变循环发动机地面起动建模及控制规律设计方法

To solve the problem of discontinuous isentropic efficiency of rotating components, a method of using correct torque instead of isentropic efficiency was proposed.The extrapolation method of low speed characteristics of rotating components was given, and the full speed characteristics of rotating components were obtained.A burner stability model considering ignition and burn stability was proposed.Finally, a component⁃level starting model of the variable cycle engine was established.Considering the eight variable parameters of the variable cycle engine, the differential evolution algorithm was used to optimize the starting process of the variable cycle engine in the double bypass and single bypass modes.The results showed that the starting time of the variable cycle engine in the double bypass and single bypass modes was 17.2 s and 12.8 s, respectively.In the double bypass mode, the fuel flow, nozzle throat area and outer bypass area of rear variable area bypass injector need to be adjusted.In the single bypass mode, the fuel flow, nozzle throat area and low pressure turbine inlet guide vane area need to be adjusted.When the free stream Mach number was equal to 0.04, the starting time of the variable cycle engine in the double bypass and single bypass modes was 0.2 s less than the static state.