For the film heating anti-icing system used in composite aero-engine nose cone

a computational fluid dynamics method was adopted to study the internal jet impingement heat transfer and external film heating efficiency. Two-dimensional axisymmetric algorithm was developed and compared with the results calculated by three-dimensional algorithm. A hot-air blowing experimental apparatus was built up and the infrared thermometer and thermocouple were used to verify the numerical simulation method. The effects of Reynolds number

relative impingement distance and structure parameters of film slot on heat transfer characteristics were comprehensively investigated. Results show that increasing Reynolds number is conducive to improving the internal jet impingement heat transfer and external film heating efficiency. The optimal value of relative impingement distance increases with the increasing Reynolds number

and the optimal value is between 5 and 8 when Reynolds number is between 10000 and 40000. Opening film slot can significantly increase the temperature of exterior surface

and heating efficiency is related to the width and location of film slot. Opening film slot at leading edge can also enhance jet impingement heat transfer.