Blade Section Lift Coefficients for Propellers at Extreme Off-Design Conditions
Research rept. for Oct 96-Sep 97
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD HYDROMECHANICS DIRECTORATE
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The Propeller Force Module PFM code developed by Analytical Methods Inc. AMI for calculating propeller side forces during maneuvering simulation studies requires inputs of propeller blade sectional lift, drag, and moment data. A set of steady two-dimensional foil force data for NACA profiles is normally used by PFM as input. Wake survey data show that the propeller blade sections will encounter large spatial variations in angle of attack during maneuvers. A literature search is conducted to review the effect of unsteady angle of attack fluctuations on two-dimensional hydrodynamic forces. Methods to calculate unsteady hydrodynamic loads are evaluated, and a method selected for use with the PFM code.
- Marine Engineering
- Fluid Mechanics