Theoretical Analysis of Cycloidal Propellers.
Final rept. 1 May 70-30 Jun 73,
NIELSEN ENGINEERING AND RESEARCH INC MOUNTAIN VIEW CALIF
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A theoretical analysis of a cycloidal propeller was developed which accounts for the detailed structure of the wakes shed from the blades and their influence on blade loading. The analysis was developed for the two-dimensional case infinite blade aspect ratio and programmed for a digital computer. Calculations made over a range of pitch and advance ratio values indicate the wake to have a major influence in reducing the blade loading at low advance ratios. High local blade loadings occur when a blade passes near a wake vortex, and blade stall must be accounted for in the method. Comparisons with model propeller data indicate that the theory predicts the proper trends and levels of thrust, side force, and torque over a wide range of advance ratio and pitch. Author
- Marine Engineering