Test Facility for Material Erosion at High Temperature

Tabakoff, W.; Wakeman, T.

doi:10.1520/stp35798s

Cited by 27 publications

(20 citation statements)

References 7 publications

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“…The University of Cincinnati (UC) erosion wind tunnel [12] shown schematically in Figure 1 consists of the following components: particle feeder (A), main air supply pipe (B), combustor (C), particle pre-heater (D), particle injector (E), acceleration tunnel (F), test section (G) and exhaust tank (H). Abrasive particles of a given constituency and measured weight are placed into the particle feeder (A).…”

Section: Experimental Workmentioning

confidence: 99%

“…According to experimental studies of blade alloys and coating materials, their erosion rates are influenced by particle impact velocities and impingement angles and by the operating temperatures [3]. Experimental characterization of material erosion resistance requires special facilities that control particleladen flow around the sample to achieve the desired impact 2 International Journal of Rotating Machinery conditions over the tested samples [12]. Prior TBC erosion test results have demonstrated that electron beam-physical vapor deposited (EB-PVD) TBC erosion rates are an order of magnitude less than plasma sprayed (PS) TBC and that both increase linearly with particles impact velocity [13,14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Deterioration of Thermal Barrier Coated Turbine Blades by Erosion

Swar

Hamed

Shin

et al. 2012

International Journal of Rotating Machinery

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A combined experimental and computational study was conducted to investigate the erosion of thermal barrier coated (TBC) blade surfaces by alumina particles ingestion in a single-stage turbine. In the experimental investigation, tests were performed to determine the erosion rates and particle restitution characteristics under different impact conditions. The experimental results show that the erosion rates increase with increased impingement angle, impact velocity, and temperature. In the computational simulations, an Euler-Lagrangian two-stage approach is used in obtaining numerical solutions to the threedimensional compressible Reynolds-Averaged Navier-Stokes equations and the particles equations of motion in each blade passage reference frame. User defined functions (UDFs) were developed to represent experimentally based correlations for particle surface interaction models and TBC erosion rates models. UDFs were employed in the three-dimensional particle trajectory simulations to determine the particle rebound characteristics and TBC erosion rates on the blade surfaces. Computational results are presented in a commercial turbine and a NASA-designed automotive turbine. The similarities between the erosion patterns in the two turbines are discussed for uniform particle ingestion and for particle ingestion concentrated in the inner and outer 5% of the stator blade span to represent the flow cooling of the combustor liner.

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Section: Experimental Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deterioration of Thermal Barrier Coated Turbine Blades by Erosion

Swar

Hamed

Shin

et al. 2012

International Journal of Rotating Machinery

View full text Add to dashboard Cite

show abstract

“…Erosion wind tunnels control the particles' distribution and velocities in the test section and provide uniform particle impact conditions over the tested surface. 25 In addition, the hot erosion tunnel developed by Tabakoff and Wakeman, 26 and shown schematically in Fig. 5, provides uniform high test-section temperatures for testing turbineblade materials and coating.…”

Section: Coating and Blade Materials Erosion Studies And Facilitiesmentioning

confidence: 99%

Erosion and Deposition in Turbomachinery

Hamed

Tabakoff

Wenglarz³

2006

Journal of Propulsion and Power

287

135

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This paper presents a review of erosion and deposition research in turbomachines and the associated degradation in engine performance caused by particulate matter ingestion. Parameters affecting surface material losses as a result of erosion and development of experimental and analytical approaches to predict flowpath erosion and deposition are discussed. Tests results that quantify the effects of temperature, impact particle composition, impact velocity and angle, and surface material composition are reviewed along with particle restitution data (ratios of rebound to impact velocities and angles). Development and application of models using these data to calculate surface erosion in turbomachinery are described. These models predict particle trajectories in turbomachinery passages to determine impact rates, impact velocities, impact angles and uses the experimentally-obtained erosion data to calculate material losses. Literature on the effects of erosion on turbomachine performance and life is surveyed. Mechanisms of particle delivery and attachment upon arrival at turbomachine flowpath surfaces are also discussed along with experiential models that have been developed to predict surface deposit buildup. Delivery to turbine surfaces can occur as a result of inertial flight, as for erosion, but also through transport mechanisms involving turbulence, Brownian diffusion, and thermophoresis. The particle size range, where each of these mechanisms is dominant for delivery to surfaces, is described. The history and experience of developing models that use these mechanisms to quantify particle delivery rates to turbine flow path surfaces is discussed, along with the use of sticking fraction data to determine the amount of material retained on the surfaces after delivery and the resulting deposit buildup rates. Finally, factors that control whether extreme rates of deposition can occur in turbomachinery are described. . His early experience involved dynamics and control for gyroscopic systems and manned space stations. Later experience concerned developing and applying analytical and experimental methods to evaluate deposition, erosion, and corrosion (DEC) in advanced energy systems (e.g., gas turbines and fuel cells) operating with alternate fuels. Currently, Dr. Wenglarz is Manager of Research at SCIES for a DOE-sponsored program supporting university gas turbine research nationwide. Dr. Wenglarz has over 80 publications and presentations including invited presentations at the Von Karman

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“…Angle Restitution Ratio = e = - (6) Evidence that the out of plane tangential rebound velocity VT as depicted in Fig. 5 exists for all impingement angles tested is manifested in the observed erosion of the test section window.…”

Section: Mmentioning

confidence: 92%

“…In more recent investigations (1,4,51, further insight into the actual mechanism of erosion has been obtained by examining the target surface at high magnification using metallographic techniques and electron microscopy. A detailed description of these test facilities at the University of Cincinnati's Propulsion and Fluids Laboratory can be found in references [11 and [6].…”

Section: Pmentioning

confidence: 99%

Basic Erosion Investigation in Small Turbomachinery.

Tabakoff¹,

Wakeman²

1981

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Test Facility for Material Erosion at High Temperature

Cited by 27 publications

References 7 publications

Deterioration of Thermal Barrier Coated Turbine Blades by Erosion

Deterioration of Thermal Barrier Coated Turbine Blades by Erosion

Erosion and Deposition in Turbomachinery

Basic Erosion Investigation in Small Turbomachinery.

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