Containment Design And Verification Technology Research On Powerturbine Of Aeroengine

When power turbine rotors of the aeroengine are in failure mode of control system or the power turbine shaft is in loss of load,the power turbine rotors can be overspeed and make the disc fly out broken,which can easily result in engine uncontained accidents.How to prevent this kind of failure has become one of the key technologies of turbine shaft engine safety design.In this paper,containment design research on overspeed power turbine rotor of turbo-shaft engine,a Leaf loss technology is adopted,in which Leaves fly out of tenons with root fracture before the disc is broken,so the disc loses its speed and power.It can provide effective analysis method for aeroengine rotor integrity and casing evaluation in the future and create conditions for engine design and airworthiness forensics.The main research work is as follows:(1)An improved design scheme to meet the overspeed protection requirements of the power turbine blade.Based on the burst speed of the power turbine disc,and consider material and processing of dispersion,mafracture speed of the turbine blade to meet the requirements of overspeed protection was determined.Improved design,fracture speed of the blade reduced and the fracture location of overspeed blades was at the root of the blade tenons.(2)A containment evaluation method and a validation experiment scheme of the power turbine casing.Firstly,tolerance coefficient method and damage potential method were taken to calculate containment performance of Power turbine casing.Secondly,numerical simulation was carried out by LS-DYNA on turbine casing containment for the whole circle blades.An process was simulated that the whole circle blades break off and hit the casing.Also,containment performance was primarily under estimate.