conDIVnozzleANALYSIS

conDIVnozzleANALYSIS - ABSTRACT Title of Thesis:...

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ABSTRACT Title of Thesis: CHARACTERIZATION OF TRANSIENT PRESSURE LOADS IN THE RESERVOIR OF A HYPERSONIC BLOWDOWN TUNNEL Kerrie Anne Smith, M.S., 2005 Thesis Directed By: Professor Mark J. Lewis, Department of Aerospace Engineering When flow through a hypersonic blowdown tunnel is initiated by the bursting of a diaphragm, expansion of the process gas into the downstream vacuum of the facility creates a strong rarefaction wave. This rarefaction propagates upstream, generating significant pressure drops in upstream components, such as a heater. These pressure drops can be attenuated with the use of a metering orifice, which requires an accurate prediction of the pressure drop for proper sizing. So as to be generally applicable and to provide physical insight, a closed-form or simple numerical solution for determining this pressure drop is preferred over computational fluid dynamics. Three methods are investigated: acoustic reflection, flow pattern assumption, and the Method of Characteristics. By examining the three methods in conjunction, tradeoffs between complexity and physical accuracy can be analyzed. Ultimately, this study shall lead to the design of an experiment to verify the accuracy of the three methods.
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CHARACTERIZATION OF TRANSIENT PRESSURE LOADS IN THE RESERVOIR OF A HYPERSONIC BLOWDOWN TUNNEL By Kerrie Anne Smith Thesis submitted to the Faculty of the Graduate School of the University of Maryland, College Park, in partial fulfillment of the requirements for the degree of Master of Science 2005 Advisory Committee: Professor Mark J. Lewis, Chair Associate Professor Kenneth Yu Visiting Professor Robert Korkegi
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© Copyright by Kerrie Anne Smith 2005
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ACKNOWLEDGEMENTS I would like to thank my advisor, Dr. Mark Lewis, for his guidance and advice on this project, as well as throughout my graduate school experience. I would also like to extend thanks to Dr. Kenneth Yu and Dr. Robert Korkegi for serving on my committee. Portions of this work have been supported by Arnold Engineering Development Center, with John Lafferty as technical monitor and by the Space Vehicle Technology Institute under grant NCC3-989 jointly funded by NASA and DOD within the NASA Constellation University Institutes Project, with Claudia Meyer as the project manager. The staff of AEDC Hypervelocity Tunnel 9 have been invaluable. In addition to inspiring this research, they have been incredibly supportive and helpful in both my theoretical studies and the development of a validation experiment. In particular, I would like to thank Joe Coblish, as well as John Lafferty, Dan Marren and Joe Norris. I would like to thank all the members of my research group for advice, opinions, and mutual sympathy. Finally, I would like to thank my family and friends for all the love, support and enthusiasm they have given me during the last two years.
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conDIVnozzleANALYSIS - ABSTRACT Title of Thesis:...

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