Research On Piezoelectric Power Generation Based On Flow Around Bluff Bodies In Wind Farms

With the development of global economy,environmental pollution has directly or indirectly affected our living environment and physical and mental health.Therefore,the real-time monitoring of environmental quality is becoming more and more important in our life.In recent years,wireless sensors have been widely used in remote control fields,such as environmental monitoring,manufacturing,agricultural applications,traffic control,life and health,and military reconnaissance due to the development of radio technology.Wireless sensor is real-time monitoring by monitoring a large number of network nodes in the area,and these monitored areas are mostly distributed in the field or remote areas where people are not easy to reach.Aiming at the working environment of wireless sensor network nodes used for environmental monitoring,this paper presents a piezoelectric energy harvesting system based on the flow around a blunt body to supply power for the nodes of wireless sensor networks.The energy harvesting system for piezoelectric power generation based on the flow around a blunt body is placed in the wind field.In this paper,the performance of piezoelectric energy acquisition based on the flow around a blunt body is studied,including the following four aspects:(1)This paper studies the reasons of the Carmen vortex phenomenon caused by the flow around the blunt body in the wind field,analyses the factors affecting the intensity of the Carmen vortex street,and studies the specific distribution of the flow field behind the blunt body in the wind field.(2)According to the related knowledge theory of fluid-solid-electricity three-field coupling simulation,a theoretical model of piezoelectric capture energy based on the phenomenon of blunt body flow in wind field is established.(3)By changing the velocity of the fluid,the size of the flexible piezoelectric plate and the size of the blunt body around the flow,the theoretical model of the piezoelectric energy capture system around the blunt body is simulated by using the software ANSYS.(4)The experimental device of piezoelectric power generation system based on blunt body flow is built.By means of data acquisition card and oscilloscope,the effects of fluid velocity,size of blunt body and size of flexible piezoelectric plate on the wholepiezoelectric energy capture system are analyzed and discussed.In this paper,the influence of different factors on the piezoelectric capture energy around a blunt body is analyzed and discussed by means of the method of simulation analysis and experimental results.It provides an effective way for monitoring wireless sensor nodes to power in wind field.