Simulation Research And Analysis Of Droplet Coalescence Under Corona Discharge

Artificial rainfall is one of the direct methods to exploit atmospheric water resources,so as to further alleviate water shortages.Compared with the traditional artificial rainfall technology,the artificial rainfall technology catalyzed by charged particle and based on corona discharge has the advantages of low cost,no pollution,and easy implementation.Although this technology has already realized part of the application in the external field,the internal mechanism of the interaction mechanism between charged particles and droplets still lacks a scientific explanation.Therefore,this paper mainly studies the formation and distribution of charged particles and the coalescence process of micron droplets in the background of corona discharge,and aims to provide a reference for the reveal of the mechanism of artificial rainfall technology catalyzed by charged particle.First of all,to solve the problem of charged particles and electric field distribution in a large space in a complex electrode configuration such as a needle electrode,this paper innovatively proposes a corona discharge analysis method based on the combination of hydrodynamic model and ion current equation.Secondly,the microscopic coalescence process of micron-sized droplets under corona discharge was systematically studied.Taking the coalescence time as the evaluation index,the effects of electric field intensity,electric charge,droplet size and initial spacing on the coalescence speed between micron-level droplets were systematically studied.In addition,using collision efficiency as an evaluation index,the effects of electric field strength,electric charge capacity and droplet size on coalescence between micron-sized and nanoscale droplets were studied in depth.The research results show that corona discharge can greatly promote the coalescence between droplets and have an order of magnitude effect.Furthermore,the law of the influence of spatial position on the coalescence process of droplets is obtained.Finally,the test experiment of charged particle number density,discharge current and average charge on droplet was carried out.The high agreement between the simulation results and the experimental results proves the feasibility and accuracy of the analysis method and research work in this paper.The research results in this paper can provide a new method for studying the distribution of charged particles in a large space under a complex discharge electrode,and provide visual data support for clarifying that corona discharge promotes droplet condensation,and is helpful to reveal the mechanism of charged particles catalyzing rainfall.