Study On The Optimal Design Of The Arrangement Of Vertical Axis Tidal Energy Turbine Array

The shortage of fossil energy and the problem of environmental pollution are becoming more and more serious.As a kind of clean energy with abundant resources,tidal energy has been paid more and more attention.In recent years,many countries have developed the technologies of power generation with tidal energy,and various power generation devices have been established.However,at present,the power generation capacity of single turbine generator is difficult to meet the power supply demand of tidal flow power station,so it is urgent to study the arrangement of power flow turbine array to improve the overall energy efficiency of tidal power station.In this paper,the hydrodynamic performance of the flow field under different arrangement of vertical axis power flow turbines is simulated and studied.The impeller is the key part of the energy capture of the turbine.Through the study of the flow field around the impeller and the force analysis,the hydrodynamic performance of the turbine is compared.In order to achieve the purpose of research,two-dimensional numerical simulation of flow field of single unit vertical axis flow energy turbine is carried out based on CFD method.The simplified impeller model is meshed in the appropriate calculation domain.By using FLUENT,the flow field of the impeller of a single turbine is calculated in two-dimensional transient state,and the resultant moment force and the flow field change of the impeller are simulated in different tip speed ratio.The hydrodynamic performance parameters of single turbine are obtained by data processing of simulation results.On this basis,the transient numerical simulation of single row double tidal turbine unit is carried out to monitor the force on each turbine blade and the mutual interference of the flow field formed by the rotating impeller.The effects of the relative arrangement spacing,relative rotation direction and relative position difference angle on the energy capture efficiency of the array unit are mainly studied.Continue to carry on the numerical simulation summary to the single row three tidal turbine unit and single row four tidal turbine unit,and verify the general rule of single row turbine array layout,and then get the relatively better array plan of single row tidal turbine unit.The numerical simulation of the double row tandem turbine unit is carried out to monitor the force on the blades of the front and rear drainage turbines in the wake of the front drainage turbine and the mutual interference of the flow field formed by the rotating impellers.The effect of relative arrangement distance and relative rotation direction on energy capture efficiency of array unit is mainly studied.Based on the array arrangement law of single row parallel double tidal turbine and double row series tidal turbine,the numerical simulation of double row interleaved three tidal turbine is carried out,with the emphasis on the influence law of horizontal arrangement distance and vertical arrangement distance on the hydrodynamic performance of double tidal turbine group and the interaction between the front and rear tidal turbines of double row tidal turbine group.Based on the array arrangement law of double row interleaved turbine and double row tandem turbine,the numerical simulation of three row interleaved six turbine is carried out.The influence of the minimum distance from the first row turbine axis to the third row turbine axis on the hydrodynamic performance of the three row turbine turbine group is studied,and the general arrangement law of multiple tidal turbine group array is obtained,and then the relatively better multiple tidal turbine group layout is obtained.In this paper,the layout optimization of vertical axis hydraulic tidal turbine array is not only a comprehensive study of the first generation of vertical axis power flow turbine array,but also the first optimization of the second generation of power flow turbine array,which provides theoretical support for improving the energy capture of large-scale power flow turbine power station,and has great practical significance for improving the economic benefits of power flow power generation.