Accession Number:

ADA058088

Title:

Underwater Jet-Diffuser Ejector Propulsion. Real Fluid Effects.

Descriptive Note:

Final rept. 1 Apr 77-31 Jul 78,

Corporate Author:

FLIGHT DYNAMICS RESEARCH CORP VAN NUYS CALIF

Personal Author(s):

Report Date:

1978-08-01

Pagination or Media Count:

96.0

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

Subject Categories:

  • Numerical Mathematics
  • Submarine Engineering
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE