Investigation of High Frequency magnetohydrodynamic propulsion

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A high frequency magnetohydrodynamic propulsion (HF MHD) which overcomes the problems for electrolysis of sea water and electrolytic corrosion in the electrode was developed. In the first place, a magnetohydrodynamic propulsion unit (MHD Unit) which was composed from several ferrite cores and carbon electrode was produced. A zero current switching (ZCS) type HF inverter for the high frequency power supply was numerically analyzed from the view point of soft switching. The ZCS operation region in the mu (normalized frequency) and lambda (normalized load) plane was elucidated in connection with switching stress in the resonant operation of the switching devices. On the basis of the analysis, the HF MHD system was designed and effectively tested in the sea water tank. From the results, no problem of electrolysis of sea water and electrolytic corrosion occured with good propulsion condition. In the second place, a new type of MHD unit which had less leacage flux than the first MHD unit applied an silicon steel core was produced. Furthermore, an improved type full bridge ZCS HF inverter which had wide ZCS stable operation region was developed. Through the numerical anlysis, the HF power supply was applied for the new MHD system and tested. More high speed of sea water flow was obtained in comparison with the first MHD system. The new principle of HF MHD was supplemented with experimental results.