Abstract
The performance of the U-25B MHD generator is analyzed with theoretical predictive models developed at Argonne National Laboratory (ANL). Modifications and improvements of the computer codes, based on studies of the results obtained in experiments, are outlined and discussed. The theoretical predictions and experimental results are compared and found in good agreement. Sensitivity studies involving a number of input parameters are used to identify those parameters that have a strong impact on generator performance. Nomenclature A = channel cross-sectional area B = magnetic field d = electrode pitch Ex = Hall field Ex = open-circuit Hall field G = mass flow rate I/ = load current If = short-circuit current Aeak = leakage current Jx = axial current density Jy = transverse current density ks = effective wall roughness Ka = electrical conductivity factor = actual conductivity/ideal conductivity p = power output ^gap = electrical resistance between two adjacent frames SR = stoichiometric ratio T = static temperature Tw — wall temperature 7\r = oxidizer preheat temperature /3 = Hall parameter 6 = frame diagonalization angle o = plasma conductivity \l/ = oxygen enrichment = O2 molar concentration in oxidizer = average over the channel cross section
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