Similarity Law of Air-Water Two-Phase Flow Performance of Centrifugal Pump
Similarity Law of Air-Water Two-Phase Flow Performance of Centrifugal Pump
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DOI：
10.1115/fedsm2007-37469
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Naoki Matsushita;S. Watanabe;K. Okuma;T. Hasui;A. Furukawa
中科院分区：
文献类型：
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作者：
Naoki Matsushita;S. Watanabe;K. Okuma;T. Hasui;A. Furukawa
常规离心泵的气水两相流性能即使在入口含气率小于10%时也会导致不允许的扬程恶化。本文提出了一种双旋转叶栅串列布置，仅在外旋转叶栅中采用大于90°的大叶片出口角，作为气水两相流条件下的高性能离心泵叶轮。为了进一步提高泵的性能，在叶轮出口下游加装了扩压器叶栅。在设计各种尺寸和工况的气水两相流离心泵时，以及在单相流中，泵的性能相似律是十分有用的。本文研究了该叶轮的叶轮直径、叶片高度和转速的相似律。结果表明，即使在两相流条件下，叶轮直径和转速的相似律也得到了实验验证。此外，叶片高度对气水两相流性能的影响与相似律的影响有一定的差异。然后，通过使用护罩壁上的静压头和叶轮中的空气行为的结果来讨论这种差异。Copyright © 2007 by ASME
Air-water two-phase flow performance of conventional centrifugal pumps causes the impermissible head deterioration even at an inlet void fraction less than about 10%. A tandem arrangement of double rotating cascades and higher blade outlet angle more than 90° only in outer rotating cascade has been proposed as a centrifugal pump impeller with high performance in air-water two-phase flow condition. To obtain further improvement of pump performances, a diffuser cascade is installed downstream of impeller outlet. In design of air-water two-phase flow centrifugal pump in various size and operating conditions as well as in single-phase flow, similarity law of pump performances is very useful. The similarity law of impeller diameter, blade height and rotational speed is investigated for the proposed impeller in the present paper. As the results, the similarity law of impeller diameter and rotational speed is certified experimentally even in two-phase flow condition. In addition, influences of blade height on air-water two-phase flow performances indicate a little difference from the similarity law. This difference is, then, discussed by using the results of static head on the shroud wall and air behaviors in the impellers.Copyright © 2007 by ASME