Accession Number:

ADA179445

Title:

A New Pumpjet Design Theory.

Descriptive Note:

Technical rept. 1 Jan-31 Dec 86,

Corporate Author:

TETRA TECH INC PASADENA CA

Personal Author(s):

Report Date:

1987-02-25

Pagination or Media Count:

59.0

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 GHRGeneral 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.

Subject Categories:

  • Theoretical Mathematics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE