2433 シャフトレス遠心ポンプの内部流動状態に及ぼすJグルーブの影響(S41-5 流体機械に関連した複雑内部流動の解析と計測(ポンプ),S41 流体機械に関連した複雑内部流動の解析と計測)  [in Japanese] 2433 Effects of J-groove casing treatment on internal flow states of shaft-less centrifugal pump  [in Japanese]

The shaft-less centrifugal pump was developed based on the magnetic inductive system. The main feature is no shaft and floating impeller rotates in an independent condition because of bearing less and seal less structure. However, in low flow condition, the floating impeller rotate in instable condition. And, it was because of pressure fluctuatuon in internal flow. On the other hand, J-grooves is developed by KROKAWA for the purpose of improvement in unstable phenomena of mixes tuebo machine. It was reported that J-grooves was affect the internal pressure field. In this paper, we tried to control impeller attitude by use of J-grooves. Furthermore, the pump performance and floating condition of impeller were measured in ordre to make clear the effects of J-grove casing treatment on the shaft-less centrifugal pump.