Influence of the ionization rate of a plasma discharge applied to the modification of a supersonic low Reynolds number flow field around a cylinder

Abstract : This paper describes experimental and numerical investigations focused on the shock-wave modification induced by a plasma actuator in the rarefied flow regime. The experimental investigation was carried out in the supersonic wind tunnel MARHy located at the ICARE laboratory, and the numerical investigation using a 2D fully compressible Navier–Stokes simulation was carried out at the IUSTI laboratory. The study concerns a cylinder in a Mach 2 air flow equipped with a small electrode that creates a local plasma. Electrical and optical diagnostics were used to experimentally analyse the plasma effects on the flow field. Measurements show that the shock stand-off distance increases with the discharge power. Numerical simulations show that the modification of the shock position is not induced by thermal effects. A theoretical approach is then developed in order to take into account the specific properties of plasma such as thermal non-equilibrium and ionization. It is found that the stand-off distance is directly coupled with the ionization degree of the plasma.
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Contributor : Romain Joussot <>
Submitted on : Friday, March 13, 2015 - 3:49:03 PM
Last modification on : Thursday, March 21, 2019 - 9:24:04 AM

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V Lago, Romain Joussot, J-D Parisse. Influence of the ionization rate of a plasma discharge applied to the modification of a supersonic low Reynolds number flow field around a cylinder. Journal of Physics D: Applied Physics, IOP Publishing, 2014, 47 (12), pp.125202. ⟨10.1088/0022-3727/47/12/125202⟩. ⟨hal-01131445⟩

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