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Shock Waves

, Volume 26, Issue 6, pp 825–833 | Cite as

A new sliding joint to accommodate recoil of a free-piston-driven expansion tube facility

  • D. E. GildfindEmail author
  • R. G. Morgan
Original Article

Abstract

This paper describes a new device to decouple free-piston driver recoil and its associated mechanical vibration from the acceleration tube and test section of The University of Queensland’s X3 expansion tube. A sliding joint is introduced to the acceleration tube which axially decouples the facility at this station. When the facility is fired, the upstream section of the facility, which includes the free-piston driver, can recoil upstream freely. The downstream acceleration tube remains stationary. This arrangement provides two important benefits. Firstly, it eliminates nozzle movement relative to the test section before and during the experiment. This has benefits in terms of experimental setup and alignment. Secondly, it prevents transmission of mechanical disturbances from the free-piston driver to the acceleration tube, thereby eliminating mechanically-induced transducer noise in the sensitive pressure transducers installed in this low-pressure tube. This paper details the new design, and presents experimental confirmation of its performance.

Keywords

Recoil Free-piston driver Impulse facility Expansion tube Mechanical vibration 

Notes

Acknowledgments

The authors wish to thank Mr. Frans De Beurs for technical support; HMG Hardchrome Pty Ltd for manufacturing support; the Australian Research Council for support and funding; and The Queensland Smart State Research Facilities Fund 2005 for support and funding.

Supplementary material

Supplementary material 1 (mp4 19999 KB)

Supplementary material 2 (mp4 34702 KB)

Supplementary material 3 (mp4 48949 KB)

Supplementary material 4 (mp4 48505 KB)

Supplementary material 5 (mp4 76545 KB)

Supplementary material 6 (mp4 16856 KB)

Supplementary material 7 (mp4 10405 KB)

References

  1. 1.
    Stalker, R.J.: Isentropic compression of shock tube driver gas. ARS J. 30, 564 (1960)Google Scholar
  2. 2.
    Gildfind, D.E., Jacobs, P.A., Morgan, R.G.: Vibration isolation in a free-piston driven expansion tube facility. Shock Waves 23(5), 431–438 (2013)CrossRefGoogle Scholar
  3. 3.
    Gildfind, D.E.: X3 recoil sliding joint drawing set (drawing number ‘x3-recoil-000-0’). Can be accessed at http://espace.library.uq.edu.au/view/UQ:370669 (2014)
  4. 4.
    Gildfind, D.E., Morgan, R.G., Sancho, J.: Design and commissioning of a new lightweight piston for the X3 expansion tube. In: The 29th International Symposium on Shock Waves, Madison, Wisconsin, USA, 14–19 July (2013)Google Scholar
  5. 5.
    Gildfind, D.E., Morgan, R.G., Sancho, J.: High Mach number scramjet test flows in the X3 expansion tube. In: The 29th International Symposium on Shock Waves, Madison, Wisconsin, USA, 14–19 July (2013)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.The University of QueenslandSt. LuciaAustralia

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