Advanced Plume Studies
Final rept. 1 OCT 1992-30 JUN 2005
AIR FORCE RESEARCH LAB EDWARDS AFB CA MOTOR BRANCH
Pagination or Media Count:
An advanced rarefied gas dynamic capability to simulate plume flow fields, plume surface interactions at high altitudes, and plume chemical mechanisms will provide the AF with the tools to adequately address recent problems critical to several AF programs. A wide variety of intelligence and missile defense applications require high fidelity reacting plume radiation simulations for target tracking and target discrimination especially in the presence of countermeasures. Developing hypersonic flight and re-entry vehicles can utilize simulations of the nonequilibrium atmospheric shock layer to achieve improved aerothermodynamic performance, propulsion systemvehicle integration, and signature control. Most AF satellite programs require thruster plumespacecraft interaction contamination simulations. In addition, a wide range of AF missions is envisioned for micro- and nano-spacecraft. Micropropulsion is an enabling technology for microspacecraft operations microspacecraft missions involving large spacecraft resupply, repair or surveillance will require maneuverability. The research necessary to meet AF needs in the plumes and micro-fluids arenas share a scientific basis in rarefied gas dynamic modeling and surface collision physics. Direct simulation Monte Carlo DSMC is an important simulation tool for rarefied, nonequilibrium gas flows, including challenging real-world plume cases. This AFRLPRSA research project develops and applies kinetic and molecular-level models of improved physical realism for nonequilibrium processes such as collisional interaction of gases, gas-particulate mixtures, and gas surface interactions that arise in multi-species, chemically reacting rarefied flowfields such as rocket plumes, thruster contamination, plume-plume and plume-atmosphere interactions and low Reynolds number flows. It also eludicates the chemical mechanisms of UV plume signatures and propellant decomposition.
- Physical Chemistry
- Fluid Mechanics
- Combustion and Ignition