民机燃油箱热模型工程应用研究

Engineering application of thermal model for civil aircraft fuel tank

为满足民机燃油系统和惰化系统研制过程中对燃油箱热分析的多元化需求,采用Matlab/Simulink软件,针对一典型窄体干线客机燃油箱采用集总参数法建立热模型,通过对部分对流传热过程建模优化,同时在各个计算环节融入实际工程数据,最终经试飞数据校核修正,热模型对主油箱的仿真误差小于±2℃。通过对燃油结冰气象条件试飞热分析、燃油系统热气候条件试飞热分析、燃油箱差异对油温影响热分析等多种工程场景的算例研究,展示了燃油箱热模型在民机研制中的典型工程应用。为进一步提升热模型通用性与易用性,结合工程经验,通过关键输入参数化、集成飞行参数自动生成模块和油量分配计算模块,形成具有独立操作界面的工程应用型燃油箱热分析工具,为民机燃油箱热模型的高效工程应用提供一种参考。

In order to meet the diversified needs of thermal analysis of fuel tank in the development process of civil aircraft fuel system and inerting system,the lumped parameter method is used to establish the thermal model of a typical narrow trunk airliner fuel tank by using Matlab/Simulink software.By modeling and optimizing part of the convective heat transfer process,and integrating the actual engineering data into each calculation link,the simulation error of the thermal model for the main tank is less than±2℃after checking and correcting the flight test data.The application of fuel tank thermal model in civil aircraft development was demonstrated through the analysis of fuel icing conditions,such as fuel system thermal climate flight test analysis,and the analysis of the influence of fuel tank configuration differences on fuel temperature,and the typical engineering application of fuel tank thermal model in civil aircraft development was presented.In order to further improve the generality and ease of use of thermal model,combined with engineering experience,through key input parameterization,integrated flight parameter automatic generation module and fuel allocation calculation module,an engineering application type fuel tank thermal analysis tool with independent operation interface is formed,which provides a reference for the efficient engineering application of civil aircraft fuel tank thermal model.