Water Tunnel Tests of the MK 25 Torpedo with Gas Exhaust through a Vertical Fin

Abstract

This report covers tests of a 2" diameter model of the Mk 25 Torpedo conducted at the Hydraulic Machinery Laboratory of the California Institute of Technology. This work was undertaken as a part of Project NO-176. The purpose of the tests was to determine the effect of the discharge of exhaust through an orifice in the top edge of the vertical fin. Tests were made with and without a shroud ring fitted over the outside of the fins. The model was mounted in the High Speed Water Tunnel with suitable arrangements to pass a measured quantity of gas through the orifice in the fin. Runs were made with varying water velocities, water pressures, and gas quantities. Photographs were taken to show the behaviour of the exhaust gas under these varying conditions.