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Research Papers

Deposition With Hot Streaks in an Uncooled Turbine Vane Passage

[+] Author and Article Information
Brian Casaday

e-mail: casaday.1@osu.edu

Robin Prenter

e-mail: prenter.1@osu.edu

Carlos Bonilla

e-mail: bonilla.12@osu.edu

Michael Lawrence

e-mail: lawrence.312@osu.edu

Carey Clum

e-mail: clum.34@osu.edu

Ali A. Ameri

e-mail: ameri.1@osu.edu

Jeffrey P. Bons

e-mail: bons.2@osu.edu
Department of Mechanical and
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 2, 2013; final manuscript received July 8, 2013; published online October 24, 2013. Editor: Ronald Bunker.

J. Turbomach 136(4), 041017 (Oct 24, 2013) (9 pages) Paper No: TURBO-13-1127; doi: 10.1115/1.4025215 History: Received July 02, 2013; Revised July 08, 2013

The effect of hot streaks on deposition in a high pressure turbine vane passage was studied both experimentally and computationally. Modifications to Ohio State's Turbine Reaction Flow Rig allowed for the creation of simulated hot streaks in a four-vane annular cascade operating at temperatures up to 1093 °C. Total temperature surveys were made at the inlet plane of the vane passage, showing the variation caused by cold dilution jets. Deposition was generated by introducing sub-bituminous ash particles with a median diameter of 11.6 μm far upstream of the vane passage. Results indicate a strong correlation between surface deposits and the hot streak trajectory. A computational model was developed in Fluent to simulate both the flow and deposition. The flow solution was first obtained without particulates, and individual ash particles were subsequently introduced and tracked using a Lagrangian tracking model. The critical viscosity model was used to determine particle sticking upon impact with vane surfaces. Computational simulations confirm the migration of the hot streak and locations susceptible to enhanced deposition. Results show that the deposition model is overly sensitive to temperature and can severely overpredict deposition. Model constants can be tuned to better match experimental results but must be calibrated for each application.

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Figures

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Fig. 1

Volcanic ash deposition on turbine vanes [1]

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Fig. 2

Top portion of TuRFR facility, showing cold dilution jet hole locations

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Fig. 3

Computational grids used in this study. Top section of TuRFR (a) without and (b) with vane cascade installed.

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Fig. 4

Temperature map (°C) at the Plane C vane inlet (a) measured at Plane C in TuRFR and (b) in CFD through projection method

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Fig. 5

JBPS ash size distribution used in experiments. Computations used uniformly sized particles of 11.6 μm diameter, equal to the mass median diameter.

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Fig. 6

Temperature maps (°C) at Plane C without vanes installed for (a) 0% dilution and (b) 5% dilution

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Fig. 7

Post-test photographs of deposition with (a) 0% dilution, (b) 2.5% dilution, and (c) 5% dilution

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Fig. 8

Pressure surface deposit thickness scans (mm) of Vane 2 (top) and Vane 3 (bottom) from (a) baseline test and (b) 5% dilution

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Fig. 9

Midspan chordwise traces of deposition rates for (a) baseline case and (b) 5% dilution, CFD versus experiment on Vanes 2 and 3

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Fig. 10

Computed vane surface temperatures (°C) for (a) baseline case (b) 5% dilution hot streak

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Fig. 11

Computed deposition rates (mm/g) on Vanes 2 and 3 for (a) baseline case and (b) 5% dilution hot streak

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Fig. 12

Comparison of sticking probability versus average vane surface temperature for the original and modified sticking models versus experimental data

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