PROP2: A PROGRAM FOR CALCULATING COMPRESSIBILITY CORRECTIONS FOR WIND TUNNEL TESTS OF MARINE PROPELLERS

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Authors
  1. Sjolander, S.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Carleton Univ, Ottawa ONT (CAN) Dept of Mechanical and Aerospace Engineering
Abstract
The report describes the computer program PROP2 which performs a quasi-three-dimensional analysis of the flow through a marine propeller of specified geometry. The program was developed to estimate the compressibility corrections which must be applied to propeller measurements which are made at mildly compressible flow conditions, such as in a wind tunnel, but which are intended to simulate incompressible conditions. The blade-element method is used. Streamtube contraction in the axial direction is taken into account and a simple model is used to estimate the tangential velocity ("downwash") induced by the trailing vortex sheet. The detailed flow around the blade section, at up to 12 spanwise stations, is calculated using a two-dimensional panel method. The Karman-Tsien compressibility correction is then applied to the resulting blade pressure distributions. The analysis can be performed for a velocity distribution at the propeller inlet which varies arbitrarily in the radial direction. The code is written in FORTRAN 77 and has been run on IBM PC-compatible microcomputers. The code could be ported to other platforms, such as workstations, very readily. This report constitutes the Users Manual for PROP2.
Report Number
DREA-CR-92-439 — Contractor Report
Date of publication
01 Jul 1992
Number of Pages
59
DSTKIM No
93-02674
CANDIS No
129169
Format(s):
Hardcopy;Originator's fiche received by DSIS;Document Image stored on Optical Disk

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