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Linear Impulse Response of a Plasma Jet

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IUTAM Laminar-Turbulent Transition

Part of the book series: IUTAM Bookseries ((IUTAMBOOK,volume 38))

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Abstract

The full linear impulse response of the VKI plasma wind tunnel jet is investigated by solving a numerical spatio-temporal linear stability problem. A DNS code from literature is modified by including high temperature effects and compared to the finite-volume solver CoolFluid-ICP. High order schemes employed in the DNS code allow us to obtain radial derivatives of flow quantities needed by stability computations without relying analytical interpolations used with CoolFluid-ICP base flow. Simulations consider an axisymmetric jet described by the low Eckert number approximation of the Navier Stokes equations, for a mixture of perfect gases in local thermo-chemical equilibrium including ionization effects. The new steady state obtained through selective frequency damping is compared against CoolFluid-ICP simulations and the impact on stability features is assessed. Although an overall good agreement is found between the base states, DNS results yield a slightly thicker shear layer than previous simulations. Our analysis suggests that instability modes with pressure perturbations peaking in the shear are strongly affected by the change of base state, while jet-column modes with a maximum pressure perturbation around the centerline are hardly affected.

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Acknowledgements

This work benefited from the support of the Fonds de la Recherche Scientifique - FNRS under the FRIA Grant. U.A.Q. acknowledges support from the Leverhulme Trust and Isaac Newton Trust, through an Early Career Fellowship.

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Authors and Affiliations

  1. Von Karman Institute for fluid dynamics, Chaussée de Waterloo 72, 1640, Rhode-Saint-Genese, France

    S. Demange & F. Pinna

  2. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK

    U. Ali Qadri

Authors
  1. S. Demange
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  2. U. Ali Qadri
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  3. F. Pinna
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Correspondence to S. Demange .

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Editors and Affiliations

  1. Imperial College London, London, UK

    Spencer Sherwin

  2. Imperial College London, London, UK

    Peter Schmid

  3. Imperial College London, London, UK

    Xuesong Wu

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Demange, S., Qadri, U.A., Pinna, F. (2022). Linear Impulse Response of a Plasma Jet. In: Sherwin, S., Schmid, P., Wu, X. (eds) IUTAM Laminar-Turbulent Transition. IUTAM Bookseries, vol 38. Springer, Cham. https://doi.org/10.1007/978-3-030-67902-6_25

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  • DOI: https://doi.org/10.1007/978-3-030-67902-6_25

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-67901-9

  • Online ISBN: 978-3-030-67902-6

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