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The Effect of Film Cooling on Nozzle Guide Vane Ash Deposition

Bonilla, Carlos Humberto
http://rave.ohiolink.edu/etdc/view?acc_num=osu1353961326

Abstract Details

2012, Master of Science, Ohio State University, Aero/Astro Engineering.
An accelerated deposition test facility was used to study the relationship between film cooling, surface temperature, and particle temperature at impact on deposit formation. Tests were run at gas turbine representative inlet Mach numbers (0.1) and temperatures (1090°C). Deposits were created from lignite coal fly ash with median diameters of 1.3 and 8.8µm. Two CFM56-5B nozzle guide vane doublets, comprising three full passages and two half passages of flow, were utilized as the test articles. Tests were run with different levels of film cooling back flow margin and coolant temperature. Particle temperature upon impact with the vane surface was shown to be the leading factor in deposition. Since the particle must traverse the boundary layer of the cooled vane before impact, deposition is directly affected by the film and metal surface temperature as well. Film coolant jet strength showed only minor effect on deposit patterns on the leading edge. However, larger Stokes number (resulting in higher particle impact temperature) corresponded with increased deposit coverage area on the shower head region. Additionally, infrared measurements showed a strong correlation between regions of greater deposits and elevated surface temperature on the pressure surface. Thickness distribution measurements also highlighted the effect of film cooling by showing reduced deposition immediately downstream of cooling holes. A set of secondary tests were also conducted to briefly study the effect of Stokes number on leading edge deposition with no cooling, in order to support conclusions from the primary tests. It was found that larger Stokes number led to an increase in rate of deposition due to a greater number of particles being able to follow their inertial trajectories and impact the vane. Implications for engine operation in particulate-laden environments are discussed.
Jeffrey Bons, PhD (Advisor)
Micheal Dunn, PhD (Committee Member)
Aerospace Engineering; Aerospace Materials; Engineering
Deposition; film cooling; ash deposition; nozzle guide vane; deposit; heat transfer; turbine deposition; engine deposition

Recommended Citations

Citations

  • Bonilla, C. H. (2012). The Effect of Film Cooling on Nozzle Guide Vane Ash Deposition [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1353961326

    APA Style (7th edition)

  • Bonilla, Carlos. The Effect of Film Cooling on Nozzle Guide Vane Ash Deposition. 2012. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1353961326.

    MLA Style (8th edition)

  • Bonilla, Carlos. "The Effect of Film Cooling on Nozzle Guide Vane Ash Deposition." Master's thesis, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1353961326

    Chicago Manual of Style (17th edition)

osu1353961326
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© 2012, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.