Modeling Additive and Hostile Particulate Influences in Gun Combustion Turbulent Erosion
Abstract
Research on fundamental mechanisms of erosion is the incentive for development and application of the numerical methods discussed here. The methods link particulate statistical dynamics to continuum turbulent reactive flow and solid material dynamic (erosive) surface response. The modeling incorporates calculated thermal, chemical, and mechanical dynamic processes in solid, liquid, gas, and mixed phases. The calculations match the multicomponent, turbulent, chemically-reactive wall boundary layer with the unsteady eroding interface boundary using microscopic transport, accommodation and energy distribution sub-models. Gas-borne particle motions are coupled to the turbulent flow in the inertial core and to the dissipative flow near the wall surface using two basically distinct numerical methods: (1) particulate turbulent gas flow, statistical dynamics and trajectory determination in the inertial core region; (2) solution of the detailed boundary layer heat and mass interface transport with boundary conditions and exchange properties modified for the unsteady influence of particle distributions and probabilistic surface dynamic response. Force, energy and motion coupling between particles and gas is assumed weak, with negligible back-influence from particles to gas flow structure. The present analysis is thereby restricted to relatively low mass loading which may be found in the ullage region between propellant bed and bounding walls, propellant face and projectile base as well as between propellant base and breech. Particle-to-gas relative fluctuational velocities are obtained at incremental time steps by numerical randomization. They are subject to the constraint that their ensemble averaged motions are, in sum, equivalent to the locally, apriori computed mean turbulent intensity. Results also include some preliminary molecular solid lattice statistical dynamics simulations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 27, 1979
- Accession Number
- ADA363842
Entities
People
- A. C. Buckingham
Organizations
- University of California