加工误差对多级压气机性能影响的不确定性分析

To access the coupled impact of real blade manufacturing errors on the performance of multi-stage axial compressors， This paper improves the global Kriging model by introducing the sparse non-intrusive polynomial chaos method. Subsequently， the surrogate model describing the relationship between manufacturing error and compressor’s aerodynamics is trained at a lower training cost. Finally，the quantitative impact of manufacturing errors on the operational performance and stability margin of a multi-stage compressor are obtained. Moreover，based on Sobol sensitivity analysis，the geometric errors of the compressor stages with the greatest impact on performance and stability margin are identified. The research results indicate that under the impact of manufacturing errors，the mean and standard deviation of the mass flow rate variation at the compressor operating point are −0.47% and 0.064% respectively. The mean and standard deviation of the efficiency variation at the operating point are −0.314% and 0.031% respectively. The leading-edge radius error of the first-stage rotor significantly impact the performance of the operating point， with contributions of 44.83% and 47.06% to the variance of mass flow rate and efficiency respectively. The cumulative contribution of stagger angle errors of each rotor to the mass flow rate at the operating point is significant，with a total contribution rate of 52.77%. The mean and standard deviation of the comprehensive stability margin variation are −0.19% and 0.146% respectively. The comprehensive stability margin is most sensitive to rotor’s stagger angle errors， with a cumulative contribution exceeding 95% from all rotor stages.