Improvement In Acoustic Liner Attenuation In Turbofan Engines By Means Of Plasma Synthetic Jet Actuator

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dc.contributor.authorBarnobi, Christopher Louisen
dc.contributor.committeechairFuller, Christopher R.en
dc.contributor.committeememberWicks, Alfred L.en
dc.contributor.committeememberPapenfuss, Cory M.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:41:31Zen
dc.date.adate2010-07-29en
dc.date.available2014-03-14T20:41:31Zen
dc.date.issued2010-07-02en
dc.date.rdate2010-07-29en
dc.date.sdate2010-07-15en
dc.description.abstractDespite many advances in aviation noise control over the past 50 years, the industry is continually striving to reduce noise emissions. Turbofan engine acoustic liners are efficient attenuators of engine noise. Plasma actuators have been used as flow control devices in other settings and will now be studied as an enhancement for acoustic liners. A plasma actuator can excite oscillatory flow or a single direction (bias flow). Both flow types are studied as possible means to excite turbofan liners in order to improve the acoustic performance. Experiments revealed the oscillatory flow as the dominant factor in controlling resonator performance. The phase control of the actuator signal is an important parameter when dealing with the oscillatory flow. The actuator is first applied to a single resonator and then a set of six resonators. The experiments show that with the correct phase, the actuators improved the performance of a single resonator by 3 dB to 5 dB. The results for the array of actuators/resonators mirror the results of a single device. Beyond the improvements in performance, a number of other factors affect the usefulness of the plasma actuator technology in a turbofan environment. The ability of the actuator to produce plasma is susceptible to small imperfections in the device, and this property will likely be amplified in a perforated sheet with embedded actuators. Additional weight and energy consumed by the actuators is another factor to consider. Finally, plasma actuator operation produces ozone, so environmental effects deserve consideration as well.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-07152010-120817en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07152010-120817/en
dc.identifier.urihttp://hdl.handle.net/10919/34022en
dc.publisherVirginia Techen
dc.relation.haspartBarnobi_CB_T_2010.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectnoise controlen
dc.subjectacoustic lineren
dc.subjectturbofanen
dc.subjectplasma synthetic jet actuatoren
dc.titleImprovement In Acoustic Liner Attenuation In Turbofan Engines By Means Of Plasma Synthetic Jet Actuatoren
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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