基于涡轮增压系统模型的发动机安全影响因素敏感性分析  

Sensitivity analysis of engine safety affecting factors based on the turbocharging system model

作　　者：李果 王梓潞 滕依达 许通格 LI Guo;WANG Zilu;TENG Yida;XU Tongge(Institute of Science and Technology,Beihang University,Beijing 100191,China;School of Energy and Power Engineering,Beihang University,Beijing 100191,China;Tianmushan Laboratory,Hangzhou 311115,China)

机构地区：[1]北京航空航天大学科学技术研究院,北京100191 [2]北京航空航天大学能源与动力工程学院,北京100191 [3]天目山实验室,杭州311115

出　　处：《中国民航大学学报》2025年第1期1-10,共10页Journal of Civil Aviation University of China

基　　金：国家自然科学基金项目(U2233213)。

摘　　要：采用涡轮增压系统可以有效地恢复发动机高空动力性能,提高通用航空器的工作升限,但在改善发动机性能的同时,其安全性也应引起足够重视。为提高航空活塞发动机涡轮增压系统的安全性并对实际运行提供建议,本文基于模型的系统安全性分析、“V”型安全性分析、响应面分析法(RSM,response surface methodology)与Sobol因子敏感性分析方法,构建了以Rotax 914为原型的发动机整机准维模型与拟合方程进行全局敏感性分析,对航空活塞发动机涡轮增压系统性能的不同安全影响因素的敏感性进行分析与比较。结果表明:海拔高度的敏感性指数远高于其他因素;进气阀直径的敏感性指数高于废气阀直径但二者在量级上相近;在正常运行环境下空气过滤器的有效长度对发动机涡轮增压系统几乎不产生影响。因此,在实际运行中可以根据分析结果调整安全影响因素的变化范围,降低关键因素的不确定性,从而进行高效、直观的安全分析。Adopting turbocharging system can effectively restore the high-altitude power performance of the engine and im-prove the working ceiling of general aircraft.However,while improving the engine performance,its safety should also be given sufficient attention.In order to improve the safety of the turbocharging system of aviation reciprocat-ing engine and provide suggestions for actual operation,this paper combines model-based system safety analysis,“v” shaped safety analysis,response surface methodology(RSM),and Sobol factor sensitivity analysis method,and taking Rotax914 as prototype,a quasi dimensional model for the entire engine and fitting equation are constructed for global sensitivity analysis.The sensitivity of the turbocharging system performance of aviation reciprocating en-gine to different safety affecting factors are analyzed and compared.The results indicate that the sensitivity index of altitude is much higher than other factors,and the sensitivity index of intake valve diameter is higher than that of exhaust valve diameter but they are similar in magnitude.The effective length of air filter has almost no effect on the engine turbocharging system under normal operating condition.Therefore,during the actual operation,the change range of safety affecting factors can be adjusted according to the analysis results,in order to reducing the uncer-tainty of key factors and conducting efficient and intuitive safety analysis.

关 键 词：航空活塞发动机 涡轮增压系统模型 响应面分析法(RSM) Sobol因子 敏感性分析 

分 类 号：V234.1[航空宇航科学与技术—航空宇航推进理论与工程]