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osu1338049511.pdf (20.18 MB)
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Parametric Study of the Effects of the Flapping Mode Excitation on the Near Field Structures of a Mach 1.3 Cold Jet
Author Info
Speth, Rachelle Lea
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=osu1338049511
Abstract Details
Year and Degree
2012, Master of Science, Ohio State University, Aero/Astro Engineering.
Abstract
This effort investigates numerical and physical parameters influencing an ideally-expanded Mach 1.3 jet excited by the m=+/-1 flapping mode. The excitation is imposed by eight Localized Arc Filament Plasma Actuators (LAFPA) placed around the periphery of the circular nozzle exit. The devices are modeled with a proven surface heating approach. The reference case considers the most amplified (jet column mode) frequency corresponding to a Strouhal number of 0.3, based on the diameter of the nozzle and the jet velocity, with an actuator-imposed temperature of 1500K and a duty cycle of 20%. Relative to this reference, the effects of changing frequency, duty cycle and actuator model temperature are explored. In some cases, e.g., actuator temperature, experimental data is not available, but for frequency, there is. The results are analyzed with several different quantitative and qualitative metrics, including time-averaged centerline decay and jet half width as well as phase-averaged coherent structures. Raising the frequency affects the dynamics in several ways. The number of vortical features observed in the phase-averaged data increases and the rate of decay of the centerline velocity is reduced. Furthermore, the alternating vortex ring interactions observed in the reference case are not distinct but are rather replaced by smaller structures, trends which are also observed in experiment. The flow mixes the fastest around the jet column mode (St~0.22). The higher duty cycles exhibits strengthened coherent structures and slightly higher jet growth along the flapping plane, but the overall dynamics remain the same. The response of the jet is relatively insensitive to actuator temperature model within reasonable limits. The latter two studies, with different duty cycles and actuator temperatures, are consistent with previous analyses demonstrating that instability manipulation, rather than heat deposition is the primary mechanism of control.
Committee
Datta Gaitonde, PhD (Advisor)
Mo Samimy, PhD (Committee Member)
Mei Zhuang, PhD (Committee Member)
Pages
73 p.
Subject Headings
Aerospace Engineering
;
Engineering
;
Mechanical Engineering
Keywords
supersonic jets
;
Large Eddy Simulation
;
plasma actuators
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Citations
Speth, R. L. (2012).
Parametric Study of the Effects of the Flapping Mode Excitation on the Near Field Structures of a Mach 1.3 Cold Jet
[Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338049511
APA Style (7th edition)
Speth, Rachelle.
Parametric Study of the Effects of the Flapping Mode Excitation on the Near Field Structures of a Mach 1.3 Cold Jet.
2012. Ohio State University, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=osu1338049511.
MLA Style (8th edition)
Speth, Rachelle. "Parametric Study of the Effects of the Flapping Mode Excitation on the Near Field Structures of a Mach 1.3 Cold Jet." Master's thesis, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338049511
Chicago Manual of Style (17th edition)
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Document number:
osu1338049511
Download Count:
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Copyright Info
© 2012, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.