涡轮电推进系统建模及控制规律设计

A performance simulation model was established to study the working characteristics and control schedule design method of the turboelectric propulsion system. The calculation model of the ducted fan was established based on the component method. The generator and motor performance calculation models were selected based on the motor efficiency map. The electric module calculation model was established based on the object-oriented modelling method. The electric module model was added to the turbofan component-level model，and the co-working equations of the turboelectric propulsion system，namely its performance simulation model were constructed. The reverse method was used to study the working characteristics when the ducted fan thrust is adjusted under the control schedules of different geometric parameters. By adding the thrust balance equation to the performance simulation model and combining the differential evolution algorithm to construct the optimization model of the turboelectric propulsion system，the optimal design method of the control schedule of the turboelectric propulsion system was formed，and the control schedule and performance of the throttle rating of the propulsion system were calculated. The results show that the maximum deviation between the design point performance calculation results of the simulation model and foreign engine calculation software is only 0.22%，which verifies the effectiveness of the modelling method. The ducted fan thrust changes may cause problems such as over-temperature，over-rotation，and surge of the turbofan engine. By jointly adjusting the area of nozzle throat and bypass injector，these problems can be effectively improved. The designed throttle rating control schedule can ensure that the engine is not over-temperature，over-rotation，and has sufficient surge margin，and the specific fuel consumption can be further reduced during the throttle rating. The control schedule also has the characteristics of continuous and monotonous，which is conducive to engineering realization.