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Hypersonic Application of Focused Schlieren and Deflectometry

dc.contributor.advisorYu, Kenneth Hen_US
dc.contributor.authorVanDercreek, Colin Paulen_US
dc.description.abstractA 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.titleHypersonic Application of Focused Schlieren and Deflectometryen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentAerospace Engineeringen_US
dc.subject.pqcontrolledEngineering, Aerospaceen_US
dc.subject.pqcontrolledPhysics, Opticsen_US
dc.subject.pquncontrolledBoundary Layeren_US
dc.subject.pquncontrolledFocused Schlierenen_US
dc.subject.pquncontrolledSecond-mode wavesen_US

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