The fundamentals of ejector propulsion are described and a theoretical treatment of the flow through an ejector is presented in detail. The theory considers the influence of the injestion of boundary layer (or wake) fluids in the ejector and/or its pump, and the limits of performance due to cavitation in the ejector. Methods for the evaluation of the propulsive efficiency, thrust augmentation, and relative power of ejectors are derived from fundamental laws of fluid mechanics. Comparisons of single-stage ejectors with propellers and free jet propulsion systems are made on the basis of propulsive efficiency. Procedures for the evaluation of multi-stage ejector performance are derived and examples are presented to illustrate the performance of two-stage ejectors under stationary and translating conditions.
Underwater Ejector Propulsion Theory and Applications
1976
79 pages
Report
No indication
English
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