Transcript Finite Element Output Bounds - Massachusetts Institute of

Robust Design of a Gas Turbine Engine
Secondary Flow System
Vince Sidwell, Prof. Dave Darmofal
Motivation
–
Gas turbine engine performance and durability relies on the performance of the
secondary flow system.
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The variability in the performance of the secondary flow system appears to be
linked to shortfalls in engine durability.
Two turbine blades from the same
engine. Note the difference in condition.
Research Objectives
–
Determine a method to peform robust design on gas turbine engine secondary
flow systems.
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Determine the characteristics of a robust secondary flow system.
AEROSPACE COMPUTATIONAL DESIGN LABORATORY
Robust Design of a Gas Turbine Engine
Secondary Flow System
Secondary Flow System
Region of Interest
Combustor
Turbine
Disk
AEROSPACE COMPUTATIONAL DESIGN LABORATORY
Robust Design of a Gas Turbine Engine
Secondary Flow System
Example of Variability
Inputs
(All COV = 5%)
COV 


Outputs
Bearing Load
COV = 37%
Blade Oxidation Life
COV = 72%
If the mean life is 10,000 hours, roughly 15%
of the blades will fail before 2800 hours!
AEROSPACE COMPUTATIONAL DESIGN LABORATORY