The objective of the HRE-AIM program was to verify the feasibility of integrating the various analytical and experimental data available for the design of the Hypersonic Ramjet Engine and to evaluate the overall engine performance, component interaction and ignition limits for the design selected. The scope of the test program was to determine the following:n(a) Evaluate and optimize supersonic and subsonic combustion mode utilizing heated hydrogen fuel.n(b) Determine ignition limits.n(c) Demonstrate capability to make a transition from subsonic combustion to supersonic combustion and return to subsonic combustion mode.n(d) Evaluate combustion hysteresis.n(e) Determine effect of engine performance when the centerline of the HRE-AIM is at a 3-deg nose-up attitude in respect to the hypersonic slipstream.
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