Study On Heat Power Distribution Characteristic For Aircraft Anti-ice Components

When a plane flies through the clouds, super cooled droplets imping the surface, which will lead aircraft surface to ice, it has adverse effects on aircraft safety, so the aircraft anti-ice system is the necessary protective device. It found that convection flux and water evaporation heat flux account for the major proportion of anti-icing heat load through analysis anti-icing heat flux. They have a very close relationship with surface convection heat transfer coefficient and water collection coefficient. Therefore, it has an important significance to determine surface convection heat transfer coefficient and the local collection coefficient of anti-ice component.In order to calculate the total anti-icing heating power, uniform surface temperature design assumption were used at present. However, the anti-icing heating power calculation results of this method is too large. For reducing total anti-icing heating power, the anti-icing protection area and the heating power distribution of anti-icing components need to be studied.This paper takes chord length 300 mm NACA0012 airfoil as research object, main works are as follows:(1) Summarized the characteristics of domestic and abroad wind tunnel, combined with the existing icing wind tunnel conditions, improved the tunnel system and calibrated the wind tunnel working parameters.(2) The local convection heat transfer coefficient from the leading edge to the 10% chord length were measured under 30-60m/s wind speed and 0-8 degree attack angle. Test results were compared with the numerical simulation, results show that maximum error between experimental and numerical simulation is less than 13%. The correctness of the simulation calculation is demonstrated.(3) Imping limit position were tested under conditions of flow velocity 30-50m/s, 20μm mean droplet diameter, 0.25g/m3 liquid water content. It found that the error between experimental and numerical simulation is not more than 6%. The accuracy of the simulation calculation is proved(4) In order to obtain the heating power distribution rule of the anti-icing system, protection area used block heating structure, used Kriging model to optimize block heating structure with minimum anti-icing load goal, obtained the optimal heating power distribution of anti-ice surface. Finally, experiment study got the similar heating power distribution with the numerical results.