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Shock accelerated cylindrical gas inhomogeneities. Part 2 - A heavy gas cylinder

Jacobs, J. W. (1993) Shock accelerated cylindrical gas inhomogeneities. Part 2 - A heavy gas cylinder. .

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Experiments have been carried out in which a cylindrical volume of a heavy gas is impulsively accelerated by a weak shock wave. A laminar jet of sulphur hexafluoride (SF_6) is used to produce the heavy gas cylinder. Planar laser induced fluorescence (PLIF) is used to visualize the flow. In viewing the PLIF images it is discovered that the vorticity that early on resides on the boundary between the two gasses, separates from the cylinder to form a pair of vortices. Subsequently these vortices wrap the heavy gas around them. This process is quite different from what is observed when the cylinder is lighter than its surroundings. Similar experiments with helium (part 1 of this series) showed that a small amount light gas stays with the vorticity, eventually becoming part of the vortex cores. A simple model capable of explaining these differences is presented. In addition, the displacement of the jet cross section is measured and agrees reasonably well with previous experimental and computational results.

Item Type:Report or Paper (Working Paper)
Additional Information:© 1993. The author wishes to thank Professors EE. Marble, E.E. Zukoski and B. Sturtevant for their help and support with this research. Credit is due to Dr. R. Miake-Lye for his help with laser induced fluorescence system. Professor C.H.K. Williamson also deserves credit for his helpful comments and suggestions during the preparation of this paper. This work was supported by the Air Force Office of Scientific Research contract F49620-C-0113.
Group:Guggenheim Jet Propulsion Center
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)F49620-C-0113
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Other Numbering System NameOther Numbering System ID
Guggenheim Jet Propulsion Center UNSPECIFIED
Record Number:CaltechAUTHORS:20101129-083502142
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Official Citation:Jacobs, J. W. (1991), "Shock Accelerated Cylindrical Gas Inhomogeneities, Part 2, A Heavy Gas Cylinder," submitted to JFM.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21030
Deposited By: Ruth Sustaita
Deposited On:09 Feb 2011 18:51
Last Modified:03 Oct 2019 02:18

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