Design Of Helicopter Rotor Electrothermal Anti-icing And De-icing System Of Graphene Flexible Heating Thin-film

Icing often occurs during helicopter flight in the air.As one of the main components of the helicopter’s power system,icing will increase its mass,change its mass distribution,affect the smoothness of its surface,make the boundary layer around the rotor turbulent,increase the helicopter’s flight resistance,and reduce The control efficiency of the helicopter affects the controllability of the helicopter.The falling ice may also damage the fuselage,which creates a safety hazard for the helicopter.Therefore,it is necessary to design the helicopter anti-deicing system.Electric-thermal anti-deicing method is one of the most common way for helicopter to protect it from ice.However,The heating element material of the traditional electric heating anti-icing system is mostly metal.Heating with metal materials has the problems are as follow:the metal is too rigid to seamlessly fit on the surface of the wing;the metal creates heat concentration.In this paper,we use the flexible heating film as heating units to confront the defect of the metal.The flexible heating film has advantages as follow:it can be made of any shapes,the shape is more flexible and free;it can adapt to any surfaces of the heating matrix;the film emits energy through the whole surface which can be attached to the surface of the wing,the thermal conductivity surface between film and heated object will become larger,and has good heat transfer and heat dissipation effects,thereby improving work efficiency;uniform heating can solve the problem of metal heating spot and heat concentration.The main research content of this paper is designing the electric-thermal anti-deicing system based on the graphene flexible heating thin-film,which is expected to improve the performance of the traditional electric-thermal anti-deicing system.The main contents are as follow:(1)Simulate the protection range of anti-deicing system on the helicopter blades,that is,the icing range of the blades.The heating range of helicopter blade spread from root to tip is0%～99%.According to the temperature field distribution of the blade without any heater,the blade is divided into three areas for the installation of the flexible heating film.The heating density of the flexible heating film on the blade increased from the position far away from the hub to the position near the hub in turn,which was 2000W/m~2,3000W/m~2,5000W/m~2and 6000W/m~2.In the purpose of studying the anti/deicing characteristics of the electro-thermal anti/deicing system,we use the material of graphene flexible heating thin-film,we create the model of graphene electric heating system,and we can use the data we found for later experiments.(2)The anti/deicing system using graphene flexible heating thin-film electro-thermal deicing system is placed in environments with corresponding temperatures to provide corresponding thermal density,we found that when the heating power was 2000W/m~2,4000W/m~2,6000W/m~2,and the heating time was 20s with an interval of 10s.Or,the heating power was 6000W/m~2,the heating time was 8s,10s,20s,and the interval time was 10s.The surface temperature changes were observed and measured shows that the feasibility of the designed flexible graphene electro-thermal heating system was verified through experiments.