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The Results of Chemical Composition on High Temperature Dust Deposition

Mizer, Andrew Emerson
http://rave.ohiolink.edu/etdc/view?acc_num=osu1683548528384448

Abstract Details

2023, Master of Science, Ohio State University, Mechanical Engineering.
Airborne particulate ingestion into modern, high temperature aeronautical turbine engines can cause damage to internal components, including total engine failure. Volcanic ash interactions with turbine engines has been well studied, and current research in the field focuses on other mineral based test dusts that more closely emulate desert sand and other natural materials. This work focuses on AFRL test dust, the product of an Air Force program to formulate a dust that will create engine deposits that are similar in chemical composition to those deposits found in engines post service. This test dust contains quartz, gypsum, dolomite, aplite and salt, common minerals found in Earth’s crust. Utilizing high temperature facilities at The Ohio State University, a testing campaign was developed to seek further understanding of any chemical synergies between these five minerals in an impinging jet configuration. The base AFRL recipe was altered in order to remove individual minerals or increase the quantity of given mineral in proportion to the others in order to compare deposition characteristics in the context of chemical composition when compared to the base mixture. Removing any single mineral does not noticeably change capture efficiencies of AFRL when compared to the control mixture. Capture efficiencies were driven by temperature much more than any given chemical manipulations as it was found that increasing temperature will increase the capture efficiency. At a certain point, deposits cool to a shiny, glassy finish and are incredibly hard. At these temperatures, chemical synergies are better interpreted through the lens of amorphous silica glass networks and alkali network modifiers than the previously proposed ratio of calcium to silicon, although these concepts are related as a silica glass network is heavily modified by the presence of calcium. These alkali network modifiers will decrease the viscosity of a partially or fully molten deposit, and lower viscosities of molten material have been shown to benefit deposition rates. Additionally, most of the pure mineral components of AFRL do not deposit in mass quantities anywhere near a mixed blend, with the notable exception of gypsum at high temperatures.
Lian Duan (Committee Member)
Jeffrey Bons (Advisor)
83 p.
Aerospace Engineering; Mechanical Engineering
dust deposition, gas turbine engines, CMAS, glassificiation

Recommended Citations

Citations

  • Mizer, A. E. (2023). The Results of Chemical Composition on High Temperature Dust Deposition [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1683548528384448

    APA Style (7th edition)

  • Mizer, Andrew. The Results of Chemical Composition on High Temperature Dust Deposition. 2023. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1683548528384448.

    MLA Style (8th edition)

  • Mizer, Andrew. "The Results of Chemical Composition on High Temperature Dust Deposition." Master's thesis, Ohio State University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=osu1683548528384448

    Chicago Manual of Style (17th edition)

osu1683548528384448
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© 2023, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.