Experimental Two-Phase Liquid-Metal Magnetohydrodynamic Generator Program.
Annual rept. Aug 75-Sep 76,
ARGONNE NATIONAL LAB ILL ENGINEERING DIV
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The revised ambient-temperature NaK-nitrogen facility is described. The maximum liquid flow rate and generator inlet pressure are 10.9 kgs 200 gpm and 1.48 MPa absolute 200 psig, respectively, compared with the previous values of 6 kgs 110 gpm and 0.72 MPa absolute 90 psig. Satisfactory loop operation has been obtained, and new experiments with the second diverging-channel generator were completed. The principal experimental results were a higher density for the same generator operating conditions, and an apparent tendency for the efficiency to improve more with increasing quality at higher velocities than lower velocities. An evaluation of an annular generator geometry is presented. The advantages and disadvantages of the geometry are described, the equations developed, and solutions obtained for three cases--constant velocity and no armature reaction, laminar flow with no armature reaction, and armature reaction with constant velocity. Numerical examples show that 1 the attainable terminal voltages appear to be very low, 2 flow reversal and large viscous loss occur at or below the desired power densities, and 3 armature reaction effects are important and compensation techniques appear impractical. Thus, this annular geometry does not appear attractive for either generator or pump operation.
- Electric Power Production and Distribution
- Fluid Mechanics
- Plasma Physics and Magnetohydrodynamics