Designand Experimental Investigation On A Bidirectional Tidal Current Energy Generator System

As the development of the world becomes faster and the population grows incresingly, the energy issue turns out to be a global fundamental problem to be concerned about.Traditional fossil fuels are not only gradually depleted day by day, but also bring more and more environmental pollution. Therefore, the development and utilization of ocean energy has become a hot issue in current scientific research.Combined with the national marine renewable energy development strategy, this subject relies on the Harmonious Island Construction in Shandong province, aiming at Changdao County’s residential electricity problem. A new bidirectional power tidal current energy generating device is designed, which is convenient for installation and maintenance. Theoretical research and experimental verification of the system are done to demonstrate the feasibility of the scheme.This topic is divided into four parts. The first part is the introduction part,mainly introducing the background of the topic,demonstrating the reliability of tidal current energy in many ocean energy sources, and introducing the domestic and international research status of tidal current energy application technology.The second part is about the design and numerical calculation of the tidal current turbine blade. Firstly, based on the survey results of the environmental parameters of the sea area of the project, it analyzes the characteristics of the local tidal current, which demonstrates the rationality of using two-way symmetric airfoil.Then it determines the diameter, tip speed ratio and other parameters of the turbine blade, according to the power requirements of the design task, and completes the design and modeling of the turbine blade. After the design and modeling work is completed, it compares the experiment results with the numerical calculation of its power generation efficiency. The numerical calculation is carried out by using STAR-CCM+, with its powerful grid function, the computational efficiency is greatly improved. By comparing the results of numerical calculation and experimental results, the result shows that the energy conversion efficiency of this two-way symmetrical airfoil is not less than 36.5% under both 0 ° and 180 °current.The third part is the tidal current energy generation system design and numerical calculation. After the design of the turbine blade is finished, determine main dimensions of the main body of the float buoy, plate frame, engine room,pedestal according to the blade size, and then the structural design and engineering drawings are carried out respectively. The weight of the device, the center of gravity,displacement, centre of buoyancy, moment of inertia, inertia tensor and other parameters are acquired from the Solid Works model. It uses STAR-CCM+ software to simulate separately the force and moment of the turbine and main body at different current angles.The fourth part is the design and experiment section of the tidal current energy generating device model. The test model is modeled and manufactured under the scale of the 3:100. While the turbine model can not meet the small scale geometry similarity and gravity equivalent at the same time, it uses a circular plate to measure its resistance, and the main body is tested in the same way on its own. Then it combines the main body and the equivalent disc to complete the mooring test,observing the attitude response of the device under different angles of current.