Abstract This study develops a micro-hydraulic turbine with excellent performance in the passage of foreign matter included in the water flow. The runner has four blades, with a circular hollow around the rotating axis to pass foreign matter through the runner. The ratio of the hollow diameter D 2 to the runner outer diameter D 1 , D 2 / D 1 , is defined as the hollow ratio e. Laboratory experiments are conducted by introducing polyester fibers into the water flow as foreign matter. The turbine efficiency η decreases with increasing e under the fiber-free condition. For the runner having no hollow (e = 0), η decreases drastically with increasing the mass of the introduced fibers. This is due to the blockage of the runner by the fibers. But η for the runners provided with the hollow decreases less. This demonstrates that the hollow makes the fibers pass successfully through the runner. Additional experiments are conducted using the runner with e = 0.25. The blade leading edges near the central axis are rounded with radius R. When R / D 1 = 0.1875, the decrease in η due to the fibers is extremely small. The rounded leading edges successfully prevent the runner from catching the fibers, demonstrating that they effectively heighten the passage performance of foreign matter through the runner.

中文翻译：

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异物通过性能优良的螺旋桨式中空微水力透平的研制

摘要 本研究开发了一种微水力涡轮机，该涡轮机在水流中的异物通过方面具有优异的性能。转轮有四个叶片，围绕旋转轴有一个圆形的空心，使异物通过转轮。中空直径D 2 与流道外径D 1 之比D 2 /D 1 定义为中空比e。实验室实验是通过将聚酯纤维作为异物引入水流中进行的。在无纤维条件下，涡轮效率 η 随 e 的增加而降低。对于没有空心的流道（e = 0），随着引入纤维质量的增加，η 急剧下降。这是由于流道被纤维阻塞所致。但是对于设置有空心的转轮，η 减少得较少。这表明中空使纤维成功地通过流道。使用 e = 0.25 的转轮进行额外的实验。靠近中心轴的叶片前缘圆角半径为R。当R / D 1 = 0.1875时，由于纤维导致的η减少非常小。圆形的前缘成功地防止了流道抓住纤维，表明它们有效地提高了异物通过流道的通过性能。