RE-EVALUATING THE THRUST AND TORQUE MEASUREMENT CAPABILITY OF THE MARK I PROPULSION SYSTEM FOR THE DREA STATIC TEST RIG

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Authors
  1. Watt, G.D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Data from the March 1992 benchmark tests of the redesigned propulsion system for the DREA Static Test Rig is re-evaluated following an initial assessment of low quality. These were four quadrant behind-the-boat propulsion test in a large wind tunnel using a 6m long submarine model. Some of the data have systematic error or erratic behaviour. Most of the reasons for these problems ar identified. When the affected data are removed from the data base, the repeatability of the remaining data matches are achieved in open water propulsion tests in a towing tank. The effects of compressibility on the thrust and torque measurements are examined since the propeller is operated at up to 10,000 rpm, where propeller tip speeds exeed Mach 0.5. Theoretical predictions of compressibility effects are shown to be consistent with or larger than those present in the data. These effects are important at low moderate advance ratios, where they are of the order of four percent of the thrust and torque.
Report Number
DREA-TM-95-209 —
Date of publication
01 Apr 1995
Number of Pages
61
DSTKIM No
95-03477
CANDIS No
151933
Format(s):
Document Image stored on Optical Disk;Hardcopy

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