A Sampling Probe for Fluctuating Concentration Measurements in Supersonic Flow

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dc.contributor.authorXillo, Olivier IIIen
dc.contributor.committeechairSchetz, Joseph A.en
dc.contributor.committeememberNg, Faien
dc.contributor.committeememberSimpson, Roger L.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2014-03-14T20:51:26Zen
dc.date.adate1998-05-13en
dc.date.available2014-03-14T20:51:26Zen
dc.date.issued1998-04-24en
dc.date.rdate1999-05-13en
dc.date.sdate1998-04-24en
dc.description.abstractThe study of mixing processes in supersonic flow has a great interest for a number of applications including scramjet developments. However, the usual tools employed are very limited. Sampling probes generally have a poor frequency response, and that makes measurements of fluctuating concentration problematic. The goal of this study is to design, build and test a probe capable of measuring concentration fluctuations of at least 1 kHz. This study shows the design of such a probe and how a high frequency response was achieved. A prototype was built and tested. The tests consist of a calibration phase and experiments inside a hypersonic wind tunnel. These last tests served two purposes. The first one was to verify that the measurements made with the probe gave the correct value of the concentration. The second purpose was to assess the frequency response of the probe by putting it through a concentration step change. Tests were conducted with various known mixtures of Helium and air from 0% to 100% flowing at Mach 2.0 with T<sub>t</sub>=300 °K and P<sub>t</sub>=4.4 atm. The probe proved capable of measuring concentration fluctuations up to approximately 2.5 kHz while also giving the adequate accuracy for values of mean concentration.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-41298-124436en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-41298-124436/en
dc.identifier.urihttp://hdl.handle.net/10919/36670en
dc.publisherVirginia Techen
dc.relation.haspartthesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectFluctuatingen
dc.subjectSupersonicen
dc.subjectConcentrationen
dc.subjectMeasurementsen
dc.titleA Sampling Probe for Fluctuating Concentration Measurements in Supersonic Flowen
dc.typeThesisen
thesis.degree.disciplineAerospace and Ocean Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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