日本機械学会論文集 73 巻 (2007) 735 号 p. 2260-2268
The effect of Reynolds number on the performance of regenerative pump was examined under low Reynolds number range. It was found that the head of a regenerative pump increased in low flow rates and decreased in high flow rates as the Reynolds number decreased in experiment. The computation of the internal flow was performed to clarify the cause of the Reynolds number effect. It was found that the head at low flow rates becomes larger at smaller Reynolds number due to the increase of the shear force exerted by the impeller. At low Reynolds number, the angular momentum supplied by a casing wall decreased as the flow rate increased. It was suggested that the head decreases at high flow rates due to the increase of the loss in the inlet and outlet pipes and the decrease of the angular momentum supplied by the casing wall.