Noise Reduction in Argon Driven Expansion Tubes

  • A. Paull


Analytical results are used to show that the presence of noise in the test flow of an expansion tube is dependent on the sound speed of the driver gas. If the flow enthalpy is fixed it is shown that lowering the sound speed of the driver makes the test flow quieter. It is also shown that it is more difficult to obtain quiet test flows at lower enthalpies. The analysis also predicts that a decrease in the driver gas sound speed may be required if the reduction in noise in large diameter expansion tubes is to be the same as that in small tubes.

Key words

Expansion tube Noise reduction 


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  1. Jacobs PA (1992) Numerical simulation of transient hypervelocity flow in an expansion tube, NASA CR 189601.Google Scholar
  2. Paull A, Stalker RJ (1992) Test flow disturbances in an expansion tube. J. Fluid Mechs. 245:493–521CrossRefADSGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • A. Paull
    • 1
  1. 1.Mechanical Engineering DepartmentUniversity of QueenslandAustralia

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