Research On The Location Of The Flat-film Icing Detector In The Big Aircraft's Aerofoil

Icing phenomenon usually happens on the aircraft which is flying in the air, and it may result in some dangerous accidents. So aircraft icing detection technology is very important for securing aircraft flight safety. The characteristics of the flat-film icing detector are the function of direct detection, high sensitivity of detection, instruction of icing thaw and so on. The flat-film icing detector is located on the aerofoil can reflect the icing on the aerofoil's susceptive position, therefor, it can give alarm signal before icing result in dangerous accident. The located design of the flat-film icing detector is very important for making the detector working on the best and reflecting icing on the aerofoil accurately.This thesis introduces the basic theories about flat-film detection technology and aerofoil icing. According to these basic theories, the hydro-analysis methods for located design are dissertated, and the policies and methods for analyzing the location of the flat-film icing detector are particularly expatiated. This thesis use CATIA V5 software to establish the aircraft's model, and use CFD software to make finite element analysis of the model, finally use Fluent software to simulate the local flow and boundary condition of the location.This thesis use Lagrange Two-phase Flow method to analyze flow character and drip-hit character of the aerofoil. Combine result of simulation and performance of flat-film icing detector to confirm the best geometrical bound of the location. The results show that it need to combine the character of the plat-film icing detector with the characteristic of the aerofoil icing to make the performance of the detector to exert enough. We can attain the best detector location accord with every flight conditions through analyzing the simulation of the aerofoil icing.