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International Journal of Rotating Machinery
Volume 2, Issue 1, Pages 43-50
http://dx.doi.org/10.1155/S1023621X95000194

Measurements of Basic Performances for Waterjet Propulsion Systems in Water Tunnel

Department of Mechanical Engineering, Gunma University, 1-5-1 Tenjin, Kiryu 376, Japan

Copyright © 1995 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Experimental techniques are described in detail for evaluating the system and the unit performances of waterjet propulsion systems in a water tunnel. The measured performances of pump and propulsion of the model systems are in reasonable agreement with the field experiment with prototype craft. Measurements are also made for the losses in the intake and the nozzle. The optimization study of the water jet systems is conducted by simulating the change of the nozzle outlet diameter with the variable nozzle arrangement. It is suggested that the nozzle outlet diameter should be decreased as the craft velocity increases to obtain an optimum propulsive efficiency in a wide range of craft velocity.