Generation and Comparison of Sub-idle Speed Characteristics Based on Beta Line

In order to establish the aero-engine starting simulation model, the sub-idle characteristics are generated based on beta line and zero speed line. This paper introduces the definition and drawing method of beta line, and proposes a method of increasing characteristic data based on beta line. In addition, it also introduces how to apply beta value to interpolation method. Aiming at the problem of discontinuous efficiency, the efficiency is converted into specific torque. Finally, the engine performance model with torque and efficiency is compared to verify the effectiveness of the torque method. The research results provide references for the windmill starting of aero-engine.