安定限界流量付近の平行円板間遠心旋回流れ

抄録

Flows through the passage between two parallel discs from inner to outer radii accompanying strong circumferential swirl have been investigated in view of flow stability in vaneless diffuser of centrifugal pumps and compressors. Particular concern is on the phenomenon of rotating stall which is observed as the flow rate is reduced to a critical value. Experiments have been carried out and the results have been put in order, showing (i) diffuser characteristics, (ii) streamline and vorticity distributions, (iii) loss coefficients, (iv) stall cell propagation speed and fluctuation amplitude, (v) rotating pressure patterns, wherefrom a proposition has been made for explaining the mechanism of stall cell propagation.