Performance Analysis Of Heat Power Distribution Characteristic For Strut Of Aeroengine Inlet

As the aircraft engine air intake components,the strut of aeroengine inlet is very important for aircraft. The strut of aeroengine inlet freezes easily in some certain weather conditions. And ice will reduce the engine air intake flow, which reduce the efficiency of engine operation and even cause serious harm to the aircraft flight safety. So carrying out the study of the ice and anti-ice of the strut of aeroengine inlet is very necessary.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 are too large. Based on the strut of aeroengine inlet of a certain type of engine, this paper design an electrical heating anti-icing system which is suitable for the composite materials. And the anti-icing heating power distribution rule is studied, main works are as follows:(1) The harm of aircraft icing and protective method has carried on the simple introduction, the domestic and overseas research progress and methods of anti-icing/deicing problem are summarized. And analyze the characteristics of aircraft composite component electro-thermal anti-icing system and research status, point out the necessity of research on the heating power distribution optimization of the composite component electro-thermal anti-icing system.(2) Summarize the characteristics of domestic and overseas ice wind tunnel, briefly introduces our own laboratory icy wind tunnel of small ejector type including air duct system, spray system and cooling system. Do the calibration of freezing weather parameters such as wind speed, liquid water content of icing wind tunnel test section and water droplets average diameter, which lay the foundation of wind tunnel tests of ice.(3) Design electricity heating anti-icing system for the strut of aeroengine inlet of a certain type of engine, the system uses structure of uniform heat flux density of electric heating, and make the ice wind tunnel test; Do the test to determine the local convective heat transfer coefficient distribution of the surface under the condition of wind speed 30 to 60 m/s; And under the working conditions of coming flow wind speed 30 to 50 m/s, the average particle size of the droplets 40 microns, liquid water content 0.58 g/m3, freezing test is done. The test results under different working conditions match with the numerical simulation results, verifies the rationality of the results of numerical calculation.(4) On the basis of the classical Messinger model, joined the consideration to the water flow and skin thermal conductivity, a new mathematical model is established to calculate the anti-icing heat power of different freezing weather conditions, and based on the genetic algorithm this paper do the optimizing calculation with the purpose of the minimum total heating power, get the results of the surface water film, heat flux and temperature distribution of minimum total power heating under different working condition.(5) In order to verify the optimization results of numerical calculation, the protective area uses block heating structure, and ice wind tunnel test piece is redesigned. And with the goal of minimum total power, ice wind tunnel separately heating test is conducted under the condition of temperature-10 to 5?, wind speed 30 to 50m/s and different liquid water content, the test results accord with the results of numerical calculation, the optimization of the heating power distribution adopted in this paper is reasonable, which shows that thermal anti-icing system load calculation model and optimization method are reasonable.