EXPERIMENTAL AND THEORETICAL INVESTIGATION OF HIGH-PRESSURE ARCS .2. THE MAGNETICALLY DEFLECTED ARC (3-DIMENSIONAL MODELING)

While Part I deals with cylindrical arcs, Part II studies the influenc e of transverse magnetic fields on the are column for ambient pressure s of 0.1-5.0 MPa. If exposed to a magnetic induction of several millit esla, the column of an are is deflected by the Lorentz forces, In this paper, heat transfer and fluid flow with coupled electromagnetic forc es are modeled for the magnetically deflected are. To verify the predi ctions, the three-dimensional temperature distributions of the are col umn are determined by line and continuum radiation measurements using tomographic methods, These temperature maps are compared with the resu lts of the numerical simulations, To gain insight into the physical pr ocesses of the discharge and to make the are properties available whic h are not readily measured, a self-consistent numerical model of the a re column is applied to the time-dependent and three-dimensional case, The temperature, velocity, pressure, and current densities are predic ted by solving the conservation equations for mass, momentum, and ener gy, and Ohm's and Biot-Savart's law using material functions of the pl asma, A control volume approach facilitates a numerically conservative scheme for solving the coupled partial differential equations, The pr edictions are in fair agreement with experimental results. A time-depe ndent fully implicit simulation of the are was used to investigate the are instabilities for large magnetic inductions.