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A THEORY FOR THE PROPELLER-RUDDER INTERACTION

The propeller-rudder interaction problem is studied by means of the unsteady lifting-surface theory. Both surfaces of arbitrary geometry are immersed in a nonuniform flowfield (i.e., hull wake) of an ideal in compressible fluid. The boundary-value problem yields a pair of surface integral equations, the inversion of which is achieved by the so- called generalized lift operator technique, a new approach developed by the authors, in conjunction with the presently used mode-collocation method. The analysis demonstrates the mechanism of the interaction phenomenon by exhibiting the filtering effects of the propeller on the harmonic constituents of the wake which allow the rudder to be exposed only to the blade harmonic and multiples thereof. A numerical procedure adaptable to the CDC 660 computer was developed which furnishes information about ( 1 ) the steady and time-dependent pressure distribution on both lifting surfaces, and ( 2 ) the resultant hydrodynamic force and moments. A limited number of calculations exhibits the importance of some parameters such as axial clearance, number of blades, and harmonic components of hull wake. ( Author )

  • Corporate Authors:

    Stevens Institute of Technology

    711 Hudson Street
    Hoboken, NJ  United States  07030
  • Authors:
    • TSAKONAS, S
    • JACOBS, W R
    • Ali, M R
  • Publication Date: 1968-8

Media Info

  • Pagination: 107 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00007120
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: SIT-DL-68-1284 Final Rpt.
  • Contract Numbers: N600(167) 61303, N00600-67-C-0725
  • Files: TRIS
  • Created Date: Dec 22 1973 12:00AM