基于ISIGHT的某型飞机发动机短舱防火结构设计

Fireproof Structure Design Based on ISIGHT for Aircraft Engine Nacelle

以某型发动机短舱为研究对象,依据CCAR-25-R4适航条款要求,对短舱结构进行了防火区域的界定,为考核短舱防火结构的受力状况,建立短舱后段防火结构有限元模型,完成了5种工况下的有限元分析;综合计算结果,选取其中最严重受力工况,结合发动机的安装和维护需求,开展短舱后段防火结构优化分析;最后以短舱中典型的钛合金防火平板、焊接板2种结构为例,开展了结构防火试验。试验结果表明,防火结构有良好的防火性,满足飞机设计要求。通过以上的结构优化、材料性能试验等流程,最终形成了一套短舱防火结构设计方法,降低了结构重量,加快了设计流程。

A certain type of engine nacelle is taken as the research object,and the fireproof area of the nacelle structure is defined according to the requirements of the CCAR-25-R4 airworthiness clause.In order to assess the force status of the fireproof structure of the nacelle,a finite element model of the fireproof structure in the rear section of the nacelle is established,and the finite element analysis under five working conditions is completed.After that,comprehensive calculation results,and selected the most serious force conditions,combined with the installation and maintenance needs of the engine,to optimize analysis of the fireproof structure in the rear section of the nacelle.Finally,taking the typical titanium alloy fireproof plate and welded plate structure in the nacelle as an example,the structural fireproof test is carried out.The test results show that the fireproof structure has good fire resistance and meets the requirements of aircraft design.Through the above structural optimization,material performance test and other processes,a set of nacelle fireproof structure design methods are finally formed,which reduce the weight of the structure and accelerate the design process.