Scour Around Foundation And Support Structure’s Optimization Design Of Horizontalaxis Turbine Tidal Current Power Generation Device

In order to solve the current situation of energy shortage, more and more peoplepay attention to extracting energy from tidal current and then turns it into electricpower, research on the support structure of gravitational horizontal axis tidal current powergeneration device has important theoretical significance and engineering applicationvalue.hydrodynamic analysis of the integral structure of tidal current power generationdevice using CFD software is done, and by doing these,current load could becalculated. Because of the strong tidal current, research on scour around foundationis necessary, under the conditions of flood and ebb,numerical simulations areoperated to analyse the scour around foundation,and the distribution law of scouraround foundation under the effect of tidal current can be gained.what’s more,thestructural design and numerical simulations of scour protection for the foundation oftidal current power generation device are done by analyzing the simulation results of scouraround foundation.In order to improve the design level and reduce the cost of theproject,optimization design of the support structure is done, and then the optimaldesign parameters are gained. The contents and conclusions of this paper are asfollows:Environmental conditions such as tidal curents and waves are analysed,andturbine operating parameters are calculated by using formulas.The CAD model ofoverall structure of the tidal current power generation device is created and simulations areoperated using CFD software under the conditions of flood and ebb.All these analysesand studies provide reference and prepare for the research of scour aroundfoundation and optimization design of support structure.The geological conditions of the sea area where tidal current turbine will be laidare discussed and analyzed,and the possible maximum equilibrium scour deptharound foundation is analyzed by empirical formula,then numerical simulations areoperated to analyse the scour around foundation using CFD software under theconditions of flood and ebb.based on the result of the above numerical simulations,the distribution of velocity vectors around foundation,the distribution of dynamicpressure around foundation and the distribution of shear stress around foundation aregained,finally the distribution law of scour around foundation is known.Variousmethods and theory of scour protection are studied in this paper, and theirapplication conditions are pointed out,based on the actual engineering conditions inthis paper, we proposed a suitable method for scour protection,then numericalsimulations is done to analyze the scour around foundation which is added scourprotection structure, the results of simulations prove that scour protection structureplay a effective protection role on scour around foundation. In this paper,the parametric modeling of the support structure is established inAWE,and appropriate mathematical model for optimization design is applied,in theprocess of optimization design of support structure,several design variables are set.considering the stress, deformation, vibration characteristics, stability and total massof support structure,multi-objective optimization of support structure is performedby using AWE.With the aid of AWE/DX,which is a Design Optimization moduleattached in ANSYS, iterative calculation is done by using the design of experimentalgorithm,then the database composed of optimization parameters can be gained,according to the optimization goal,the optimal variable parameters are gained fromthe database,the variable parameters comparison before and after optimization showsthat the total mass of the support structure has been effectively reduced, and othertarget variables meet the design requirements.All the research and results in thispaper provide reference and guidance for the project and further research, and haveimportant academic and practical significance.