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The United States is making substantial investments in technologies to significantly reduce cost and increase reliability of next generation reusable launch vehicles. Combined cycle propulsion (CCP) systems that synergistically integrate both airbreathing and rocket modes can potentially meet these goals. The performance of air-augmented rocket and ramjet/scramjet modes are dependent on efficient entrainment of atmospheric air, the so-called ejector effect. Many of the proposed engine concepts use rectangular flow path geometries with vertical struts that include embedded rocket nozzles and fuel injectors. The fluid mechanics of these nonaxisymmetric geometries may differ significantly from the classical axisymmetric geometries of past studies. Fundamental experimental studies are required to characterize non-axisymmetric ejector performance and guide development of accurate design methods. Classical axisymmetric ejector theory and its potential application to rectangular geometries are first discussed. A previous UAH ejector mixing study is presented. The design of a modified experimental facility is then described. Finally, a research plan is presented to experimentally characterize non-axisymmetric ejector performance. * Graduate Research Assistant, Member AIAA t Associate Professor, Mechanical and Aerospace Engineering Department, Senior Member AIAA. J Professor, Mechanical and Aerospace Engineering, PRC Director, Fellow AIAA. **Researcher, Rocket Engine Systems Laboratory, Rocket Propulsion Division, Member AIAA. Copyright © 2001 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Nomenclature a* L m critical sound velocity length of mixing tube mass flow rate |
