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Slender-Body Hypervelocity Boundary-Layer Instability

Posted on:2014-04-03Degree:Ph.DType:Dissertation
University:California Institute of TechnologyCandidate:Parziale, NickFull Text:PDF
GTID:1452390005996141Subject:Engineering
Abstract/Summary:
With novel application of optical techniques, the slender-body hypervelocity boundary-layer instability is characterized in the previously unexplored regime where thermo-chemical effects are important. Narrowband disturbances (500-3000 kHz) are measured in boundary layers with edge velocities of up to 5~km/s at two points along the generator of a 5 degree half angle cone. Experimental amplification factor spectra are presented. Linear stability and PSE analysis is performed, with fair prediction of the frequency content of the disturbances; however, the analysis over-predicts the amplification of disturbances. The results of this work have two key implications: 1) the acoustic instability is present and may be studied in a large-scale hypervelocity reflected-shock tunnel, and 2) the new data set provides a new basis on which the instability can be studied.
Keywords/Search Tags:Hypervelocity, Instability
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