THE FORMATION OF HIGH TEMPERATURE MINERALS FROM AN EVAPORITE-RICH DUST IN GAS TURBINE ENGINE INGESTION TESTS

Jacob Elms, Alison Pawley, Nicholas Bojdo, Merren Jones, Rory Clarkson

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The ingestion of multi-mineral dusts by gas turbine engines during routine operations is a significant problem for engine manufacturers because of the damage caused to engine components and their protective thermal barrier coatings. A complete understanding of the reactions forming these deposits is limited by a lack of knowledge of compositions of ingested dusts and unknown engine conditions. Test bed engines can be dosed with dusts of known composition under controlled operating conditions, but past engine tests have used standardised test dusts that do not resemble the composition of the background dust in the operating regions. A new evaporiterich test dust was developed and used in a full engine ingestion test, designed to simulate operation in regions with evaporiterich geology, such as Doha or Dubai. Analysis of the engine deposits showed that mineral fractionation was present in the cooler, upstream sections of the engine. In the hotter, downstream sections, deposits contained new, high temperature phases formed by reaction of minerals in the test dust. The mineral assemblages in these deposits are similar to those found from previous analysis of service returns. Segregation of anhydrite from other high temperature phases in a deposit sample taken from a High Pressure Turbine blade suggests a relationship between temperature and sulfur content. This study highlights the potential for manipulating deposit chemistry to mitigate the damage caused in the downstream sections of gas turbine engines. The results of this study also suggest that the concentration of ingested dust in the inlet air may not be a significant contributing factor to deposit chemistry
Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2020
Publication statusAccepted/In press - 9 Apr 2020
EventASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition - London, United Kingdom
Duration: 22 Jun 202026 Jun 2020

Conference

ConferenceASME Turbo Expo 2020
Abbreviated titleGT2020
Country/TerritoryUnited Kingdom
CityLondon
Period22/06/2026/06/20

Keywords

  • turbomachinery
  • erosion & deposition
  • dust ingestion test
  • CMAS
  • sulfidation
  • mineral dusts
  • harsh environments

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