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

Study of Microparticle Rebound Characteristics Under High Temperature Conditions

[+] Author and Article Information
C. J. Reagle

e-mail: reaglecj@vt.edu

J. M. Delimont

e-mail: jacobdel@vt.edu

W. F. Ng

e-mail: wng@vt.edu

S. V. Ekkad

e-mail: sekkad@vt.edu
Virginia Tech,
Department of Mechanical Engineering,
Blacksburg, VA 24061

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 27, 2013; final manuscript received July 30, 2013; published online October 21, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(1), 011501 (Oct 21, 2013) (7 pages) Paper No: GTP-13-1195; doi: 10.1115/1.4025346 History: Received June 27, 2013; Revised July 30, 2013

Large amounts of tiny microparticles are ingested into gas turbines over their operating life, resulting in unexpected wear and tear. Knowledge of such microparticle behavior at gas turbine operating temperatures is limited in published literature. In this study, Arizona road dust (ARD) is injected into a hot flow field to measure the effects of high temperature and velocity on particle rebound from a polished 304 stainless steel (SS) coupon. The results are compared with baseline (27 m/s) measurements at ambient (300 K) temperature made in the Virginia Tech Aerothermal Rig, as well as previously published literature. Mean coefficient of restitution (COR) was shown to decrease with the increased temperature/velocity conditions in the VT Aerothermal Rig. The effects of increasing temperature and velocity led to a 12% average reduction in COR at 533 K (47 m/s), 15% average reduction in COR at 866 K (77 m/s), and 16% average reduction in COR at 1073 K (102 m/s) compared with ambient results. The decrease in COR appeared to be almost entirely a result of increased velocity that resulted from heating the flow. Trends show that temperature plays a minor role in energy transfer between particle and impact surface below a critical temperature.

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Figures

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Fig. 1

VT aerothermal rig configured for sand

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Fig. 2

Schematic of instrumentation setup

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Fig. 3

Traverse 8.13 cm upstream of coupon, 533 K

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Fig. 4

Temperature ratio 1.78 cm upstream of coupon

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Fig. 5

Data points with mean and standard deviation lines plotted

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Fig. 6

ARD 20–40 μm results COR versus angle

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Fig. 7

ARD 20–40 μm normal COR versus angle

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Fig. 8

ARD 20–40 μm tangential COR versus angle

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Fig. 9

ARD 20–40 μm COR versus velocity

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Fig. 10

ARD 20–40 μm COR versus KE (1/2 mv2)

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