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Nathanael Wendel Master's Thesis.pdf (3.25 MB)

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Exploration of the Role of Mineral Chemistry Toward Dust Deposition in Turbine Engines with Synthetic Mineral Dust Blends

Wendel, Nathanael J
http://orcid.org/0009-0009-6840-7265
http://rave.ohiolink.edu/etdc/view?acc_num=osu1681989012671083

Abstract Details

2023, Master of Science, Ohio State University, Aerospace Engineering.
In this thesis there are two main studies. The first is an assessment of the role of mineral composition for Air Force Research Laboratory Test Dust (AFRL) for deposition in a realistic gas turbine engine environment. The second is an attempt to recreate Arizona Road Dust (ARD) synthetically by analyzing the chemical components of the natural dust and blending synthetic minerals together to match it. In the first study, experiments were performed on an effusion cooling test article with a coolant flow temperature of 894K and surface temperature of 1144K. Aerosolized dust with a 0-10 µm particle size distribution was delivered to the test article. The mineral recipe of AFRL was altered such that the presence of each of the five components ranged from 0% to 100%. For each of these AFRL recipe experiments several results were reported including capture efficiency, hole capture efficiency, mass flow reduction per gram, and normalized deposit height. Results are compared to a previous study of the inter-mineral synergies in an impingement cooling jet at the same temperature conditions. Despite differences in experimental facility flow geometry, overall agreement was found between the trends in deposition behavior of the dust blends. The strong deposition effects that were observed were shown to be related to adhesion forces of particles, mechanical properties, and chemical properties of the dust minerals. In the second study, X-Ray Diffraction (XRD) was performed on ARD to identify minerals present in a naturally sourced dust blend. Pure minerals were mixed in quantities that matched the XRD spectrum of ARD, and oxide content of this synthetic dust blend was shown to match the ISO standard (12103-1) to which ARD conforms. Particle size distribution was also matched to ARD (0-15 µm). Experiments were then conducted in four deposition facilities, one of which was representative of turbine hot section conditions (1500-1625K) and two were representative of internal coolant flow conditions (1144K). Impingement cooling deposition rates were comparable between the dusts. Normalized blockage rates of effusion cooling holes showed that OSU ARD (the dust blend created organically) blocked 37% less than PTI ARD (the dust blend purchased from an outside vendor, Powder Technologies Inc.). Static melting tests of OSU ARD at high temperature (1300-1500 K) showed a glass transition temperature approximately 50-60 K higher than PTI ARD. Results demonstrate the difficulty of precisely replicating naturally occurring mineral dust blends with regard to their deposition behavior in gas turbine engines. Sources of discrepancy among the dust blends and the importance of specifying mineral content for ubiquitous test dusts are discussed.
Datta Gaitonde (Committee Member)
Jeffrey Bons (Advisor)
124 p.
Aerospace Engineering
Dust Deposition, AFRL02, Arizona Road Dust, ARD, Turbine Engines, quartz, gypsum, albite, dolomite, halite, hematite, particles, volcanic ash, chemistry, high temperature, synergy.

Recommended Citations

Citations

  • Wendel, N. J. (2023). Exploration of the Role of Mineral Chemistry Toward Dust Deposition in Turbine Engines with Synthetic Mineral Dust Blends [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1681989012671083

    APA Style (7th edition)

  • Wendel, Nathanael. Exploration of the Role of Mineral Chemistry Toward Dust Deposition in Turbine Engines with Synthetic Mineral Dust Blends. 2023. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1681989012671083.

    MLA Style (8th edition)

  • Wendel, Nathanael. "Exploration of the Role of Mineral Chemistry Toward Dust Deposition in Turbine Engines with Synthetic Mineral Dust Blends." Master's thesis, Ohio State University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=osu1681989012671083

    Chicago Manual of Style (17th edition)

osu1681989012671083
71
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