Numerical Simulation of Fluid Dynamics and Payload Dissemination in a Dual-Chamber Grenade
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1993
- Accession Number
- ADA262178
Entities
People
- Michael J. Nusca
Organizations
- United States Army Research Laboratory