Dynatnic phenomena in 'ratn-accelerator', a ramjet-i1l-tube concept for accelerating projectiles to ultra high velocities, have been investigated analytically atld compared with the experitnental investigations reported in open literature. nle projectile resembles tlle centrebodyof a conventional ramjet, but travels through a stationary tube filled witll a mixture of gaseous fuel atld oxidizer. nle energy release process travels with a projectile i1lside tlle accelerator tube. nle characteristics of subsonic combustion, thermally-choked mode of propulsion, which is capable of increasing tIle velocity up to Chaptnatl-Jouguet (C-J) detonation velocity of tlle propellant mixture used in ram-accelerator tube, have been studied. The ram-accelerator with a fIXed diffuser area ratio operates witIl different initial velocities for different propellatlt mixtures. Propellallt mixture with CO2 as diluent is used for velocity range -770-1150 tn/s; propellant mixture with nitrogen a.~ diluent is used for velocity range -925-1450 tn/s atld that with helium as diluent is used for velocity range -1500-2000 m/s. Mixtures of propellants witll different diluents in varying degree of proportions, giving rise to different acoustic and C-J detonation speeds, have been i1lvestigated to evaluate tlleir suitability in tlle ratn-accelerator divided i1uo several segments.
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