Turbulence measurements and noise generation in a transonic cryogenic wind tunnel

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dc.contributor.authorGriffith, Dwaine O.en
dc.contributor.committeechairNg, Wing Faien
dc.contributor.committeememberMoore, Johnen
dc.contributor.committeememberDancey, Clinton L.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:50:30Zen
dc.date.adate2012-11-21en
dc.date.available2014-03-14T21:50:30Zen
dc.date.issued1989-04-15en
dc.date.rdate2012-11-21en
dc.date.sdate2012-11-21en
dc.description.abstractA high-frequency combination probe was used to measure dynamic flow quality in the test section of the NASA Langley 0.3-m Transonic Cryogenic Tunnel. The probe measures fluctuating stagnation (total) temperature and pressure, static pressure, and flow angles in two orthogonal planes. Simultaneous unsteady temperature and pressure measurements were also made in the settling chamber of the tunnel. The data show that the stagnation temperature fluctuations remain constant, and the stagnation pressure fluctuations increase by a factor of two, as the flow accelerates from the settling chamber to the test section. In the test section, the maximum rms value of the normalized fluctuating velocity is 0.7 percent. Correlation coefficients l failed to show vortlcity, entropy, or sound as the dominant mode of turbulence in the tunnel. At certain tunnel operating conditions, periodic disturbances are seen in the data taken in the test section. A possible cause for the disturbances is found to be acoustic coupling of the test section and plenum chamber via the perforated side walls in the tunnel. The experimental data agree well with the acoustic coupling theory.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 66 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11212012-040333en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11212012-040333/en
dc.identifier.urihttp://hdl.handle.net/10919/45979en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1989.G733.pdfen
dc.relation.isformatofOCLC# 19979739en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1989.G733en
dc.subject.lcshTransonic wind tunnelsen
dc.subject.lcshWind tunnelsen
dc.titleTurbulence measurements and noise generation in a transonic cryogenic wind tunnelen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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