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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Characteristics of Volcanic Ash in a Gas Turbine Combustor and Nozzle Guide Vanes

[+] Author and Article Information
Lei-Yong Jiang

Aerospace—The National Research
Council of Canada,
1200 Montreal Road, M-10,
Ottawa, ON K1A 0R6, Canada
e-mail: lei-yong.jiang@nrc-cnrc.gc.ca

Yinghua Han

Aerospace—The National Research
Council of Canada,
1200 Montreal Road, M-10,
Ottawa, ON K1A 0R6, Canada
e-mail: yinghua.han@nrc-cnrc.gc.ca

Prakash Patnaik

Aerospace—The National Research
Council of Canada,
1200 Montreal Road, M-17,
Ottawa, ON K1A 0R6, Canada
e-mail: prakash.patnaik@nrc-cnrc.gc.ca

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 3, 2017; final manuscript received September 19, 2017; published online April 11, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(7), 071502 (Apr 11, 2018) (9 pages) Paper No: GTP-17-1195; doi: 10.1115/1.4038523 History: Received June 03, 2017; Revised September 19, 2017

To understand the physics of volcanic ash impact on gas turbine hot-components and develop much-needed tools for engine design and fleet management, the behaviors of volcanic ash in a gas turbine combustor and nozzle guide vanes (NGV) have been numerically investigated. High-fidelity numerical models are generated, and volcanic ash sample, physical, and thermal properties are identified. A simple critical particle viscosity—critical wall temperature model is proposed and implemented in all simulations to account for ash particles bouncing off or sticking on metal walls. The results indicate that due to the particle inertia and combustor geometry, the volcanic ash concentration in the NGV cooling passage generally increases with ash size and density, and is less sensitive to inlet velocity. It can reach three times as high as that at the air inlet for the engine conditions and ash properties investigated. More importantly, a large number of the ash particles entering the NGV cooling chamber are trapped in the cooling flow passage for all four turbine inlet temperature conditions. This may reveal another volcanic ash damage mechanism originated from engine cooling flow passage. Finally, some suggestions are recommended for further research and development in this challenging field. To the best of our knowledge, it is the first study on detailed ash behaviors inside practical gas turbine hot-components in the open literature.

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Figures

Grahic Jump Location
Fig. 1

Computational domain and mesh of a 60-deg sector of the combustor: (a) the whole mesh, (b) the thermocouple and NGV slot mesh, and (c) the can and NGVs mesh

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Fig. 2

NGV domain and meshes: (a) the whole mesh and (b) the mesh in metal regions

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Fig. 3

Volcanic ash size distribution in weight [32]

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Fig. 4

Volcanic ash particle trajectories for particle size of 15 μm

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Fig. 5

Volcanic ash particle trajectories for particle size of 15 μm

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Fig. 6

Volcanic ash particle trajectories: (a) for the particle size of 5 μm and (b) for the particle size of 40 μm

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Fig. 7

Volcanic ash concentration variation with particle size

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Fig. 8

Volcanic ash concentration variation with particle density

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Fig. 9

Volcanic ash concentration variation with particle inlet velocity

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Fig. 10

Volcanic ash capture efficiency in the combustor

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Fig. 11

Volcanic ash particle trajectories: (a) for the main flow and (b) for the internal cooling flow

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Fig. 12

Volcanic ash particle trajectories: (a) for the main flow and (b) for the internal cooling flow

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