フランシス形ポンプ水車の水車段状特性 : 第2報,ランナ形状要素の実験的検討

概要

論文の詳細を見る
In a previous paper, it was described that turbine step characteristics occured in runners which had a low ratio of exit diameter to entrance diameter and a large entrance angle. A new runner of extremely low specific speed, however, does not show the characteristic in contrast to the result of the paper .Then, the relation between the shape of many runners and the characteristic is studied. As a result, it is clarified that, (1) whether the characteristic occurs or not depends on the relation between the ratio of the exit diameter to the entrance diameter D_2/D_1 and the ratio of outlet clearances to the entrance diameter δ_2Z/D_1, where δ_2 is an outlet width between vanes, and Z is the number of vanes, and (2) decreasing δ_2Z/D_1 and an entrance angle, and increasing D_2/D_1 and the spiral angle of a vane are effectively in suppression of the occurrence of the characteristic.
一般社団法人日本機械学会の論文
1988-08-25