A New Pumpjet Design Theory.

Abstract

The pumpjet is a unique fluid machine which uses retarded wake flow and produces high propulsive efficiency such as 90%. The existing pumpjet design method is based on a simple two-dimensional graphic method which was used for pump design. As the demand for the speed of underwater vehicles has increased, the existing design method became inappropriate. Effort has been made to develop a new three-dimensional pump design method by combining a blade through flow theory with blade-to-blade flow theory. Such a method requires many supporting sub-theories to be developed. The foundation work for the blade-through flow theory, i.e., streamline curvature method, three-dimensional flow mapping technique, as well as two-dimensional cascade theory, was established in the FY-85 GHR(General Hydrodynamics Research) program. During this FY-86 GHR program, the blade-to-blade flow theory with corrections due to the three-dimensionality has been established. Particularly, the flow skewness which escaped many researchers has been found essential for accurate design of pumpjet. Keywords: computer aided design; Underwater propulsion.

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Document Details

Document Type
Technical Report
Publication Date
Feb 25, 1987
Accession Number
ADA179445

Entities

People

  • Okitsugu Furuya
  • Wen-li Chiang

Organizations

  • Tetra Tech

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Coordinate Systems
  • Data Analysis
  • Experimental Data
  • Flow Fields
  • Fluid Mechanics
  • Geometry
  • Hydrodynamics
  • Poisson Equation
  • Regression Analysis
  • Shape
  • Three Dimensional
  • Three Dimensional Flow
  • Two Dimensional
  • Underwater Vehicles

Readers

  • Aerodynamics.
  • Systems Analysis and Design