Simulation And Optimization Of Spatial Sensitivity Of Ring Type Electrostatic Sensor

Gas-solid two-phase flow phenomena are not only widely seen in nature,but also widely used in industrial production,so the measurement of gas-solid two-phase flow parameters is of great significance.Because all kinds of gas-solid two-phase flow are different,and each kind of flow is unstable,it is easily disturbed by temperature,humidity and so on.Therefore,it is difficult to establish the fluid flow model directly and solve the kinetic equation to analyze the velocity of gas-solid two-phase flow.The two-phase flow measurement technology based on electrostatic method has many advantages: low cost,easy detection,convenient maintenance and strong adaptability.However,there are still some unsolved problems,such as the setting proportion of sensor structure parameters,the inconsistency of spatial sensitivity distribution and the calibration of test results.Therefore,the electrostatic charge method is applied to study the induced charge quantity of unit charge in different spatial locations,namely the so-called "spatial sensitivity".Firstly,describes the design of the ring electrostatic sensor and discusses the spatial sensitivity characteristics,its main theoretical basis is that solid particles would generate electrostatic induction charge due to friction and collision in the pneumatic transport process,and according to the analysis of these charge characteristics,designed material and structure of the electrostatic sensor,and signal detection conditioning circuit.Secondly the three-dimensional model of the ring electrostatic sensor and structure parameters by using MAXWELL software set ratio simulation analysis.Analytical expression of spatial sensitivity,the distribution of charge on the electrode in the sensitive area of the sensor is obtained under the circumstances of different space position and the width of the electrode,then the solution of the space sensitivity is obtained,using nonlinear least squares method for the mathematical model of the spatial sensitivity criterion optimization study.The spatial sensitivity characteristics of the point charge and the multi particle are analyzed and compared.Finally the simulation experimental platform,complete the data acquisition,the simulation test of influence factors,such as particle trajectory,air drag,gravity and other factors to optimize the analysis,summarize the analytical expressions of inductive spatial sensitivity.To verify the rationality and feasibility of the optimization model.Through the experiment analysis,the optimization model and the improved space trajectory model combining the sensitivity greatly improves the accuracy of the spatial sensitivity of two-phase flow,the analytical expression of spatial location,spatial sensitivity and particle sensor structure parameter is obtained and laid the foundation for research on spatial sensitivity characteristics of two-phase flow.