Theory and Practice of Ejector Scaling,
ROCKWELL INTERNATIONAL COLUMBUS OH NORTH AMERICAN AIRCRAFT DIV
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Procedures are described for utilizing scale models for the development of thrust augmenting ejectors. Physical reasoning and the methods of dimensional analysis are used to argue that the Mach numbers must be matched, but that the Reynolds number is not a relevant parameter if its value is large. Numerical analysis is used to show that almost no change in performance may be expected from the use of cold air jets. Experimental data is presented to support these results. Thus, it is concluded that scale model ejectors powered by cold jets provide a close approximation to the performance of full size ejectors powered by hot jet exhaust flows.