Effect of Flow Swirling on the Subsonic Air Jet in the VGU-4 HF Plasmatron

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The effect of taking into account stream swirl when calculating the flow of a subsonic air plasma jet past a cylindrical model of 50 mm in diameter when the jet flows out from the discharge channel into the test chamber of the VGU-4 IPMech RAS HF plasmatron is studied. A comparison has been made of calculations of axisymmetric flow past the model based on the full Navier-Stokes equations taking into account (new results) and without taking into account (old results) the tangential velocity component w under the experimental conditions at a pressure of 80 mbar in a wide range of anode supply power at various distances from the plasmatron channel outlet to the model. It is shown that when calculating the VGU-4 plasmatron for a low power with taking into account flow swirl, the pattern of flow past the frontal part of the model is modified, namely, a vortex region is formed in front of the model instead of a relatively thin boundary layer. For moderate and high plasmatron power, the effect of taking into account swirl on the isolines of the dimensionless stream function and on the isotherms is small in the jet core region in front of the model, but is significant in the outer flow region in the test chamber.

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Sobre autores

S. Vasilyevsky

Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: koles@ipmnet.ru
Rússia, Moscow

A. Kolesnikov

Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences

Email: koles@ipmnet.ru
Rússia, Moscow

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2. Fig. 1. Radial profiles of longitudinal (a) and tangential (b) velocity components at the discharge channel slice for three values of Nap power: 1 - 3 - Nap = 30, 50 and 70 kW.

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3. Fig. 2. Isolines of dimensionless current function in the jet core for the mode Nap = 20 kW, Zm = 60 mm: (a) - calculation taking into account twisting; (b) - calculation without taking into account twisting.

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4. Fig. 3. Isotherms in the jet core for the mode Nap = 20 kW, Zm = 60 mm: (a) - calculation taking into account twisting; (b) - calculation without taking into account twisting.

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5. Fig. 4. Isolines of the tangential velocity component w (z, r) [m/s] throughout the computational domain for the Nap = 30 kW, Zm = 60 mm mode.

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6. Fig. 5. Isolines of the dimensionless current function in the whole calculation region for the mode Nap = 30 kW, Zm = 60 mm: (a) - calculation taking into account twisting; (b) - calculation without taking into account twisting.

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7. Fig. 6. Distributions of enthalpy h (z) (a) and temperature T (z) (b) along the jet axis from the channel cut-off to the model for three power values Nap = 30, 50, 70 kW; dashed curves are calculations without considering twist.

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8. Fig. 7. Distributions of dimensionless parameters - velocity u (z) / u (0) (a) and velocity gradient u1 (z) (b) along the jet axis for two power values Nap = 30 and 70 kW; dashed curves - calculations without taking into account twisting.

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