Hypersonic Application of Focused Schlieren and Deflectometry
dc.contributor.advisor | Yu, Kenneth H | en_US |
dc.contributor.author | VanDercreek, Colin Paul | en_US |
dc.contributor.department | Aerospace Engineering | en_US |
dc.contributor.publisher | Digital Repository at the University of Maryland | en_US |
dc.contributor.publisher | University of Maryland (College Park, Md.) | en_US |
dc.date.accessioned | 2010-10-07T06:11:40Z | |
dc.date.available | 2010-10-07T06:11:40Z | |
dc.date.issued | 2010 | en_US |
dc.description.abstract | A non-intrusive diagnostic capability for determining the hypersonic shock and boundary layer structure was developed, installed, and successfully tested at the AEDC Hypervelocity Tunnel 9. This customized diagnostic involves a combination of a focused schlieren system, which relies on creating multiple virtual light sources using a Fresnel lens and a source grid, and a deflectometry system, which uses the focused schlieren and a photomultiplier tube. It was used for obtaining spatially resolved images of density gradients with a depth of focus less than one centimeter, while allowing high frequency measurements of density fluctuations. The diagnostic was applied in investigating the second-mode instability waves present in the boundary layer of a sharp-nosed cone submerged in a Mach 10 flow. The waves were successfully imaged and their frequencies were measured even though the flow density was below 0.01 kg/m^3 and the frequencies over 200 kHz. This adds a new capability to hypersonic testing. | en_US |
dc.identifier.uri | http://hdl.handle.net/1903/10949 | |
dc.subject.pqcontrolled | Engineering, Aerospace | en_US |
dc.subject.pqcontrolled | Physics, Optics | en_US |
dc.subject.pquncontrolled | Boundary Layer | en_US |
dc.subject.pquncontrolled | Deflectometry | en_US |
dc.subject.pquncontrolled | Focused Schlieren | en_US |
dc.subject.pquncontrolled | Hypersonic | en_US |
dc.subject.pquncontrolled | Second-mode waves | en_US |
dc.title | Hypersonic Application of Focused Schlieren and Deflectometry | en_US |
dc.type | Thesis | en_US |
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