Accession Number : ADA141069

Title :   Computation of the Tip Vortex Generation Process for Ship Propeller Blades.

Descriptive Note : Final rept. on SBIR Phase 1,

Corporate Author : SCIENTIFIC RESEARCH ASSOCIATES INC GLASTONBURY CT

Personal Author(s) : Govindan,T R ; Levy,R ; Shamroth,S J

PDF Url : ADA141069

Report Date : Apr 1984

Pagination or Media Count : 53

Abstract : A forward marching computation procedure has been used to compute the tip vortex generation process for ship propeller blades. Governing equations are derived through approximations to the Navier-Stokes equations made relative to a curvilinear coordinate system fitted to and aligned with the flow geometry. The approximations permit a forward marching solution of the governing equations thereby providing an economical and accurate method to compute many three-dimensional viscous flows. Under the Phase I effort of the study, the forward marching procedure was extended to rotating coordinate systems. A geometry package was developed to describe the propeller tip and generate a suitable computation grid. Three test cases were run demonstrating the capability of the forward marching procedure to compute the tip vortex generation process. The capability of the method to compute the low pressure region at the center of the tip vortex was also demonstrated. The low pressure region is susceptible to cavitation. (Author)

Descriptors :   *PROPELLER BLADES, MARINE PROPELLERS, FLOW FIELDS, NAVIER STOKES EQUATIONS, VORTICES, VORTEX GENERATORS, CAVITATION, VISCOUS FLOW, PRESSURE DISTRIBUTION, HYDRODYNAMIC CHARACTERISTICS

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE