A preliminary level work has been done to cover the ground for design of a dual-mode ramjet scramjet powerplant for hypersonic vehicles. Various issues in the design of such powerplants have been presented. Brayton cycle suited to the mission requirements have been constructed and analyzed. An analytical approach to aid the initial design of the dual-mode ramjet-scramjet powerplant for a hypersonic vehicle has been laid down. A preliminary geometry of a typical propulsion unit has been proposed, which includes a combustor design study in some detail.
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