THE SOLUTION OF PROPELLER LIFTING SURFACE PROBLEMS BY VORTEX LATTICE METHODS
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF NAVAL ARCHITECTURE AND MARINE ENGINEERING
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Methods are developed to determine pitch and camber corrections for marine propellers with arbitrary blade outline and radial load distribution. The pitch and camber is determined by the requirement that the desired load distribution be obtained with the sections operating at their ideal angle of attack. The method may be used both for homogeneous-flow and wake-adapted propellers. The method is an adaptation of the vortex lattice method developed for wings of arbitrary shape. By replacing the continuous vortex distribution by a lattice of discrete vortex elements, the singular integral equation occurring in lifting surface theory is replaced by a set of linear algebraic equations. From the form of these equations, it is shown that a propeller with symmetrical blades and with mean lines which are symmetrical about the mid-chord has no pitch correction due to lifting surface effect.
- Marine Engineering