| Citation: | LI Zhiping, SUN Zeqi, ZHU Xingyu, et al. Safety assessment method for aero-engine systems based on surge/stall[J]. Journal of Aerospace Power, 2025, 40（8）：20230187 doi: 10.13224/j.cnki.jasp.20230187
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The current airworthiness certification method for surge/stall clauses based on the minimum engine state analysis method stacks single destabilizing factors and overestimates the probability of minimum engine state occurrence. It cannot provide accurate risk probability assessment for surge/stall events. To address this issue, the concept of system safety was introduced into the field of aero-engine surge/stall clause airworthiness certification, and a system safety assessment method based on global sensitivity analysis of aero-engine was constructed using a Monte Carlo method to call the engine aerodynamic-thermal model. The safety assessment process was demonstrated using a specific aero-engine model, which identified the pilot gas value, cycle number, and total inlet temperature as the most influential destabilizing factors on the surge margin, and the distortion range and intensity of the circumferential total pressure distortion as secondary factors. The global sensitivity analysis revealed a coupling effect between the distortion range and intensity, which increased the degree of their respective influences on the surge margin. The results of the system safety assessment indicated that the probability of a surge/stall event is acceptable when the engine sharply accelerates for no more than 1.25% of the total flight hours.
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