Vortex rope mitigation with azimuthal perturbations: A numerical study

Abstract A novel method to mitigate the rotating vortex rope is investigated numerically on a propeller turbine using ANSYS CFX. Pulsating momentum injected in horizontal plane diffuser cone from four evenly spaced jets. Three mitigation strategies are tested; M1 which perpendicular axial flow direction, M2, exhibit 12 degree angle against tangential velocity cone, and finally M3, same as M2 but at 15 % higher rate. It shown that attempts M1, M3 decrease amplitude of mode by 51%,96% 97%, respectively. The plunging mode, other hand, increase for all attempts. However, unperturbed RVR an order magnitude smaller than thus, overall pressure fluctuations decreases significantly. more efficient attempt explained contour show significantly reduced downstream injection between injections, not case M1.