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＜紀要論文＞
INFLUENCES OF THE SUCTION NOZZLE ON THE CHARACTERISTICS OF A PERIPHERAL PUMP AND AN EFFECTIVE METHOD OF THEIR REMOVAL
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| 概要 | In the other paper the present writer suggested that the characteristics of a peripheral pump might be improved if the influences of the suction nozzle could be removed. In this paper the development ...of the study in the line, both theoretical and experimental, are reported together with some results which verify the above mentioned idea. In the first place the cause of the influences of the suction nozzle is studied : by proving that the influences of the immature development of the velocity profile are not important and that the turbulence is not yet sufficiently developed in the pumping passage near the nozzle, it is clarified that the latter is the source of those influences. In order to cancel these effects, the position of the entry of the pumping passage should be moved down-stream. By doing so, the fluid is disturbed by the impeller and the turbulence is thus fully developed, and then the turbulent fluid enters the pumping passage. The suction nozzle of a pump is reformed into three kinds of forms and their characteristics are compared with each other. It is shown that a pump modified in a suitable manner have much better characteristics than those of an old type.続きを見る |
| 目次 | 1. Introduction. 2. The cause of the influence of the suction nozzle. 3. Calculation of the influence of the entry. 4. The mechanism of the turbulence. 5. Reformation of the entry. 6. The pressure distribution in the pumping passage. 7. The performance of the reformed pump. 8. Performance at cavitation. 9. Conclusion. |
詳細
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| 登録日 | 2023.11.21 |
| 更新日 | 2024.10.22 |