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＜紀要論文＞
RESEARCHES ON PERIPHERAL PUMP
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| 概要 | The peripheral pump is widely used for a small type pump because of its suitable performance as a small type pump and the simplicity of its construction. The theory of its pumping action, however, has... not been clarified yet and the way of its design has not been established. As the pump is small and is easily constructed, a designer can find a suitable design by trial, utilizing the characteristics of many pumps made for examination. Certainly there has been previous research work done on the pump, but it has been only fragmental and could not be easily consolidated. Some theoretical researches were carried out by a group of rasearchers1), and the performances of a pump as shown by these theories were compared with the actual performances of the pump. The results show that the theories are not complete. The author carried out experimental researches on the characteristics of a pump as a whole, as well as pressure distribution inside the pump ; thus the outline of the pumping action of the impeller was made clear. As the flow of liquid driven by the impeller has an especially close relationship with turbulent flow, the author adopted a new theory which was something like a classical theory of turbulence, and established theoretical equations which satisfied many experimental data previously done. Using these equations we can consolidate almost all the researches on peripheral pump. In addition to these, the author carried out the experimental and theoretical researches on the mechanism of pumping action which he had assumed for the analysis of the pump characteristics. He not only verified that the assumption he had used was suitable, but also found the cause of cavitation which was obstructive to good performance of the pump. As a peripheral pump is used for discharging a little quantity of liquid against rather high pressure, the characteristics are influenced greatly by internal leakage. The author also studied this subject both theoretically and experimentally. In addition to these, he carried out quite a few experimental researches and made clear the influences of other factors which could not be clarified by his theory.続きを見る |
| 目次 | 1. Introduction. 2. The pumps and the devices used for experimental researches. 3. Flow in the pumping passage. 4. Relationship between the head and the discharge. 5. Influences of the suction nozzle. 6. Influence of the discharge nozzle. 7. Head capacity performance of a pump. 8. Intensity and characteristics of turbulence in the pumping passage. 9. Internal leakage. 10. The torque and the total head. 11. Correction coefficient for torque. 12. Structural relationship between the shape of the impeller and the intensity of turbulence. 13. The performance of a pump in which turbulence does not fully spread. 14. The influences of the dimension and the shape of the pumping passage on the coefficient of turbulence. 15. Influence of the molecular viscosity of liquid. 16. Efficiency of a pump. 17. Cavitation. 18. Conclusion.続きを見る |
詳細
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| 登録日 | 2023.11.21 |
| 更新日 | 2024.10.22 |