摘要
现行喘振/失速条款适航审定方法基于单降稳因素叠加的最小发动机状态分析方法,导致高估最小发动机状态的发生概率,无法针对喘振/失速事件做出准确风险概率评估。通过将系统安全概念引入航空发动机喘振/失速适航审定领域,使用蒙特卡洛方法调用发动机气动热力模型构建系统安全评估方法。以某型航空发动机为案例进行基于系统安全评估方法的全局敏感性分析以及风险评估,结果表明:对于喘振裕度影响最大的降稳因素为引气值、循环数以及进口总温,同时全局敏感性分析结果显示降稳因素之间存在耦合影响,系统安全评估结果表明发动机急加速占总飞行时间不超过1.25%时,喘振/失速发生概率是可接受的。
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.
作者
李志平
孙泽锜
朱星宇
赵雨洁
綦蕾
LI Zhiping;SUN Zeqi;ZHU Xingyu;ZHAO Yujie;QI Lei(Research Institute of Aero-Engine,Beihang University,Beijing 100191,China)
出处
《航空动力学报》
北大核心
2025年第8期481-492,共12页
Journal of Aerospace Power
基金
民用飞机专项科研项目(MJZ2-2N21)
国家科技重大专项(2017-Ⅱ-0004-0016)。
关键词
系统安全
喘振/失速
适航审定
蒙特卡洛方法
全局敏感性分析
system safety
surge
stall
airworthiness certification
Monte Carlo methods
global sensitivity analysis
