Extrathermal Electrical Conductivity Measurements in a Magnetoplasmadynamic Generator

摘要: A DETAILED description of the International Research and Development Co., Ltd., magnetoplasmadynamic (MPD) generator has been given previously1,2. On July 14, 1964, a series power generation experiments with caesium seeding helium were undertaken. This differed from previously reported runs3 mainly in nozzle configuration materials. To reduce end current leakage, tantalum used was replaced by boron nitride nozzle, exit region lengthened 2 in. interior diffuser inlet spray-coated alumina. The channel constructed attempts to internal leakage encountered alumina3. Sixteen pairs narrow (1/16 × 1/2 in.) electrodes five square (1/2 previously; gap between large (3/16 in.), insulator boundary layer electrical breakdown. Five pins diam.) monitor open circuit voltages, two three region. Four static pressure tappings thermocouples also located wall. During operation loop gas temperatures excess 1,700° C measured. maximum temperature measured 1,110° corresponding flow velocity 1,730 m/sec Mach number 0.79.