Optimization design method for accelerated control law of engine life extension considering combustion chamber outlet temperature distribution

This paper proposes an accelerated optimization control law for extending the service life of aero-engine that takes into account the outlet temperature distribution factor (OTDF) of the combustion chamber. Based on the CFD numerical simulation method, a component-level model of a turbofan engine applicable to the entire flight envelope and all states and capable of real-time representation of the thermal pattern temperature of turbine blades is established. A thermal-mechanical fatigue life model of the high-pressure turbine guide vanes is established. The optimization principle of the accelerated control law for extending life is verified through simulation. The method proposed in this paper reduces the maximum temperature of the hot spot in front of the turbine by 15 K and increases the mechanical fatigue life of the turbine guide vanes by nearly 9.23 %. Compared with the traditional accelerated control law optimization method that does not consider extending life, it further reduces the highest temperature of the hot spot in front of the turbine, and the mechanical fatigue life of the turbine guide vanes increases from 4,793 cycles to 5,422 cycles, an increase of nearly 13.12 %.