Flow Control Over a Circular Arc Airfoil by Periodic Blowing

dc.contributor.authorRullan, Jose M.en
dc.contributor.committeechairTelionis, Demetri P.en
dc.contributor.committeememberRagab, Saad A.en
dc.contributor.committeememberVlachos, Pavlos P.en
dc.contributor.departmentEngineering Science and Mechanicsen
dc.date.accessioned2011-08-06T16:08:08Zen
dc.date.adate2004-11-04en
dc.date.available2011-08-06T16:08:08Zen
dc.date.issued2004-08-20en
dc.date.rdate2004-11-04en
dc.date.sdate2004-10-22en
dc.description.abstractThe flow over sharp-edged wings is almost always separated. The control of separated flows is possible and benefits can be achieved but only in a time average sense. A new design of an actuator was designed and tested which can achieve a wide range velocity of without frequency dependence, is free of oscillating components as well as free of secondary frequencies and therefore can be scaled up easily, unlike a traditional synthetic jet. The actuator can achieve a considerable amount of jet vectoring, thus aligning the disturbance with the leading edge shear layer. Results indicate that unsteady mini-jet actuation is an effective actuation device capable of increasing the lift in the stall region of the airfoil. Moreover, pressure measurements showed that two parameters could be altered to maximize the lift. The momentum coefficient needed a minimum value to exert influence and the actuating frequency need not be at exact the natural shedding frequency to improve the lift and can be operated at harmonics of the natural shedding frequency and obtain improvements.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.otheretd-10222004-132351en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10222004-132351en
dc.identifier.urihttp://hdl.handle.net/10919/10178en
dc.publisherVirginia Techen
dc.relation.haspartthesis_Jose_Rullan.pdfen
dc.relation.haspart2500s25z.avien
dc.relation.haspart2511s25z.avien
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectvortex formationen
dc.subjectjet pulsationen
dc.subjectseparated flowen
dc.subjectflow controlen
dc.subjectSharp edge airfoilen
dc.titleFlow Control Over a Circular Arc Airfoil by Periodic Blowingen
dc.typeThesisen
thesis.degree.disciplineEngineering Science and Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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