Hydraulic performance study of hollow adaptive variable pitch tidal energy turbine

To address the challenges of bidirectional tidal energy utilization efficiency and operational reliability of tidal turbines under low-flow conditions, this paper presents a novel hollow adaptive variable-pitch tidal energy generator based on symmetric airfoil design.In this document, the hydrodynamic performance of the device is analyzed by CFD method, and the energy capture and thrust load characteristics of the turbine are analyzed and discussed. The simulation results show that the power coefficient of the three-bladed turbine is better than that of the four-bladed and five-bladed turbine in the range of 2-4 tip speed ratios at a pitch angle of 10{\deg}, and the optimum power coefficient is 36.8%, which is higher than that of the ordinary axisymmetric wing turbine in terms of its energy acquisition efficiency. Its optimal power coefficient is 36.8%, and its energy efficiency is higher than that of ordinary axial symmetrical wing turbines.