00000nam 2200000zi 4500 9.951439 CaOODSP 20250529154904 m o d f cr bn||||||||| 250528e199502##nscad ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre D68-21/37-1995E-PDF Watt, G. D., author. PROP3 : revised compressibility corrections for wind tunnel tests of marine propellers / George D. Watt ; approved by H.M. Merklinger. Dartmouth, N.S. : Defence Research Establishment Atlantic = Centre de recherches pour la défense atlantique, National Defence, Research and Development Branch = Défense nationale, Bureau de recherche et développement : February 1995. 1 online resource (v, 36 pages) : illustrations, graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Technical memorandum ; 95/207 Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references (page 34). "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 to incompressible 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"--Abstract, page ii. Includes abstracts in English and French. Submarines (Ships) Hydrodynamics Mathematical models. Propellers Models. Wind tunnel testing. Sous-marins Hydrodynamique Modèles mathématiques. Hélices Modèles réduits. Essais en soufflerie aérodynamique. Defence Research Establishment Atlantic, issuing body. Canada. Department of National Defence. Research and Development Branch, issuing body. D.R.E.A. technical memorandum ; 95/207. (CaOODSP)9.941838 PDF 1.76 MB https://publications.gc.ca/collections/collection_2025/rddc-drdc/D68-21-37-1995-eng.pdf