Research Papers: Gas Turbines: Structures and Dynamics

Optimal Failure-Finding Intervals for Heat Shields in a Gas Turbine Combustion Chamber Using a Multicriteria Approach

[+] Author and Article Information
Alejandro Martínez

Department of Mining Engineering,
Pontificia Universidad Católica de Chile,
Santiago 7820436, Chile
e-mail: amartin7@uc.cl

Gloria Lara

Department of Mining Engineering,
Pontificia Universidad Católica de Chile,
Santiago 7820436, Chile
e-mail: gdlara@uc.cl

Rodrigo Pascual

Director of Department of Mining Engineering,
Pontificia Universidad Católica de Chile,
Santiago 7820436, Chile
e-mail: rpascual@ing.puc.cl

Enrique López Droguett

Center for Risk and Reliability,
Department of Mechanical Engineering,
University of Maryland,
College Park, MD 20743
e-mail: eld@umd.edu

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 27, 2014; final manuscript received November 14, 2014; published online December 30, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(7), 072501 (Jul 01, 2015) (6 pages) Paper No: GTP-14-1516; doi: 10.1115/1.4029202 History: Received August 27, 2014; Revised November 14, 2014; Online December 30, 2014

When a component, as heat shields, degrade, two stages can be distinguished. First, a potential failure appears, which could evolve to the second stage and become a functional failure. The time between these two stages is called delay-time, which has been widely studied in literature to determine when to inspect to avoid breakdown. These studies have shown only single analysis criteria to find failure finding interval (FFI). In order to overcome this limitation, we developed a novel strategy to apply multicriteria methodology to optimize FFI. Our approach considers availability, system breakdown risk and reliability analysis from a systemic perspective, studying heat shields as groups, according to their location in the combustion chamber, regardless of age defect. Hence, it is not necessary to check every one of the shields. Our results show an optimal FFI policy subject to a determined breakdown risk level. This analysis may be adaptable to other components that can be grouped together.

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Fig. 1

Proposed methodology

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Fig. 2

Gas turbine heat shields

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Fig. 3

Defect-arrival survival curves for the OS and hub

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Fig. 4

System defect arrival rate

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Fig. 5

Optimal availability for the constrained (Ac) and unconstrained problem (Ao)

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Fig. 6

Sensitivity analysis on delay-time distribution parameters: (a) delay-time shape parameter effect, with a scale parameter of 20,000 and (b) delay-time scale parameter effect, with a shape parameter of 3.5

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Fig. 7

Sensitivity analysis on downtime parameters: (a) inspections downtime effect and (b) system failure downtime effect (df in hours)



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