基于冷气预冷技术的高马赫数涡轮发动机建模方法及循环分析

For the thermal protection of turbine components of high-speed gas turbine engines，a variable cycle turbofan (VCTF) engine with cooled cooling air (CCA) technology was taken as an example. The library of fuel thermal physical property，and the simulation model of the heat exchanger，the turbine blade cooling，and the combustion chamber with fuel temperature change were established. The iteration simulation model of design point for the high-speed VCTF engine was developed， and the influence on the thermodynamic cycle performance of the VCTF engine with CCA technology was analyzed. Results showed that at the same turbine temperature limits level，the CCA technology can further increase the thrust of the high-speed gas turbine engine. However，the application of high-temperature resistant material into turbine blades was still the key to improving the performance of the high-speed gas turbine engine. For the low-pressure turbine (LPT) without high-temperature resistant material，the relative cooling air bleeds of the LPT stator and rotor increased with the increase of high-pressure turbine (HPT) temperature limits level; after the CCA technology was adopted，the relative cooling air bleed of the LPT stator decreased，and that of the LPT rotor without cooled cooling air further increased. Applying high-temperature resistant material into LPT can reduce this adverse effect.