Research On Mechanism Analysis And Experiment Of Triboelectric Pneumatic Float Flow Sensor

Flow detection,pressure measurement and temperature detection are listed as the three major detections in the process of industrial production.Among them,flow detection as an important part of energy measurement,has been widely used in various fields such as industrial and agricultural production,people living,military and national defense,and scientific research.In order to solve the problems of complex system wiring,limited service life and high cost caused by the traditional flow sensor mainly relying on power supply or chemical battery,combined with relevant theories of fluid mechanics,a design method of triboelectric pneumatic float flow sensor based on the coupling principle of triboelectric and electrostatic induction is proposed in this paper.And two kinds of triboelectric float flow sensors are designed according to the actual application requirements.The main research contents are as follows:Firstly,the basic working principle of the triboelectric nanogenerator is introduced,and its internal physical mechanism for generating electrical energy is revealed.Then,the single-electrode mode triboelectric nanogenerator is selected as the research object,and whose electrical output performance law is analyzed.Furthermore,the realization mechanism of flow detection of float flow sensor is studied,and the design theory of the triboelectric float flow sensor is carried out.Finally,the variation law of the output open-circuit voltage with the flow of the triboelectric float flow sensor is analyzed,and the detection principle of the triboelectric float flow sensor is illustrated.The simulation model of the single-electrode triboelectric sensing unit is established,and the voltage output law under the longitudinal separation distance and horizontal sliding distance between the triboelectric sensing units are analyzed by COMSOL Multiphysics software,which provided a research basis for the design of the triboelectric flow sensor.Then,the simulation analysis of triangle electrode type triboelectric sensing unit and magnetic flip plate type triboelectric sensing unit are conducted,and the influence of float position change and magnetic roller turnover state on the electric potential distribution law of triboelectric sensing unit was studied respectively,which provided support for the design of subsequent prototype.Combined with the results of theoretical research and simulation analysis,the structure design of the triboelectric float flow sensor is developed.The triangular electrode type triboelectric sensor for pneumatic flow monitoring,and the multifunctional magnetic flap type triboelectric sensor for gas-liquid monitoring have been designed successively.Then,both prototypes of triboelectric sensor is fabricated,the specific structure and size of the prototypes are determined,and the relationship between the output open-circuit voltage of the triboelectric sensing unit and its overlapping area is preliminarily tested,which provided guidance and reference for the experimental research of the triboelectric flow sensor.An experimental test system is constructed,and the experimental researches on output performance under different working conditions,such as flow rate,pressure and liquid level is studied.The detection range,linearity and minimum resolution of the two kinds of triboelectric sensors are determined.Furthermore,the function of the triboelectric sensor is demonstrated,and the accuracy and stability of the triboelectric sensor are evaluated by comparing with the performance of commercial flow/level sensors.In this paper,the output characteristics of the triboelectric float flow sensor are systematically studied by means of theoretical analysis,simulation and experimental research.The research can provide a reference for promoting the practical application of the triboelectric sensor in fluid engineering.