Research Of Horizontal-shaft Telescopic-blade Tidal Current Turbine

Tidal current energy is a kind of renewable energy, the development and utilization of it is a crucial aspect to ease energy crisis. Water turbine is a kind of energy conversion devices,which has mainly three types: horizontal shaft, vertical shaft and axial shaft. In this paper, a kind of horizontal-shaft telescopic-blade tidal current turbine has been studied.A kind of telescopic-blade mechanism has been studied in this paper, degree of freedom analysis of the mechanism has been done, a horizontal-shaft telescopic-blade tidal current turbine has been designed, which blades can periodically extend-retract in operation. FLUENT software has been used in blade fluid analysis, influence of hydrodynamics has been analyzed by evaluating parameters of flow velocity, velocity ratio, and eccentricity. Generated power has been calculated. Velocity ratio curve and energy efficiency curve has been obtained after analyze the data, these provide theoretical foundations for improvement of power efficiency.Mechanical structure design has been done based on the given parameters, details of the telescopic structure has been designed, and kinetic analysis has been done. Driven system and key components structure have been designed according to loading and operating conditions.Static stress analysis of main shaft, hub and rotor terminal flange has been studied by using ANSYS and SolidWorks softwares. Fluid-solid coupling analysis has been done in SolidWorks software, after static stress analysis calculated in SolidWorks Simulation with the pressure loads transmitted from SolidWorks Flow Simulation,the blade fatigue life analysis has been studied on the basis of the analysis of the static strength,reliability of key components has been verified.Structural dynamic analysis of key components has been done, vibration performance of eccentric shaft and rotor has been analyzed, feasibility to solve structural vibration problems in fluid environment of fluid-solid coupling has been verified by comparing dry modes and wet modes of eccentric shaft, it is indicated by results there has no resonance on key components.Mechanism structure has been designed rationally, this will lays foundation for future study.Kinetic analysis of telescopic blades has been done by using SolidWokks Motion software,dynamic behavior of the turbine under variable propeller load has been analyzed. Rationality of the theoretical analysis has been verified by compare theoretical analysis results with simulated structure parameters.