LINEARIZED UNSTEADY LIFTING SURFACE THEORY OF A LIGHTLY LOADED PROPELLER IN AN INCLINED FLOW
This report presents the detailed development of a linearized unsteady lifting surface theory for calculating the blade loadings of a lightly-loaded propeller operating in a slightly inclined flow. A numerical approach was developed and programmed to solve the integral equation of the theory which relates the unknown blade loads with the normal-to-the-blade velocities. The numerical procedure applies the mode approach and collocation method in conjunction with the generalizeid lift-operators. The effect of flow inclination on the blade bending moments is demonstrated to be significant. The across-the-disk component of the inclined inflow into the propeller is the primary contributor to the shaft frequency harmonic of blade bending moment. The effect, however, of the helical wake distortion due to shaft inclination adds very little to the amplitude of the shaft frequency blade bending moment.
Stevens Institute of TechnologyDavidson Laboratory, Castle Point Station
Hoboken, NJ USA 07030
- Valentine, D
- Publication Date: 1979-8
- Pagination: 71 p.
- TRT Terms: Aerodynamic lift; Bending moments; Blade loading; Computer programs; Flow fields; Hydrodynamics; Integral equations; Loads; Mechanical loads; Perturbation theory; Potential flow; Potential theory; Pressure; Propeller blades; Propeller shafts; Propellers; Unsteady flow; Variable pitch propellers; Velocity; Wakes
- Uncontrolled Terms: Pressure distribution
- Old TRIS Terms: Bernoulli distribution; Cross flow; Euler angles; Lifting surface theory; Lifting surfaces; Marine propellers; Propeller loading; Propeller shaft inclination
- Subject Areas: Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;
- Accession Number: 00312798
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: SIT-DL-79-9-2064 Final Rpt.
- Contract Numbers: N00014-77-C-0062
- Files: TRIS
- Created Date: May 7 1980 12:00AM