Numerical Studies of Magnetohydrodynamic Flow Control Considering Real Wall Electrical Conductivity

摘要

Effectiveness of the magnetohy drodynamic (MHD) flow control is explored, where effects of electrical conductivity of wall of a space vehicle are studied by two-dimensional numerical simulations under the reentry flight conditions at the altitude of about 60 km in the OREX experiment (in Japan, 1994) for a wide range of the electrical conductivity of wall (from 10~(-5) to 10~5 S/m) and for three different values of the wall thickness: 1, 10, and 100 mm. The computational code employs Park's two-temperature model, Dunn and Kang's chemical reactions model, and the low magnetic Reynolds number model with the Hall effect. The numerical results clearly show that there is an upper limit of the electrical conductivity of wall for making the MHD flow control useful. When the electrical conductivity of wall is the value of upper limit or less, the difference in the electrical conductivity does not influence the effectiveness of the MHD flow control.