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Author(s): R. Ortiz, M. Herran & H. Chalons
Abstract:
Activities performed in the “Structural Design and Dynamic Strength” research
unit of ONERA-Lille mainly aim at analysing the behaviour of aeronautical
structures under dynamic transient loadings (crash, impact, explosion…).
In this
frame, recent studies are performed in collaboration with TURBOMECA
(French turbine manufacturer) to evaluate and develop numerical methodologies
for the analysis of “blade-shedding” events in low-pressure turbines.
Blade-shedding is part of a safety process to preserve turbines disks from
burst in the event of over-speed regime and consists in generating controlled
blades ruptures in order to decrease centrifugal efforts sustained by the disks.
Such a procedure however leads, on the one hand, to impacts from the released
blades onto the turbine rings and containment shields and, on the other hand, to
unbalance transient centrifugal efforts in the turbine, which create severe loads at
the engine mounting components and bolted assemblies.
Keywords:
blade-off, low pressure turbine, Finite Element, Explicit code, blade
shedding.
...
Pages: 9
Size: 2,975 kb
Paper DOI: 10.2495/CMEM090501
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