Design of Gages for Direct Skin Friction Measurements in Complex Turbulent Flows with Shock Impingement Compensation

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dc.contributor.authorRolling, August Jamesonen
dc.contributor.committeechairSchetz, Joseph A.en
dc.contributor.committeememberBoyer, Keith M.en
dc.contributor.committeememberHallauer, William L. Jr.en
dc.contributor.committeememberMacLean, Matthewen
dc.contributor.committeememberKapania, Rakesh K.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2014-03-14T20:13:25Zen
dc.date.adate2007-07-05en
dc.date.available2014-03-14T20:13:25Zen
dc.date.issued2007-06-07en
dc.date.rdate2007-07-05en
dc.date.sdate2007-06-21en
dc.description.abstractThis research produced a new class of skin friction gages that measures wall shear even in shock environments. One test specimen separately measured wall shear and variable-pressure induced moment. Through the investigation of available computational modeling methods, techniques for accurately predicting gage physical responses were developed. The culmination of these model combinations was a design optimization procedure. This procedure was applied to three disparate test conditions: 1) short-duration, high-enthalpy testing, 2) blow-down testing, and 3) flight testing. The resulting optimized gage designs were virtually tested against each set of nominal load conditions. The finalized designs each successfully met their respective test condition constraints while maximizing strain output due to wall shear. These gages limit sources of apparent strain: inertia, temperature gradient, and uniform pressure. A unique use of bellows provided a protective shroud for surface strain gages. Oil fill provided thermal and dynamic damping while eliminating uniform pressure as a source of output voltage. Two Wheatstone bridge configurations were developed to minimize temperature effects first from temperature gradient and then from spatially varying heat flux induced gradient. An inertia limiting technique was developed that parametrically investigated mass and center of gravity impact on strain output. Multiple disciplinary computational simulations of thermal, dynamic, shear, moment, inertia, and instrumentation interaction were developed. Examinations of instrumentation error, settling time, filtering, multiple input dynamic response, and strain gage placement to avoid thermal gradient were conducted. Detailed mechanical drawings for several gages were produced for fabrication and future testing.en
dc.description.degreePh. D.en
dc.identifier.otheretd-06212007-161239en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06212007-161239/en
dc.identifier.urihttp://hdl.handle.net/10919/28093en
dc.publisherVirginia Techen
dc.relation.haspartRollingVT2007July3.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectwall shearen
dc.subjectshock impingementen
dc.subjectcomplex turbulent flowen
dc.subjectskin frictionen
dc.titleDesign of Gages for Direct Skin Friction Measurements in Complex Turbulent Flows with Shock Impingement Compensationen
dc.typeDissertationen
thesis.degree.disciplineAerospace and Ocean Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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