The structure of the boundary layer developed on ship propeller blades is significantly influenced by the Reynolds number. The propeller flow regime will determine the radial distribution of vorticity and shear stress within the boundary layer and ultimately, the hydrodynamic loading exerted by the moving fluid particles on the blades. Therefore, when performing propeller model tests, it is desirable to perform the tests at the largest possible Reynolds number to reduce scale effects. The challenge of achieving the highest possible Reynolds number is exacerbated when a 3D printed model from UV curable plastic or resins in utilized since the tensile strength of 3D printed model propellers is in general an order of magnitude lower than full scale NiBrAl casting alloys. In this condition, the Reynolds number can be limited by the maximum hydrodynamic loading on the blades before failure. At high enough Reynolds numbers (Re=5x105) the loads on the model propeller are large enough to cause a residual dynamic bending and twisting response of the model propeller blades. It is believed that this response leads to a discrepancy in the propulsive coefficients when compared to the baseline Wageningen reference propeller (Re=2x106). This study aims to quantify the effect of the dynamic response on the measured propulsive coefficients using a 2-way coupled RANSE CFD-FSI solver, such that the true interaction between the fluid flow and the structural response of the propeller blades is captured using an adequate boundary layer model.
An Investigation of Residual Hydroelastic Response of a 3D Printed Propeller at Low Reynolds Numbers
Husser, Nicholas Alexander, Brizzolara, Stefano, and Adrian Onas. "An Investigation of Residual Hydroelastic Response of a 3D Printed Propeller at Low Reynolds Numbers." Paper presented at the SNAME Maritime Convention, Virtual, September 2020.
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