Measurement of Forces and Spindle Moments on Individual Blades of a Large-Hubbed Propeller

摘要

Axial forces, torque forces and spindle moments were measured on the individual blades of a six-bladed large-hubbed propeller. Two different propeller-blade configurations were tested, and the hydrodynamic characteristics of each were determined over wide ranges of blade pitch and advance conditions. The experimental results indicated the peak forces and moments on propeller blades during emergency operating conditions as well as blade loads and propeller efficiencies during normal cruise operation. Also, by assuming a given blade rake relative to the propeller rotation plane and by vector resolution of the blade forces determined at zero advance for various pitches, it was possible to calculate the extent of propeller sideforce capability during cyclic pitch operation. The test results show that a mission requirement for large-hubbed cyclic-pitch propellers which calls for sizeable side-force capability for maneuvering will dictate the use of large blades that are not efficient in vehicle cruise modes. Recommendations are made for further investigations of blade-configuration and blade-rake effects on both propeller side-force capability and ahead propulsion. (Author)