Underwater Jet-Diffuser Ejector Propulsion. Real Fluid Effects.

Abstract

The flow properties and performance of a jet-diffuser and a conventional ejector in an underwater environment, including the influence of losses due to inlet blockage, skin friction, incomplete mixing, diffuser separation and nozzle efficiency have been determined. Analytical methods for the evaluation of the loss coefficients from experiments are described. The importance of a proper selection of pump characteristics to optimize the performance of ejectors of any given geometric size are discussed and some examples of the optimization procedure are presented. The influence of performance limitations due to cavitation, viscous dissipation and self-propulsion are discussed with some specific examples which illustrate these limitations as applied to the performance of ejectors with realistic losses. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1978
Accession Number
ADA058088

Entities

People

  • Jiunn-jeng Wu
  • Morton Alperin

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Boundary Layer Control
  • Computational Fluid Dynamics
  • Dynamic Pressure
  • Equations
  • Geometry
  • Mechanical Energy
  • Mechanical Engineering
  • Power Supplies
  • Pressure Distribution
  • Pressure Measurement
  • Propulsion Systems
  • Self Propelled
  • Skin Friction
  • Stagnation Pressure
  • Static Pressure
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Marine Hydrodynamics
  • Regression Analysis.