Simplified Three-Dimensional Modeling for MHD DCW Channels

Liu, B. L.; Lineberry, J.T.; Schmidt, H. J.

doi:10.2514/3.62683

Cited by 1 publication

(1 citation statement)

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“…These forces cause secondary flows to develop as the flow progresses down the region of electromagneticfluid interaction. The theoretical treatment of this problem has included the work of Fay (1959), Broer, Peletier & Wijngaarden (1960), Sat0 (1961), Tani (1962), Apollonskii & Kos'kin (1968), Sastry & Bhadram (1978), Liu, Lineberry & Schmidt (1983) and Ishikawa & Umoto (1984); in particular, for conditions that would be typical of a commercial-scale MHD power generator, these secondary flows were predicted to be of substantial magnitude in the calculations reported by Maxwell et al (1977), Bityurin, Zatelepin & Lyubimov (1978) and Doss & Ahluwalia (1983). The calculated magnitude of these flows for a commercial-scale device ranges from 10-30 % of the bulk velocity, depending on conditions, and the predicted consequences voltage drops.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of secondary flow in a magnetohydrodynamic channel

Girshick

Kruger

1986

J. Fluid Mech.

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The Hall effect in the magnetohydrodynamic (MHD) channel flow of a plasma leads to the presence of transverse Lorentz forces. The non-uniform distribution of these body forces may cause secondary flows to develop; these can exert a significant influence on the plasma momentum, thermal and electrical behaviour. The effect is predicted to be large for envisioned large-scale MHD devices. An experimental study of this phenomenon is described. The apparatus consisted of a laboratory-scale MHD channel in which a controlled net axial current was applied. Plasma velocities were measured using laser-Doppler anemometry. The results demonstrate that transverse Lorentz forces can drive intense secondary flows at a value of the magnetic interaction parameter based on the Hall current of approximately one. The peak measured transverse velocities were 15% of the bulk velocity. Qualitatively, the basic character of the large-scale secondary flow structure was in accord with a simple model based on a first-order distribution of the axial current density. Measurements were also made under a variety of conditions of the profiles of mean axial velocity and of the axial and transverse components of turbulence intensity, of electrode surface temperatures and of plasma voltage distributions. These results all support the conclusion that convective transport by MHD secondary flow caused significant asymmetries to develop in the cross-plane distribution of scalar quantities.

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