Development of high-performance fluid drive gas compressor using magnetic fluid

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(1) As was described in theapplication form of this research, we changed the rotor with electromagnet in the previous type to that with permanent magnets in order to make magnetic intensity powerful and reduce generation of heat. In addition, we changed the coiled channel diameter from 6 to 8 mm in order to reduce friction loss, and changed the MF (magnetic fluid in abbreviation) chopper to the new type, which can be controlled with a solenoid valve and a twin-timer in order to intermittently introduce the MF.(2) We experimentally measured (a) maximum discharge pressure and (b) air discharge rate at a fixed discharge pressure to determine the compressor performance. In the experiment, we changed the rotational velocity of magnetism as well as the MF introduction rate, i.e. the frequency of MF introduction together with the MF volume per unit introduction. The main findings from the experiment were :● The maximum discharge pressure was about 400 kPa under a steady operation condition, and was 2 - 7 times higher than that in the previous type.● The air discharge rate increased with the inverter frequency, f, in other word, the rotational velocity of magnetism, and at say, f = 4 Hz, it became 7 cm^3/s being twice of that in the previous type.(3) We compared these experimental results with the calculations by a simplified model for an ideal case, assuming the MF in the coiled channel to be completely separated from air as intermittent MF slugs. From this, we found the followings :● The maximum discharge pressure in the experiment was about. 1/10 of that in the calculation.● The air discharge rate in the experiment was about 1/2 of that in the calculation.● We must further improve the MF introduction system to realize the ideal MF slugs in the channel.(4) The above results and findings were reported at two conferences held in Kumamoto, Japan and Honolulu, USA, as seen in reverse side.