Simulation Experiments of Reacting Two-Phase Flow
Final rept. Feb 1984-Apr 1987
EUROPEAN RESEARCH OFFICE LONDON (UNITED KINGDOM)
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A gas gun simulator that permits the generation of relatively clean, two-phase, reacting flows with realistic ballistic gas pressures and temperatures has been developed. This gas gun is driven by the combustion of the gas mixture 3H2 O2 8He. With this gas propellant mixture, the gas gun is capable of simulating both the interior and transitional ballistic flows of medium caliber weapons. In the experiments, emphasis has been given to the study of reacting muzzle flows. The reason for this was to investigate, in accordance with the contract officer, primarily the basic muzzle flash phenomena. It is shown for the first time that hydrogenoxygen reactions alone can be suppressed by the addition of conventional gun muzzle flash suppressants, i.e., by alkali salts which are added to the propellant gases. These results support the supposition used by the modelling community that only the hydrogen and possibly the CO chemistry are needed to describe the kinetics pertinent to gun muzzle flash and its chemical suppression by inhibiting alkali salts. Because of the importance of the simulation experiments, a further three years program is envisaged. Keywords Ballistics Simulators Interior Transitional Combustion Hydrogen Validation Experiments Muzzle Flash Parameters Flow.