High-temperature profile monitoring in gas turbine exhaust-gas diffusors with six-point fiber-optic sensor array

Franz J. Dutz, Sven Boje, Ulrich Orth, Alexander W. Koch, Johannes Roths

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

In this paper, the deployment of a newly developed, multipoint, fiber-optic temperature-sensor system for temperature distribution measurements in a 6 MW gas turbine is demonstrated. The optical sensor fiber was integrated in a stainless steel protection cable with a 1.6 mm outside diameter. It included six measurement points, distributed over a length of 110 mm. The sensor cable was mounted in a temperature probe and was positioned radially in the exhaust-gas diffusor of the turbine. With this temperature probe, the radial temperature profiles in the exhaust-gas diffusor were measured with high spatial and temporal resolution. During a test run of the turbine, characteristic temperature gradients were observed when the machine operated at different loads.

Original languageEnglish
Article number25
JournalInternational Journal of Turbomachinery, Propulsion and Power
Volume5
Issue number4
DOIs
StatePublished - 2020

Keywords

  • Fiber Bragg grating
  • Gas turbine
  • High temperature
  • Multipoint
  • Regenerated grating

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