Simulation And Experimental Study Of Piezoelectric Energy Capture Based On Vortex-induced Vibration In Wind Farms

With the development of technology,miniature sensors also play an important role in more operating conditions.The ensuing problem is the energy supply of micro sensors.Traditional chemical batteries are seriously polluted and need to be replaced manually in the later period,which violates the national policy of sustainable development.As a clean and renewable energy source,wind energy has large reserves and wide distribution.In the current development and utilization,it can produce 5.3×10¹³kW·h of electricity in the next year.How to efficiently convert wind energy into mechanical energy and electrical energy has become the research focus of scientific researchers.When a stroke in nature encounters a bluff body blocking flow,vortex-induced vibration is generated.The piezoelectric material is placed behind the bluff body.The piezoelectric effect caused by wind-induced vibration can convert wind energy into electrical energy and store it in miniature sensors through later AC-DC conversion and electrical energy storage.First,the piezoelectric cantilever beam is parametrically modeled using piezoelectric basic theory such as piezoelectric equations,piezoelectric vibration modes,and piezoelectric vibrator support methods,as well as the model of Euler-Bernoulli beams,and the piezoelectric Effect circuit model;on the basis of controlling a single variable,the simulation analysis of the length and width of the piezoelectric cantilever and the different thickness ratios of the piezoelectric layer and the substrate layer will help to achieve the maximum value through the selection of the size of the piezoelectric cantilever.Excellent floating energy effect;combined with this simulation analysis,the simulation flow of piezoelectric cantilever beam is summarized,which plays a guiding role in the piezoelectric cantilever part in the subsequent energy capture device design.Secondly,according to the governing equations of computational fluid dynamics and the related knowledge of bluff body flow,using Fluent software to carry out a simplified two-dimensional plane simulation analysis of different shapes of baffle bluff bodies.Cloud diagram of resistance and pressure velocity;based on ANSYS Workbench platform,the fluid domain is divided using dynamic grids.The bidirectional fluid-structure interaction?FSI?calculation of circular and square columns followed by flexible baffles is performed.The feasibility of the FSI calculation of the flexible body in the wind field is provided,and it provides guidance for subsequent simulation of the trapping energy of the flexible piezoelectric sheet in the wind field.Combined with the frequency of vortex shedding behind the bluff body,the pressure and lift of the bluff body Considering the resistance and the time required to achieve a stable periodic swing,a circular obstructive bluff body is more suitable to participate in the design of subsequent piezoelectric energy traps.Finally,a fluid-solid-electric three-physics coupling model was constructed,and equipment and a piezoelectric energy trap experimental platform were purchased.Based on the existing bidirectional fluid-solid coupling model,a piezoelectric plug-in was introduced,and the ANSYS Workbench platform was used for flow-solid-electrical three physical field coupling simulation;Considering the outdoor use environment after the successful development of this piezoelectric energy capture device,the energy capture device is placed in the playground for vibration energy collection.The trend of the change of the power generation amount with the change of the diameter of the cylindrical bluff body,the incoming flow velocity and the length of the piezoelectric cantilever reached a consensus and was positively correlated with the above three.