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A direct numerical simulation of dielectric barrier discharge (DBD) plasma actuators for turbulent skin-friction control
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Elam, Dana (2012) A direct numerical simulation of dielectric barrier discharge (DBD) plasma actuators for turbulent skin-friction control. PhD thesis, University of Warwick.
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WRAP_THESIS_Elam_2012.pdf - Submitted Version - Requires a PDF viewer. Download (22Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b2582582~S1
Abstract
Turbulent skin-friction control is the subject of much research and the use of transverse (spanwise) oscillating motions offers the means of obtaining a significant reduction in skin-friction. Dielectric barrier discharge (DBD) actuators can be used to generate spanwise oscillating waves but the difficulty in placing a sensor in the area of plasma gives rise to problems in recording near-wall velocities. A modified version of the Shyy et al. (2002) DBD model was integrated into a direct numerical simulation (DNS). This numerical model was used in a series of two-dimensional simulations, in initially quiescent flow, and the results were compared to results reported from experimental investigations. A close affinity was found confirming that the DBD model is satisfactory.
Both a temporal and a spatial, spanwise oscillating flow were investigated. Only one plasma profile was investigated. Three actuator spacings were investigated. Only the largest actuator spacing resulted in a gap between each plasma profile that was larger than the plasma profile width itself. A spatially uniform plasma configuration produced larger DR% than spanwise wall oscillation for both spatial and temporal waves, maximum DR = 51% compared to a DR = 47% for a spanwise wall oscillation. Increased skin-friction reductions originated from the displacement of the Stokes layer.
The spatial wave produced lower skin-friction values than temporal waves for all the configurations. For both spatial and temporal waves the performance of the discrete configurations in producing an overall skin-friction reduction decreased with increasing actuator spacing. Using both temporal and spatial waves, the configuration with the largest spacing, which is relatively small, did not produce a drag reduction for any case that was tested.
Item Type: | Thesis (PhD) | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||
Library of Congress Subject Headings (LCSH): | Frictional resistance (Hydrodynamics), Actuators, Turbulence | ||||
Official Date: | June 2012 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | School of Engineering | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Chung, Yongmann M. | ||||
Extent: | xix, 190 leaves : ill., charts | ||||
Language: | eng |
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