PROP3 : revised compressibility corrections for wind tunnel tests of marine propellers / George D. Watt ; approved by H.M. Merklinger. : D68-21/37-1995E-PDF

"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.

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