Simulations of multiphase particle deposition on a gas turbine endwall with impingement and film cooling

Amy Mensch, Karen Thole

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Replacing natural gas fuels with coal-derived syngas in industrial gas turbines can lead to molten particle deposition on the turbine components. The deposition of the particles, which originate from impurities in the syngas fuels, can increase surface roughness and obstruct film cooling holes. These deposition effects increase heat transfer to the components and degrade the performance of cooling mechanisms, which are critical for maintaining component life. The current experimental study dynamically simulated molten particle deposition on a conducting blade endwall with the injection of molten wax. The key nondimensional parameters for modeling of conjugate heat transfer and deposition were replicated in the experiment. The endwall was cooled with internal impingement jet cooling and film cooling. Increasing blowing ratio mitigated some deposition at the film cooling hole exits and in areas of coolest endwall temperatures. After deposition, the external surface temperatures and internal endwall temperatures were measured and found to be warmer than the endwall temperatures measured before deposition. Although the deposition helps insulate the endwall from the mainstream, the roughness effects of the deposition counteract the insulating effect by decreasing the benefit of film cooling and by increasing external heat transfer coefficients.

Original languageEnglish (US)
Article number111002
JournalJournal of Turbomachinery
Volume137
Issue number11
DOIs
StatePublished - Jan 1 2015

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Gas turbines
Cooling
Molten materials
Surface roughness
Heat transfer
Turbine components
Temperature
Gas fuels
Waxes
Blow molding
Heat transfer coefficients
Natural gas
Coal
Impurities

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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abstract = "Replacing natural gas fuels with coal-derived syngas in industrial gas turbines can lead to molten particle deposition on the turbine components. The deposition of the particles, which originate from impurities in the syngas fuels, can increase surface roughness and obstruct film cooling holes. These deposition effects increase heat transfer to the components and degrade the performance of cooling mechanisms, which are critical for maintaining component life. The current experimental study dynamically simulated molten particle deposition on a conducting blade endwall with the injection of molten wax. The key nondimensional parameters for modeling of conjugate heat transfer and deposition were replicated in the experiment. The endwall was cooled with internal impingement jet cooling and film cooling. Increasing blowing ratio mitigated some deposition at the film cooling hole exits and in areas of coolest endwall temperatures. After deposition, the external surface temperatures and internal endwall temperatures were measured and found to be warmer than the endwall temperatures measured before deposition. Although the deposition helps insulate the endwall from the mainstream, the roughness effects of the deposition counteract the insulating effect by decreasing the benefit of film cooling and by increasing external heat transfer coefficients.",
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Simulations of multiphase particle deposition on a gas turbine endwall with impingement and film cooling. / Mensch, Amy; Thole, Karen.

In: Journal of Turbomachinery, Vol. 137, No. 11, 111002, 01.01.2015.

Research output: Contribution to journalArticle

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