PROP3: REVISED COMPRESSIBILITY CORRECTIONS FOR WIND TUNNEL TESTS OF MARINE PROPELLERS

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Authors
  1. Watt, G.D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
A computer program is described which predicts the effects of compressibility on marine propeller thrust and torque measurements made in wind tunnels. The flow model is quite simple, combining classical lifting line and momentum theory to estimate thrust and torque. Compressible flow effects are predicted by applying the Prandtl-Glauert compressibility correction to two-dimensional blade section lift predictions. Simple empirical stall models extend the predictions to extreme advance ratios. Supersonic conditions are not modelled. The program supplies the ratios of compressible thrust and torque predictions as the compressibility correction. These corrections are determined primarily by propeller tip Mach number and are shown to be insensitive to errors in the inflow velocity profile.
Keywords
Computer program (PROP 2);Computer program (PROP 3);Randtl-Glauert compressibility correction
Report Number
DREA-TM-95-207 — Technical Memorandum
Date of publication
01 Feb 1995
Number of Pages
42
DSTKIM No
95-02085
CANDIS No
151187
Format(s):
Document Image stored on Optical Disk;Hardcopy

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