気液二相遠心ポンプにおけるタンデム回転翼列羽根車の高揚水性能設計について

概要

論文の詳細を見る
In order to develop a usable centrifugal pump even at high inlet void fraction in air-water two -phase flow, two kinds of tandem cascaded impellers, which consist of two or three stages of rotating circular cascades having blade outlet angle of 90°, have been investigated experimentally. It is obtained as results that the effectiveness of tandem arrangement of cascades appears at the air/water flow rate ratio less than 17% as compared with two-phase head degradation of a single cascaded impeller having the same outlet blade angle. Though two stages of rotating cascades are enough to obtain high pump performance, not multi-stages, it is important that blade numbers of the inner and outer cascades should be identified and both blades have to be set peripherally at an appropriate relative positions. With further increase of air/water flow rate ratio more than 17% there is no difference in two-phase flow performance between a single and tandem cascaded impellers having the same blade outlet angle.
2000-09-25