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Measurement of Unsteady Characteristics of Endwall Vortices Using Surface-Mounted Hot-Film Sensors

Veley, Emma Michelle
http://rave.ohiolink.edu/etdc/view?acc_num=wright1534450563500249

Abstract Details

2018, Master of Science in Mechanical Engineering (MSME), Wright State University, Mechanical Engineering.
High-lift low-pressure turbine blades produce significant losses at the junction with the endwall. The losses are caused by several complex three-dimensional vortical flow structures, which interact with the blade suction surface boundary layer. This study investigates the unsteady characteristics of these endwall flow structures on a highly loaded research profile and the adjacent endwall using surface-mounted hot-film sensors. Experiments were conducted in a low-speed linear cascade wind tunnel. The front-loaded blade profile was subjected to three different inlet conditions, consisting of two turbulence levels, and three incoming boundary layer thicknesses. Multiple surface-mounted hot-film sensors were installed throughout the passage. This thesis progressed in three stages of research. The first verified that the hot-film sensors could be used to detect flow structures in the cascade. The second used the results from installed hot-films to examine the unsteady characteristics of vortices formed near the leading edge and the propagation of the passage vortex across the passage where it interacts with a corner separation along the suction surface. Simultaneous measurements from the hot-film sensors were analyzed for frequency spectra and time lag in order to provide new insight into the endwall flow dynamics. Finally, signatures from the hot-films were linked to specific flow phenomena through concurrent flow visualization. At each stage of the investigation, results were compared to the results of a numerical simulation.
Mitch Wolff, Ph.D. (Advisor)
Rolf Sondergaard, Ph.D., P.E. (Committee Member)
Christopher Marks, Ph.D. (Committee Member)
95 p.
Aerospace Engineering; Engineering; Mechanical Engineering
turbines; PIV; SPIV; particle image velocimetry; low pressure turbines; high lift turbines; experimental measurements; aerodynamics; turbulent flow; hot film; flow visualization; unsteady; passage vortex; vortex dynamics

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Citations

  • Veley, E. M. (2018). Measurement of Unsteady Characteristics of Endwall Vortices Using Surface-Mounted Hot-Film Sensors [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1534450563500249

    APA Style (7th edition)

  • Veley, Emma. Measurement of Unsteady Characteristics of Endwall Vortices Using Surface-Mounted Hot-Film Sensors. 2018. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1534450563500249.

    MLA Style (8th edition)

  • Veley, Emma. "Measurement of Unsteady Characteristics of Endwall Vortices Using Surface-Mounted Hot-Film Sensors." Master's thesis, Wright State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1534450563500249

    Chicago Manual of Style (17th edition)

wright1534450563500249
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© 2018, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.