基于瞬态流-热-机械网络的涡轴发动机轴断裂超转仿真

In order to meet the rotor integrity requirements in the airworthiness regulations and obtain the overspeed law of an aero-engine under the condition of shaft fracture failure， a method of modeling the engine as a transient aero-thermal-mechanical network was proposed. On this basis， the transient simulation analysis of the rotor overspeed process after shaft fracture failure of the turboshaft engine in the ground takeoff condition was carried out. The effects of shaft failure position，control system and overspeed protection device were considered during the analysis. The results showed that the power turbine shaft fracture can cause the rotor to reach a more severe overspeed condition，if compared with the accessory system power extraction shaft and gas generator shaft fracture. Under the power turbine interstage connection shaft failure condition，the decrease in the rotational speed of the power output shaft caused the control system to increase the fuel supply. The blade-off protection device can be used to limit the sustained acceleration of the rotor.