Experimental Study On Hydrodynamic Performance Of Blade Position-variable Tidal Turbine

The current turbine is a trend-driven turbine.The turbine is the core device for power generation.The conventional vertical shaft turbines have problems such as poor self-starting performance and low energy efficiency.Core devices and vertical shaft turbines with traditional structures suffer from poor start-up performance and low energy efficiency.In order to solve and improve the above problems,some scholars have invented a new structure of the tidal power generation device-blade posture variable tidal current turbine.This article will use the model test method to study the structure of the turbine.This article focuses on the hydrodynamic performance of blade turbine with variable posture tidal current turbine,analyzes the structural characteristics and working characteristics of the turbine,designs and builds a hydrodynamic performance experimental platform,and conducts experimental research on the hydrodynamic performance of turbine blades with variable posture and direction of flow turbines.The result verifies this type of structure turbine is feasibility and superiority.The main research work of this article is as follows:(1)The structure and working principle of the turbine are analyzed,and the hydrodynamic performance of the turbine with variable blade posture,such as self-starting,energy acquisition and shaped energy performance,is theoretically studied.The influence of relevant parameters on the hydrodynamic performance was initially discussed.(2)An experimental prototype of a turbine-vane variable-trend power turbine was designed,and an experimental platform for the hydrodynamic performance of the turbine was built based on a circulating sink.The overall structure of the experimental prototype adopts the parallel arrangement of the turbine rotor and the measurement control system,making full use of the underwater space and solving the problem of underwater sealing.After the prototype was processed and assembled,the prototype was debugged,and the experimental prototype worked well and satisfied the experimental requirements.(3)An experimental study on hydrodynamic performance of blade position-variable tidal turbine has been done.The experimental results show that the blade posture variable tidal current turbine has low start-up flow rate,large starting torque,and good self-starting performance;the water wheel rotor has a unique torque output law and blade movement law;the shroud has obvious concentrating effect and not only improves the turbine The efficiency of energy harvesting also changed the law of rotor torque output and blade motion under reversed flow conditions.The optimal flow coefficient of the experimental prototype was about 0.4,and the capacity coefficient was 0.28-0.35.