Study On Electrothermal Anti-icing And De-icing And Mechanism Of Heat Transfer Of Ice Melting Phase Change

Ice accretion on the aircraft and aero-engine is one of the biggest obstacles for the human beings to seek a safe flight.The icing on the aircraft and aero-engine has brought a lot of disasters,not only the economic losses,but also threat to the safety of human life.So,people invest a large amount of manpower,material and financial resources to study the flight icing phenomenon and anti-icing and de-icing method.At present,most of the researches are focused on the numerical simulations and the ground experiments.In this paper,some researches have been carried out,including the establishment of the research plat form,simulation of the phase change process of ice melting,study of the heat transfer characteristics of ice melting,study of the process of ice shedding at different positions on the outer surface of airfoil and study of the feasibility of a new anti-icing and de-icing method with electromagnetic induction heater.Firstly,numerical simulation research of electro-thermal anti-icing and de-icing is carried out.Based on the characteristics of numerical simulation,both of the basic process of numerical simulation and the setup of parameters are improved.The heat source arrangement of the strut electrothermal anti-icing and de-icing system is optimized.And the effects of velocity,temperature and liquid water content on anti-icing and deicing are studied.Secondly,the experimental research of electro-thermal anti-icing and de-icing is carried out.The effects of heater arrangement,heater power,liquid water content and temperature on anti-icing and de-icing are studied.Thirdly,different icing dimensions are classified according to the direction of heat transfer.The concept of quasi-plane icing surface is proposed on the basis of previous research results.Different dimensional ice melting phase change processes are studied on the quasi-plane icing surface.The melting model based on the enthalpy-porosity method is introduced to track the ice melting process.Furthermore,the effects of ice density and porosity on the ice melting phase change process are also studied.Fourthly,both of the heat transfer characteristics of ice melting and the process of the ice shedding are studied by experiments.The characteristics of temperature are studied in the process of ice melting under different heater power and heating time.The characteristics of temperature are also studied in the process of ice shedding at different positions on the icing surface.The time of ice shedding can be determined by the temperature characteristics.Finally,during the research,it is found that the traditional electric heating method has some problems such as low utilization rate,larger thermal inertia and poor controllability.In order to improve the anti-icing and de-icing efficiency,the electromagnetic induction heating method is used in the anti-icing and de-icing system as heating source to replace the traditional heating source.An induction coil of the electromagnetic induction heater is designed.And anti-icing and de-icing experiments are carried out with this coil as the heating source in the anti-icing and de-icing system.The experimental results show that the electromagnetic induction heating anti-icing and de-icing system can achieve the purpose of removing the ice by consuming a small amount of heat.This new anti-icing and de-icing method has the advantages of fast response and low energy consumption.It is worth applying in the electro-thermal antiicing and de-icing system.