Accession Number : ADA181901

Title :   A New Pumpjet Design Theory.

Descriptive Note : Technical rept. 1 Jan-31 Dec 85,

Corporate Author : TETRA TECH INC PASADENA CA

Personal Author(s) : Furuya,O ; Chiang,W L

PDF Url : ADA181901

Report Date : 01 Mar 1986

Pagination or Media Count : 82

Abstract : The pumpjet is a unique fluid machine which utilizes 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 increased in recent years, 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 has been established in this FY-85 GHR program. Future work for completing sub-theoriers and incorporating such theories into a unified design theory will follow. (Author)

Descriptors :   *PUMPS, *PROPULSION SYSTEMS, MAPPING, RETARDATION, THEORY, THREE DIMENSIONAL FLOW, TWO DIMENSIONAL, BLADES, CURVATURE, FLOW, GRAPHICS, VELOCITY, WAKE

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE