AbstractThe results of an experimental study on performance of a supersonic closed loop with a disk MHD generator are described. High‐temperature (>1900 K) argon circulation was carried out successfully for 2.4 hours. The heat gain and loss of argon was investigated, and a large heat loss was found at the diffuser and the exhaust duct, although the energy efficiency of the recuperator was high. The large heat loss was ascribed to water cooling at the diffuser and the exhaust duct. At the same time, enhancement of the heat transfer coefficient was suggested. The argon temperature and the heat loss calculated under the assumption of a heat transfer coefficient four times as large show good agreement with experimental data. The pressure ratio inside the loop was investigated, and the results indicate that the total pressure upstream of the nozzle throat is decided by the total temperature and the mass flow. On the other hand, the total pressure on the downstream side is determined by the total mass in the loop and the total pressure on the upstream side. The first power generation was carried out, and a good correlation between the load resistance and the Hall voltage was observed.
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