Flow modes in shock tubes with electromagnetic driving sections

Pert, G.J.

doi:10.1088/0022-3727/3/2/315

J. Phys. D: Appl. Phys.

1970

DOI: 10.1088/0022-3727/3/2/315

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Flow modes in shock tubes with electromagnetic driving sections

G.J. Pert

Abstract: The stability of the shock front under free-flow down the expansion tube of an electromagnetically driven shock tube is investigated. The results of a wide range of experiments covering different electrode geometries, ambient gas pressures and front velocities in hydrogen, helium and argon are analysed. It is found that a condition for stability can be found in terms of a critical hydrodynamic Reynold's number of about 9000 for the flow. The implications of this result are discussed.

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1972

1976

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Electrical breakdown in a collision-dominated plasma sheath

Mikoshiba

Smy

1973

Journal of Applied Physics

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The field strength at a cathode is increased by the presence of a moving plasma due to the formation of a cathode sheath in which the ion mobility is reduced by the high neutral density in the cold boundary layer formed around the electrode. If further field intensification due to surface irregularities is included, the field at the cathode reaches and exceeds 3 X 10 7 V fcm, the field emission threshold. This field can be achieved at an applied voltage between electrodes of 40 V, which is well below the Paschen minimum. This effect was studied experimentally using the argon plasma generated in electromagnetically driven shock tube for wide ranges of plasma density (l09_10 16 cm -3), degree of ionization, and initial pressure (0.1-10 Torr). The results should form the basis for prediction of the reignition characteristics in the all important period immediately (1-10 ,",sec) after the cessation of an arc.

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Electrical breakdown in a collision-dominated plasma sheath

Mikoshiba

Smy

1973

Journal of Applied Physics

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Flow Velocity Measurements in a T Tube

Strachan

1972

The Physics of Fluids

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The flow velocity of a T-tube plasma has been measured by recording the attenuation of a known shock wave propagating through the T-tube flow. This technique yields results with typical accuracies of 0.1 km/sec which is about 10% of the velocity of the probing shock. The interpretation of the results invites a comparison of the T-tube flow field with an overexpanded detonation or breakdown wave in the high-velocity regime and with a radiation driven shock front in the low-velocity regime.

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The stability of shock waves in ionizing and dissociating gases

Griffiths

Sandeman

Hornung

1976

J. Phys. D: Appl. Phys.

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The stability of strong shock waves in argon and carbon dioxide has been studied in a free-piston shock tube using time-resolved interferometry. Unstable shock fronts have been found to occur close to velocities where (dP/dV)H (where P and V are the pressure and the specific volume behind the shock) on the Rankine-Hugoniot curve is positive due to completion of first ionization or dissociation. Such an instability has been described theoretically by D'iakov (1954). However, his stability limits have not been reached in this case, and this suggests that the linearized perturbation analysis is not accurate for the case of the real shock tube flow.

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Flow modes in shock tubes with electromagnetic driving sections

Cited by 3 publications

References 32 publications

Electrical breakdown in a collision-dominated plasma sheath

Electrical breakdown in a collision-dominated plasma sheath

Flow Velocity Measurements in a T Tube

The stability of shock waves in ionizing and dissociating gases

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