Subsonic Performance Potential of Ramjets and Ejector Ramjets
Technical rept. Dec 1970-Sep 1971
AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OH
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A method for analyzing the performance of a ramjet engine at subsonic flight speeds is presented. The absence of a known choked point M1 in the engine necessitates an iterative solution. A modified ideal gas analysis is utilized. Considered are the conventional ramjet with liquid fuel injection and an ejector ramjet using vaporized fuel injected into the engine at supersonic velocities. In the latter case, the fuels momentum is significant and the ejector action draws additional air mass into the engine, which must be considered in the analysis. The method presented compares the two engine cycles at several subsonic flight speeds for both JP-4 and propane fuel. The effects of several levels of component efficiencies are considered.
- Jet and Gas Turbine Engines