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dc.contributor.authorEcker, Tobiasen_US
dc.date.accessioned2014-03-14T20:44:04Z
dc.date.available2014-03-14T20:44:04Z
dc.date.issued2011-08-03en_US
dc.identifier.otheretd-08232011-110638en_US
dc.identifier.urihttp://hdl.handle.net/10919/34720
dc.description.abstractDetermination of particle slip is a major concern for particle based measurements in un- heated supersonic facilities, as it is a limiting factor for the instrumentsâ frequency response. For the purpose of determining the particle deceleration through a stationary shock wave in a super sonic windtunnel, a novel 1-D Laser Doppler probe with an unique spatial range (~1.5 mm) is presented. The study first gives a short review of the physics of particle motion with respect to different drag models and flow regime encountered in super sonic flows. In the second part, the focus lies on the development of a new Laser Doppler probe using non Gaussian beams to obtain a prolonged measurement volume. This volume covers a major part of the particle lag after a shock wave. An experimental investigation on particle accel- eration and drag, using different types and sizes of seeding material, including standardized microspheres is carried out in the Mâ = 2.0 super sonic facility. Three different types of particles with four different sizes are experimentally investigated. The experimental data provides mean velocity as a function of distance from the shock and reveals significant ag- glomeration and evaporation problems with Titanium Oxide and Polystyrene Latex spheres. Particle acceleration measurements are presented, proving the unique concept of the new Laser Doppler probe. Mean and instantaneous acceleration data is extracted from high SNR signals. The acceleration data obtained is consistent in magnitude and trend with the physical phenomena expected and shows the feasibility of the new instrument.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartECKER_T_T_2011.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectAccelerationen_US
dc.subjectParticle Dragen_US
dc.subjectMultiphase Flowen_US
dc.subjectLaser Doppleren_US
dc.subjectSupersonicen_US
dc.subjectSlip Flowen_US
dc.subjectNon-Continuum Flowen_US
dc.titleExperimental Investigation of Particle Lag behind a Shock Wave using a Novel Laser Doppler Accelerometeren_US
dc.typeThesisen_US
dc.contributor.departmentAerospace and Ocean Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineAerospace and Ocean Engineeringen_US
dc.contributor.committeechairSimpson, Roger L.en_US
dc.contributor.committeememberVlachos, Pavlos P.en_US
dc.contributor.committeememberSchetz, Joseph A.en_US
dc.contributor.committeememberLowe, Kevin Todden_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08232011-110638/en_US
dc.date.sdate2011-08-23en_US
dc.date.rdate2011-09-06
dc.date.adate2011-09-06en_US


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