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Experimental exploration of underexpanded supersonic jets

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Abstract

Two underexpanded free jets at fully expanded Mach numbers \(M_\mathrm{j}\) = 1.15 and 1.50 are studied. Schlieren visualizations as well as measurements of static pressure, Pitot pressure and velocity are performed. All these experimental techniques are associated to obtain an accurate picture of the jet flow development. In particular, expansion, compression and neutral zones have been identified in each shock cell. Particle lag is considered by integrating the equation of motion for particles in a fluid flow and it is found that the laser Doppler velocimetry is suitable for investigating shock-containing jets. Even downstream of the normal shock arising in the \(M_\mathrm{j}\) = 1.50 jet, the measured gradual velocity decrease is shown to be relevant.

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Acknowledgments

This research has been funded by the French Research Agency (Agence Nationale de la Recherche) through the ANR-10-BLAN-937-01 project JESSICA. The authors wish to thank Emmanuel Jondeau for his great help in setting up and performing the LDV experiments.

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Authors and Affiliations

  1. Laboratoire de Mécanique des Fluides et d’Acoustique, UMR CNRS 5509, Ecole Centrale de Lyon, Université de Lyon, 36 Avenue Guy de Collongue, 69134 , Ecully Cedex, France

    Benoît André, Thomas Castelain & Christophe Bailly

  2. Université Lyon 1, 43 Boulevard du 11 Novembre 1918, 69622 , Villeurbanne Cedex, France

    Thomas Castelain

  3. Institut Universitaire de France, Paris, France

    Christophe Bailly

Authors
  1. Benoît André
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  2. Thomas Castelain
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  3. Christophe Bailly
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Corresponding author

Correspondence to Thomas Castelain.

Additional information

Communicated by A. K. Hayashi and K. Kontis.

The paper was based on work that was presented at the 28th International Symposium on Shock Waves, 17–22 July.

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André, B., Castelain, T. & Bailly, C. Experimental exploration of underexpanded supersonic jets. Shock Waves 24, 21–32 (2014). https://doi.org/10.1007/s00193-013-0457-4

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  • DOI: https://doi.org/10.1007/s00193-013-0457-4

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