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Nick_Plewacki_MSThesis_2020.pdf (1.31 MB)

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Modeling High Temperature Deposition in Gas Turbines

Plewacki, Nicholas
http://rave.ohiolink.edu/etdc/view?acc_num=osu1587714424017527

Abstract Details

2020, Master of Science, Ohio State University, Aero/Astro Engineering.
This thesis covers the intensive research effort to elucidate the role of elevated temperature in deposition. Several experimental campaigns were conducted in this pursuit. The testing explored high temperature deposition with 0-10 micron Arizona Road Dust (ARD) with the intent of creating a yield strength model that included temperature effects and could be incorporated into the existing OSU deposition model. Experimental work was first conducted in the impulse kiln facility where small amounts of the test dust were placed on ceramic targets and rapidly exposed to temperatures between 1200K and 1500K. Trends in the packing factor confirmed the existence of two threshold values (1350K and 1425K) that could be linked to strength characteristics of the dust when exposed to high temperatures. Using the information obtained from the kiln experiments, HTDF testing was conducted between 1325K and 1525K. Exit temperatures were set at 25K intervals in this region with a constant jet velocity of 150 m/s. The capture efficiency data showed this trend with temperature and indicated a softening temperature and melting temperature of 1362K and 1512K respectively. With these critical values in hand, the Ohio State University Molten Model was created to modify yield strength with particle velocity and temperature. The model was tested using CFD and showed a good capability for capturing particle temperature effects in deposition from an impinging particle-laden jet. A subsequent test campaign was conducted to explore the effect of varying surface temperature on deposition. Hastelloy coupons with Thermal Barrier Coatings (TBCs) were subjected to a constant jet at 1600K jet and 200 m/s while being cooled via a backside impingement jet. Surface temperatures between 1455K and 1125K were impacted with 0-10 micron ARD while an IR camera monitored the surface. Coupons with higher coolant flowrates (lower surface temperature) saw significantly lower deposition rates than the higher surface temperatures. CFD simulations using the newly vetted OSU Molten Model were not able to account for the strong decrease in deposition with boundary layer cooling. Therefore, it was posited that the model should eventually incorporate both particle and surface temperatures in its formulation.
Jeffrey Bons, Dr. (Advisor)
Randall Mathison, Dr. (Committee Member)
88 p.
Aerospace Engineering
depostion; gas turbine; gas turbine engine; turbomachinery; fouling; particle; particle impact; particle deposition; melting; experiment; combustion; multiphase flow; test dust; dust; gas turbine deposition; engine efficiency; propulsion; jet engine

Recommended Citations

Citations

  • Plewacki, N. (2020). Modeling High Temperature Deposition in Gas Turbines [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587714424017527

    APA Style (7th edition)

  • Plewacki, Nicholas. Modeling High Temperature Deposition in Gas Turbines. 2020. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1587714424017527.

    MLA Style (8th edition)

  • Plewacki, Nicholas. "Modeling High Temperature Deposition in Gas Turbines." Master's thesis, Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587714424017527

    Chicago Manual of Style (17th edition)

osu1587714424017527
207
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