An Experimental Investigation Into the Effect of Plasma on the Flow Features of an Axisymmetric Jet
Huffman, Richard E.
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https://hdl.handle.net/2142/85105
Description
Title
An Experimental Investigation Into the Effect of Plasma on the Flow Features of an Axisymmetric Jet
Author(s)
Huffman, Richard E.
Issue Date
2007
Doctoral Committee Chair(s)
Gregory Elliott
Department of Study
Aerospace Engineering
Discipline
Aerospace Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Fluid and Plasma
Language
eng
Abstract
The plasma did influence the mean and turbulent velocity profiles of the jets tested - allowing the jet core to penetrate further downstream. Large scale structure tracking indicated an increase in convective velocity of up to 5%. Heating of the shear layer by the plasma field was believed to bias the convective velocity towards the jet core by increasing the speed of sound in the shear layer. Rotational temperatures taken by model matching of spectroscopy data indicated shear layer heating which supports an equivalent increase in convective velocity as was measured in large scale structure tracking. In perfectly expanded jets, turbulent kinetic energy decreased along the jet centerline by 7% to 14% and were not influenced by compressibility which is consistent with increased jet penetration. However, in pipe-flow jets the centerline turbulent kinetic energy decreased at low equivalent Mach numbers, reversing to slight increases for equivalent Mach numbers over 1.4.
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