基于打靶试验的风扇机匣包容能力评估方法  

Containment Capability Evaluation Method of Fan Casing Based on Ballistic Impact Test

作　　者：刘璐璐[1] 罗刚[1] 陈伟[1] 赵振华[1] LIU Lu-lu;LUO Gang;CHEN Wei;ZHAO Zhen-hua(Nanjing University of Aeronautics and Astronautics,Jiangsu Province Key Laboratory of Aerospace Power System,Nanjing 210016,China)

机构地区：[1]南京航空航天大学江苏省航空动力系统重点实验室,南京210016

出　　处：《航空发动机》2019年第1期76-82,共7页Aeroengine

基　　金：国家自然科学基金(51605218);航空动力基金(6141B090305);中央高校基本科研业务费专项资金(NS2016029)资助

摘　　要：为保障飞行安全,航空发动机机匣需具有足够的抗冲击能力以包容高速旋转状态下丢失的叶片。针对某型涡扇发动机对开式风扇机匣包容性评估需求,提出了1种结合真实机匣打靶试验和有限元分析评估机匣包容能力的方法。通过使用真实机匣和真实叶片进行打靶试验获得风扇机匣的冲击损伤情况,并基于ANSYS/LS-DYNA进行了瞬态动力学有限元分析。结果表明:采用Johnson-Cook模型预测的机匣伤形状、尺寸以及叶片残余速度均与试验结果接近,验证了数值分析方法的准确性。采用验证过的数值分析方法开展旋转状态下机匣的包容性评估,发现由于撞击姿态差异和失效模式转变,风扇机匣可以包容以100%工作转速飞出的叶片,但机匣出现长裂纹,接近临界包容状态。所提出的方法可以在不具备部件包容试验条件的情况下,以较方便的形式对机匣包容能力可靠评估。In order to ensure flight safety,the aeroengine casing must have sufficient impact resistance to contain the loss of blades at high speed rotation.In order to meet the needs of an split fan casing containment evaluation of a engine,a new method was proposed to evaluate the casing containment capability in combination with real casing ballistic impact test and finite element analysis.The impact damage of fan casing was obtained by using real casing and real ballistic impact test,and the transient dynamic finite element analysis based on ANSYS/LS-DYNA was carried out.The results show that the casing damage shape,size and blade residual velocity predicted by Johnson-Cook model are close to the experimental results,and the accuracy of the numerical analysis method is verified.The validated numerical analysis method is adopted to launch the casing containment evaluation in rotating state.Due to the difference of impact attitude and the change of failure mode,the fan casing can contain the blade flying out at 100%working speed,but the casing appears long cracks,which are close to the critical containment state.The proposed method can be used to evaluate the containment capability of the casing in a more convenient form without the test conditions of component containment.

关 键 词：风扇机匣 包容能力 打靶试验 数值仿真 航空发动机 

分 类 号：V258[一般工业技术—材料科学与工程]