Abstract
A procedure for the numerical analysis of swept and unswept propellers is presented. Two FORTRAN codes have been written to calculate spanwise distributed quantities (such as circulation ) as well as overall performance coefe cients (suchaspropellerefe ciency ).Thespacing ofthepropellerblades may besymmetrical orasymmetrical. Thee uid isassumed to beincompressible,inviscid,and irrotational.However, certain viscosity and compressibility effects are included to enhance accuracy. The propeller blades are represented by bound vortex lines and the wake by trailing vortex lines. In accordance with these assumptions, Biot ‐Savart’ s law is used to determine the induced velocities by integration from the wake vortex sheet. In the modeling of the wake, wake contraction is neglected. The trailing vortex lines are allowed to align themselves in the direction of total (freestream plus induced ) velocity at the blades. However, after the shedding, their direction is assumed to stay constant. The codes are run for a straight propeller for which experimental data exist in the literature, and results are compared. Furthermore a case for a swept propeller and a propeller with asymmetrically spaced blades are investigated.
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