Image Analysis of Acoustically Excited Bluff Body Flames

dc.contributor.author Plaks, Dmitriy Vital en_US
dc.contributor.department Aerospace Engineering en_US
dc.date.accessioned 2008-02-19T20:55:14Z
dc.date.available 2008-02-19T20:55:14Z
dc.date.issued 2007-12-17 en_US
dc.description.abstract This thesis analyzes the effects of various bluff bodies on the downstream flow field. Bluff bodies, for example, those typically found in jet engine augmentors, are objects designed to impede the flow in order to stabilize a flame. The effects of different bluff body shapes (cylindrical and triangular), size (6.35 mm, 9.53 mm, 12.7 mm, and 19.1 mm) and heat release are examined with respect to their influence on downstream vorticity strength, vortex separation distance, and vorticity divergence angle. Particle Image Velocimetry (PIV) is used to obtain the velocity field data from which the vorticity field is calculated. The mean flow velocity, U∞ is 2.7 m/s, and the flow is acoustically excited at 300 Hz with a normalized acoustic velocity of u'/U∞ = 0.8. The vorticity divergence angle increases with increasing bluff body size, is not affected by bluff body shape, and has a non-linear correlation with heat release. Downstream vorticity strength is affected by all three parameters (bluff body shape, size and heat release) in a non-linear manner. Vortex separation distance is a function primarily of bluff body size, increasing for larger bodies; however, the separation distance decreases with increasing heat release. Bluff body shape also has an effect on vortex separation distance as the cylindrical bluff body creates a larger separation distance between vortices. en_US
dc.description.advisor Committee Member/Second Reader: Seitzman, Jerry; Faculty Mentor: Lieuwen, Tim en_US
dc.identifier.uri http://hdl.handle.net/1853/19948
dc.publisher Georgia Institute of Technology en_US
dc.subject Bluff body en_US
dc.subject Acoustic forcing en_US
dc.subject Particle image velocimetry en_US
dc.subject Vorticity en_US
dc.subject Flame response en_US
dc.title Image Analysis of Acoustically Excited Bluff Body Flames en_US
dc.type Text
dc.type.genre Undergraduate Thesis
dspace.entity.type Publication
local.contributor.corporatename Daniel Guggenheim School of Aerospace Engineering
local.contributor.corporatename College of Engineering
local.contributor.corporatename Undergraduate Research Opportunities Program
local.relation.ispartofseries Undergraduate Research Option Theses
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