Investigation On Hail Impact On A Hollow Titanium Fan Blade

Modern aero-engine's hail ingestion can lead to engine blade and other parts damaged,causing the engine surge.Under extreme conditions,melting hail occurs in the combustion chamber,which can cause the engine flameout,causing loss of aero-engine air thrust or unstable thrust.Especially in the process of landing,once stalled,engine is very difficult to restart,leading to serious flight safety problems.The FAA 33.78 terms and conditions of the compliance method including test and numerical simulation.Among them,the need to complete the experiment including the parts and the whole machine of hail.Since both experiment and numerical simulation need the accurate understanding of dynamic mechanical properties of the hail,and hail is a natural form and cannot be directly used for experiment and test,people use artificial simulated hail to replace natural hail.At present,the domestic studies on the dynamic mechanical properties of artificial simulation of hail also is scarce,so test and the calculation methods of development are not mature enough.Consequently,this paper combine experiments with numerical simulation to study and discuss phenomenon of a hollow titanium fan blade's hail ingestion.Based on ASTM international standard and it's complementary,a preliminary experiment was done on the mechanical properties of artificial simulation hail.Based on Hypermesh and ANSYS,pretreatment was carried out on the hollow titanium fan blade for strength and vibration analysis.Based on LS-dyna,hail impact on a hollow titanium fan blade is simulated and the results is analyzed.From different speed,different point of impact and response,this paper fully studies hail ingestion effects on the strength and vibration characteristic of the fan blade.