Underwater Ejector Propulsion Theory and Applications.

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1976
Accession Number
ADA033568

Entities

People

  • Jiunn Jenq Wu
  • Morton Alperin

Tags

DTIC Thesaurus Topics

  • Boundary Layer
  • Efficiency
  • Fluid Mechanics
  • Fluid Statics
  • Jet Propulsion
  • Mechanics
  • Propellers
  • Propulsion Systems
  • Test And Evaluation
  • Thrust Augmentation

Fields of Study

  • Engineering

Readers

  • Aerodynamics.
  • Combustion and Flow Dynamics.