Research On Wake Effect Of Horizontal Axis Tidal Turbine And Its Influence

As a new clean renewable energy, tidal current energy is received more and more attention and application. In recent years, a large number of scientific research organizations and institutions devoted to research in this area in the world. From the theoretical study to the flume tests of single turbine, to the sea trials of single full-scale generation device, all which proved that the ues and the development of the tidal ctrrent energy have achieved initial success. In the future, it is a new challenge to build a large-scale tidal energy farm in the actual sea area. In order to achieve this goal, the research of turbine array layout is a key problem. For the optimization of the layout of multi-turbines array, the first thing need to be done is the research of the recovery of the distribution of flow wake. In this paper, the method of theoretical analysis, numerical simulation and model test combination is used to analyze the influence factors of the flow wake of single turbine.Starting from the theoretical study, this paper summarizes the research status of the tidal current turbine wake, and introduces the impact of the multi-turbine array on the far flow field, the turbulence of near wake flow wake and the far wake recovery law. Based on this, the research contents and methods are confirmed for this paper.Secondly, the paper introduces the blade element theory, momentum theory, the blade element momentum theory, the wake effect and the knowledge in the design of turbine. Then using the CFD software to simulate flow field velocity distribution law, the force analysis of the horizontal axis turbine in different velocitise,.and summarize the influence law. The scale effect in the wake is simulated at the same time. According to analised the wake of different scale turbines, the conclusions will be drawn. In addition, two different rotor models, turbine model and porous disc model, which are used to CFD simulate are researched. Through comparative study from two aspects, analyzeing the force on rotor and the velosity of wake, the feasibility of the porous disc model in CFD simulation will be analyzed.Finally, a model test scheme, whose aim is to get the flow data and the turbine performance parameters in different velositise, is designed. The experimental scheme includes the design of the turbine structure, the installation of the generating device and the calibration of the acquisition system. A model turbine, which diameter is 600mm, and the suspending device are processed out. In addition, the expected experimental results are given. All this work laid a foundation for later flume experiment.