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

(1)如本研究申请表所述，为了使磁场强度更大，减少发热，我们将原来的电磁铁转子改为永磁体转子。此外，为了减少摩擦损失，我们将螺旋流道直径从6 mm改为8 mm，并将磁流体斩波器改为新型的，可以通过一个电磁阀和一个双定时器来控制，以间歇地引入磁流体。(2)通过实验测量了(A)最大排气压力和(B)固定排气压力下的排气量，以确定压缩机的性能。在实验中，我们改变了磁场的旋转速度和磁场的引入速率，即引入磁场的频率和单位引入的磁场体积。实验的主要结果是：在稳定运行条件下，最大放电压力约为400kPa，是前一种情况的2-7倍，空气流量随逆变器频率f，即磁体转速的增加而增加，在f=4 Hz时，达到7 cm~3/S，是前一种情况的两倍。(3)假设盘管中的磁场完全与空气分离为间歇性的磁场段塞，将实验结果与简化模型的计算结果进行了比较。由此得出以下结论：实验中的最大放电压力约为。实验中的排风量约为计算的1/2，必须进一步改进中频引入系统，才能实现理想的中频段塞。(4)上述结果和发现是在日本熊本和美国火奴鲁鲁举行的两次会议上报道的，如反面所示。

(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.