Abstract
The capability of enhancing the efficiency by exploiting the elastic response of composite propeller has been a controversial research point. Contradictory findings are noticed as some studies concluded that composite propeller does not outperform metallic propeller while other succeeded to obtain efficiency improvement at certain operating conditions. This research investigated geometric aspects and hydrodynamic parameters that govern elastic response, and introduced criteria for assessing propeller model, to be used as composite propeller. Parametric study was performed on a case of propeller VP1304 varying two geometric design variables of propeller, namely, pitch and skew distribution. Hydrodynamic twisting moment resultant from pressure load was defined as the effective hydrodynamic output parameter suitable for preliminarily predicting blade structural behaviour. Comparison of moderate and high skew models in term of nondimensional twisting moment showed that increasing blade skew reduced pitching moment at low advance coefficients which is advantageous while; at high advance coefficients, skew resulted in unfavorable increase of de-pitching moment. Accordingly, recommendations for optimization process at both design and off-design conditions was presented.
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