Journal ArticleDOI
Effects of Temperature and Particle Size on Deposition in Land Based Turbines
TLDR
In this paper, four series of tests were performed in an accelerated deposition test facility to study the independent effects of particle size, gas temperature, and metal temperature on ash deposits from two candidate power turbine synfuels (coal and petcoke).Abstract:
Four series of tests were performed in an accelerated deposition test facility to study the independent effects of particle size, gas temperature, and metal temperature on ash deposits from two candidate power turbine synfuels (coal and petcoke). The facility matches the gas temperature and velocity of modern first stage high pressure turbine vanes while accelerating the deposition process. Particle size was found to have a significant effect on capture efficiency with larger particles causing significant thermal barrier coating (TBC) spallation durin ga4h accelerated test. In the second series of tests, particle deposition rate was found to decrease with decreasing gas temperature. The threshold gas temperature for deposition was approximately 960°C. In the third and fourth test series, impingement cooling was applied to the back side of the target coupon to simulate internal vane cooling. Capture efficiency was reduced with increasing mass flow of coolant air; however, at low levels of cooling, the deposits attached more tenaciously to the TBC layer. Postexposure analyses of the third test series (scanning electron microscopy and X-ray spectroscopy) show decreasing TBC damage with increased cooling levels. DOI: 10.1115/1.2903901read more
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Journal ArticleDOI
Silicate Deposit Degradation of Engineered Coatings in Gas Turbines: Progress Toward Models and Materials Solutions
TL;DR: In this article, an integrated framework linking thermochemical and thermomechanical models is proposed to predict coating durability in a broad range of deposit compositions, and initial progress toward developing this framework is reported.
Journal ArticleDOI
Mitigation of damage from molten fly ash to air-plasma-sprayed thermal barrier coatings
Andrew D. Gledhill,Kongara M. Reddy,Julie M. Drexler,Kentaro Shinoda,Sanjay Sampath,Nitin P. Padture +5 more
TL;DR: In this article, the authors used lignite fly ash to simulate these conditions and showed that conventional TBCs of composition 93% ZrO 2 ǫ + 7% Y 2 O 3 (7YSZ) fabricated using the air plasma spray (APS) process are completely destroyed by the molten fly ash.
Journal ArticleDOI
Coal Ash Deposition on Nozzle Guide Vanes: Part I—Experimental Characteristics of Four Coal Ash Types
TL;DR: In this paper, an accelerated deposition test facility was operated with three different coal ash species to study the effect of coal ash composition on deposition rate and spatial distribution, and regions of heightened deposition were noted; the leading edge and pressure surface being particularly implicated.
Journal ArticleDOI
Realistic Trench Film Cooling With a Thermal Barrier Coating and Deposition
TL;DR: In this article, the authors investigated the cooling performance of a thermally conducting turbine vane with a realistic film cooling trench geometry embedded in thermal barrier coatings (TBCs) and the effect of contaminant deposition on the realistic trench was studied.
Journal ArticleDOI
Coal Ash Deposition on Nozzle Guide Vanes: Part II—Computational Modeling
TL;DR: In this paper, coal ash deposition was numerically modeled on a GE-E3 high pressure turbine vane passage and two sticking models were used to predict the rates of deposition which were subsequently compared to experimental trends.
References
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Computer Program for Calculation of Complex Chemical Equilibrium Compositions and Applications II. Users Manual and Program Description. 2; Users Manual and Program Description
Bonnie J. McBride,Sanford Gordon +1 more
Book
Convective heat transfer
TL;DR: In this paper, Bibliogr. en fin de chapitres. Index Reference Record created on 2004-09-07, modified on 2016-08-08, created on
Computer Program for Calculation of Complex Chemical Equilibrium Compositions and Applications II. Users Manual and Program Description
Bonnie J. McBride,Sanford Gordon +1 more
TL;DR: The NASA Lewis CEA (Chemical Equilibrium with Applications) program as mentioned in this paper is a two-part report describing the second part of a twopart report described the NASA Lewis-CEA program.