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dc.contributor.advisorLigrani, Phillip M.
dc.contributor.advisorSubramanian, Chelakara S.
dc.contributor.authorCoumes, Thomas M.
dc.dateDecember 1989
dc.date.accessioned2013-01-23T22:08:43Z
dc.date.available2013-01-23T22:08:43Z
dc.date.issued1989-12
dc.identifier.urihttp://hdl.handle.net/10945/27012
dc.description.abstractLaminar/turbulent transition is studied in a straight channel with 1 Hz imposed bulk flow unsteadiness for Reynolds numbers of 1103 to 2715 and Strouhal numbers of 0.06045 to 0.02455. Channel aspect ratio is 40 to 1 with 12.7 cm height, 50.8 cm width and 4.27 cm in length. Observations, videos and photographs of smoke patterns show different subcritical transition events including Tollmien-Schlicting waves, vortex-array type motion evidenced by smoke swirls and ribbon like patterns, turbulent spots and fully turbulent flow. Fluctuating intensity magnitudes relative to velocities from imposed unsteadiness are determined form phase-averaged velocity traces. Of particular interest, is whether the imposed unsteadiness advances or delays transition events. With the conditions that were investigated, transition events begin to occur at lower Reynolds numbers and extend over a wider range of Reynolds numbers compared to flows with no imposed unsteadiness.en_US
dc.description.urihttp://archive.org/details/effectsofhzimpos1094527012
dc.format.extent194 p.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleEffects of 1 Hz imposed bulk flow unsteadiness on laminar/turbulent transition in a straight channelen_US
dc.typeThesisen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)
dc.contributor.departmentMechanical Engineering
dc.subject.authorImposed bulk flow unsteadinessen_US
dc.subject.authorLaminar/turbulent transitionen_US
dc.subject.authorTollmien-Schlichting wavesen_US
dc.subject.authorVortex and turbulent spotsen_US
dc.description.serviceLieutenant Commander, United States Navyen_US
etd.thesisdegree.nameM.S. in Mechanical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineMechanical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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