Design Of Flexible Piezoelectric Generator System Based On Karman Vortex Effect

The energy issue has always been an important issue that restricts the development of human society.As the social energy shortage becomes more and more serious in today's society,people's search for new energy sources has also accelerated.Ocean energy a clean,pollution-free and inexhaustible source of energy,has favored by many researchers.However,how to convert ocean energy into electricity is still a huge problem.Piezoelectric materials as a new type of electromechanical conversion materials can convert the mechanical vibrations in the environment into electrical energy.It has the advantages of no pollution and simple structure.More and more researchers in related fields have increased the use of piezoelectric generation,to increase its conversion efficiency,simplify its device structure,and reduce production costs.In this paper,a flexible piezoelectric generator based on the Karman vortex effect is designed.It is a new exploration of the ocean energy extraction technology.Firstly,The article introduced the importance of marine energy as a new energy development and the research background of the project,and introduced the current research status of marine energy piezoelectric generation at home and abroad,and analyzed the working principle and advantages of existing piezoelectric generators.Disadvantages,it is proposed that the use of flexible piezoelectric materials for power generation is feasible and has great potential for development.Secondly,the theoretical basis of the flexible piezoelectric generation based on the Karman vortex street effect is analyzed and discussed.The hydrodynamic parameters,piezoelectric constitutive equations and other related areas of the fluid are introduced,and a reasonable flow field model and piezoelectric model are found.Then,the finite element analysis of the power generation capacity of the flexible piezoelectric generator based on the Karman vortex street effect is performed.The simulation of the hydrodynamic parameters of the Karman vortex street effect of the single cylinder and tandem double cylinder downflow field is completed first,and the different flow rates of the entire device,different cylinder diameters,and different flexible piezoelectric slice sizes are separately performed.Comparing the magnitude of the voltage capability under different conditions.Finally,the experiment platform was set up.The variable frequency water pump was used to provide power source with different flow rates.The glass sink flow field was constructed.The voltage generated by the flexible piezoelectric slice was collected by the data acquisition card and compared with the simulation results to verify the correctness of the article's research and analysis.