Coupled Waverider/Trajectory Optimization for Hypersonic Cruise

Air-breathing, waverider-based vehicles are optimized for propulsive and aerodynamic performance along hypersonic cruise trajectories. A scramjet engine is designed using a quasi-one-dimensional model which includes the eects of multiple fuel injection ports, fuel mixing prole, fuel mixing eciency , fuel mixing length, nite rate chemistry, heat transfer, and viscous losses. Aerodynamic calculations are performed to optimize the waverider forebody, inlet ramps, combustor conguration, nozzle, and airframe for a Mach 10 design point. Trajectories (both \standard" and periodic) are optimized for minimum fuel consumption, minimum time-to-target, and maximum range consideration. Trajectories are optimized using a parallelized Dieren tial Evolutionary Algorithm. The eects of vehicle and engine conguration on trajectory optimization for hypersonic cruise indicate that an over-sped design point allows for increased operating margin and improved performance on both steady-state and periodic cruise trajectories with no distinct advantage to either trajectory for the cases examined.

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