| In recent years,corona discharge ionic wind has been more and more widely used because of its advantages of simple structure,no rotating mechanical parts,and no noise.In terms of enhanced heat dissipation,it can be applied to air convection heat dissipation for important components of integrated circuits;in waste disposal,it can be used for electrostatic dust removal,desulfurization,off-sales,and processing of heavy metals;in household appliances,it can be used for noiseless air conditioning,Humidifier,range hood,etc.;in the field of aviation industry,it can change the flow around the fuselage to achieve the purpose of controlling the separation of the airflow of the wings,improving the lift of the aircraft,and increasing the angle of attack.At present,the experiments and theories for ionic wind are mainly based on the steady state.In this paper,the characteristics of corona discharge ionic wind flow field are taken as the research direction,and the representative needle-plate electrode structure and needle-barrel electrode structure are selected as the research objects.The resulting time-resolved dynamic process,steady-state flow field distribution,U-I characteristics,dynamic power and efficiency were studied.Specific work content includes:(1)Designed ionic wind generating device and measuring system.The generator adopts a needle-plate electrode structure to simulate the internal electric field distribution;it uses a highspeed CCD camera,laser and PIVlab analysis software to build a PIV system by itself,which can realize the contactless measurement of the ionic wind flow field in a two-dimensional plane,with fast speed,The advantages of comprehensive measurement and will not affect the characteristics of the original flow field.(2)Using a negative high-voltage DC power supply,study the process of ionic wind from constant generation to development and then to stability,and obtain the flow field change process of the development process;at different voltages,the change process of the ionic wind wind head speed is studied,The relationship between ionic wind head speed and voltage is obtained.(3)The steady-state flow field of corona discharge ionic wind is studied.Combined with particle image velocimetry measurement and PIVlab and MATLAB software analysis,the steady state velocity vector distribution diagram and velocity distribution law of ionic wind at10 k V are obtained;the discharge current at different voltages is measured to obtain the U-I characteristic curve of ionic wind;design needle-tube The electrode structure measures the discharge current at different voltages and the ionic wind speed at the outlet,calculates the input electrical power,ionic wind dynamic power and ionic wind generation efficiency,and analyzes possible technical approaches to improve ionic wind efficiency. |
