The first study discussed is concerned with the use of gas injection from the surface of a hypervelocity vehicle such that the effective shape of the body is changed to obtain desired aerodynamic forces and thus desired vehicle control; this type of aerodynamic control represents a gas injection scheme Which might possibly be used for control both inside and outside the atmosphere. The 2nd study is concerned with determining optimal trajectories and control of multi-stage surface-launched interceptors with ranges of several thousand miles and flight times of a few minutes; both propulsive and aerodynamic controls have been considered, and trajectory optimization has been based on minimizing the total interceptor mass ratio. In the aerodynamic control work, studies were made of gas injection into the boundary layer on one side of a thin wedge in steady hypersonic flow. To ascertain the magnitudes of the largest force changes available with blowing, gas injection rates large enough to cause the boundary layer to be blown off the body were considered. Conditions for the desired flight envelope are such that laminar flows could be considered. A fundamental conclusion reach is that relatively large aerodynamic force changes can be obtained with relatively small rates rates of gas injection.


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