Multispecies Reacting Flow Model for the Plasma Efflux of an ETC Igniter - Application to an Open-Air Plasma Jet Impinging on an Instrumented Probe

Abstract

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Experimental and Modeling Studies of Plasma Injection by an Electrothermal Igniter Into a Solid Propellant Gun Charge

“…This is an important result as it necessitates a closer linkage between the charge designer and the igniter designer when the ETC option is utilized. Given independent plasma-propellant modeling results that point to the need for a multicomponent, reacting flow representation of the plasma (17)(18)(19)) and the incompatibility of this level of plasma modeling with the NGEN code, within the constraints of currently available computers, there is an immediate need to validate the NGEN code for the design of ETC guns. A significant step in this effort has been to compare the chamber pressure measured in a subscale ballistic simulator with that computed using the code.…”

“…The NGEN code represents the plasma as a single component gas with properties supplied by the capillary code. Of course, the plasma is actually a chemically diverse and reactive media which has been treated as such in separate modeling studies (17)(18)(19). The macroscopic approach taken in the NGEN code, with respect to plasma representation, has been used to effectively model several solid propellant charge configurations (24,(31)(32).…”

“…The goal of this work is to elucidate the relevant physical, mechanical, and chemical mechanisms that underlie the observed ballistic effects. Various aspects of the experimental and modeling research program for PPI are described elsewhere (9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). The present report explores progress in the symbiosis of experimental work and a multidimensional, multiphase interior ballistics code, NGEN, that can explicitly model the two-dimensional chamber of a gun (including chambrage), the solid propellant charge, and the inflow of plasma into the gun chamber from an ablative polyethylene capillary.…”

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“…This code has been successfully used for the simulation of unsteady, multi-component, turbulent, chemically reacting (nonequilibrium) flows (18)(19)(20)(21)(22)(23). The code solves the unsteady Navier-Stokes equations, including multicomponent species diffusion, thermal conduction, viscosity (laminar and turbulent), and user-defined nonequilibrium chemical kinetics.…”

“…In this case, the code included a nonequilibrium chemical kinetics mechanism (air-plasma-JA2 propellant) and certain real fluid effects (Coulomb interactions) that are present for ionized gases. For further details on the model and results, refer to the work of Nusca, McQuaid, and Anderson (19)(20)(21). The overall plasma-propellant interaction research program is described by Shaw et al (24).…”