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Projectile Base Bleed Technology. Part 1. Analysis and Results.
Final rept. Jul 1988-Jul 1991
SCIENTIFIC RESEARCH ASSOCIATES INC GLASTONBURY CT
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Detailed finite rate chemistry models for H2 and H2-CO combustion have been incorporated into a Navier-Stoke computer code and applied to flow field simulation in the base region of an M864 base burning projectile. Results without base injection were obtained using a low Reynolds number k-e. turbulence model and several mixing length turbulence models The results with base injection utilized only the Baldwin-Lomax model for the projectile forebody and the Chow wake mixing model downstream of the projectile-base. A validation calculation was performed for a supersonic hydrogen-air burner using an H2, reaction set which is a subset of the H2-CO reaction set developed for the base combustion modeling. The comparison with the available experimental data was good, and provides a level of validation for the technique and code developed. Projectile base-injection calculations were performed for a flat base M864 projectile at M. - 2. Hot air injection, H2 injection and H2-CO injection were modeled, and computed results show reasonable trends in the base pressure increase base drag reduction, base corner expansion and downstream wake closure location.
APPROVED FOR PUBLIC RELEASE