Modification of effective angle of attack on hydrofoil power extraction

A hydrofoil turbine with simultaneous heaving and pitching is found to have an ability achieve a high power extraction. An OpenFOAM-based numerical model combined non-conformal sliding interface employed study the extraction efficiency of two-dimensional single hydrofoil. The developed validated published experimental results. For Re = 500,000, energy efficiencies are mapped in frequency amplitude domain. results show that maximum can be reached up 39%. effective AoA (angle attack) has significant effect on lift coefficient predicted much better based expression considering angular velocity. Therefore, trajectory calculated iteratively, synchronization between velocity improve very effectively. When profiles changed trapezoid ones, higher achieved. Furthermore, obtained by iteration fitted harmonic function, phase differences motion ranged from 105° 110° when reduced ratio 0.14 1.0, respectively.