Date : Feb 1993


Pagination or Media Count : 46


Abstract : The internal design of a grenade used for the thermal dissemination of solid payload into the atmosphere can consist of two concentric cylinders - a pyrotechnic device in the outer annulus and payload material bonded to the wall of the inner cylinder. The two chambers are connected. Combustion of the pyrotechnic produces high pressure within the grenade. A pressure difference between the atmosphere and inside the grenade induces a through-flow that thermally erodes and vaporizes the material in the inner chamber. This material in gaseous form is entrained in this flow and expelled from the grenade. Payload dissemination can be simulated using computational fluid dynamics to solve the Navier-Stokes equations along with chemical species conservation equations. The pyrotechnic combustion is not modeled. Using chamber dimensions and payload chemical properties, this simulation yields velocity, pressure, temperature, density, and chemical composition of the gas in the inner chamber and exiting the grenade. Numerical simulations can aid in understanding the physics of dissemination and be used to conduct parametric design studies.


Descriptors :   *COMPUTATIONAL FLUID DYNAMICS , *GRENADES , VELOCITY , SIMULATION , DENSITY , TEMPERATURE , PAYLOAD , SOLIDS , COMBUSTION , INTERNAL , ATMOSPHERES , CHAMBERS , NAVIER STOKES EQUATIONS , FLUID DYNAMICS , CONSERVATION , FLOW , WALLS , YIELD , PRESSURE , PYROTECHNICS , PHYSICS , CHEMICAL COMPOSITION , CHEMICAL PROPERTIES , LAYERS , MATERIALS , BOUNDARY LAYER , HIGH PRESSURE


Subject Categories : Ammunition and Explosives
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE