Comparison between the acoustic signatures of a conventional propeller and a tip-loaded propeller with winglets

The Ffowcs-Williams and Hawkings acoustic analogy is utilized to reconstruct the signature of two marine propellers with without winglets at tip their blades. database from a large-eddy simulation study exploited conducted on computational grid consisting about 5 × 10 9 points. results this demonstrate that tip-loading propeller successfully improves its performance in terms thrust efficiency propulsion. Meanwhile, despite use blades, reinforced. This result mainly found attributable loading component sound, originating fluctuations hydrodynamic pressure surface propellers, particular outer radii: they are significantly higher tip-loaded case. In contrast, non-linear sound similar between cases, as similarity wake developments instability behaviors structures shed by conventional propellers. However, also case, coming latter slightly higher, due stronger vortices.