Ioint Optimization Design Of Bidirectional Tubular Turbine With Positive And Negative Working Condition

The development of science and technology is accompanied by an increase in people’s demand for energy.At the same time,it also enables people to have a deeper understanding of energy.It is no longer confined to a single form of traditional energy such as coal and oil.The development and utilization of clean energy is getting more and more people value.Among them,the predictability and reliability of tidal energy have been paid more and more attention.The main form of tidal energy utilization is the tidal power station.How to comprehensively consider the relationship between various working conditions,balance the relationship between power generation conditions and pumping conditions is one of the most important problems of two-way tidal power stations.At the same time,comprehensive consideration of power generation conditions and pumping conditions will also help to have a clearer understanding of the tidal power station and facilitate the optimization of multiple conditions.Based on the research results of existing bi-directional tubular units and optimization of pump turbine multi-operating conditions,this paper establishes an optimal design system for two-way tubular unit runner blades.The system includes geometric parametric modeling module,flow field calculation module,finite element analysis module,fluid domain and solid domain coupling module and system optimization.The optimized design variable is the shape of the runner blade,and the objective function is the hydraulic performance of the runner.The efficiency and water pressure and the stress in the structural performance are jointly optimized for the forward turbine working condition and the reverse pump working condition.The multi-objective genetic algorithm is used to realize the joint optimization of the forward and reverse working conditions of the bidirectional tubular turbine on the ISIGHT platform.In this paper,the profile modification of the blade is realized by controlling the four Bezier curve airfoil bone line,so as to realize the parameterization of the bidirectional tubular pump turbine runner blade.The parameterization process of the blade is implemented by UG through the GRIP language.In this paper,the 21 deflection parameters,thickness variables and inlet offset of the blade s seven airfoil bone lines are used to optimize the design variables.The optimization target is the maximum value of hydraulic efficiency,the minimum value of water pressure and the maximum value of structural stress.Joint optimization of turbine operating conditions and reverse pump operating conditions.The optimization results show that the hydraulic efficiency and minimum water pressure of the runner blades are improved after optimization;compared with before optimization,the maximum stress of the runner blades is reduced,and the overall performance of the runner is improved.This optimization provides a basis for the joint optimization of multi-operating conditions of bidirectional tubular turbines,and further demonstrates the feasibility of joint optimization of multiple working conditions of bidirectional tubular units.