THE UNSTEADY FORCES DUE TO PROPELLER-APPENDAGE INTERACTION
Abstract
A study is presented of the nature of the unsteady forces in the field of a propeller rotating in the vicinity of an appendage. The propeller is assumed to be one of a high aspect ratio while the appendage although of finite width is assumed to be infinitely long and thus the problem is reduced to a study of the two dimensional flow field around two flat plates. An essential feature of the analysis is that the mutual interference effects of propeller blade and appendage are taken into account. Two approaches are formulated. The rigorous method leads to a set of two simultaneous integral equations which are reduced to a single integral equation involving elliptic integrals. The simplified method employs the technique of substitution vortices which yields explicit analytic expressions for the quasi-state, apparent-mass and wake forces for both the propeller and appendage. Graphs and tables give the magnitude and variation of the propeller and appendage forces as functions of tip clearance, distance and relative size of appendage and propeller.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1962
- Accession Number
- AD0273852
Entities
People
- D. Feit
- J. R. Lurye
- O. Pinkus
Organizations
- Control Data Corporation