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Yokohama National University Repository >
5 Faculty of Engineering / Graduate School of Engineering / School of Engineering >
5-1 学術雑誌論文 >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/10131/3730
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| Title: | Theoretical Determinations of the Flow Characteristics in volutes |
| Author: | Kurokawa, Junichi |
| Affiliation: | Associate Professor, Yokohama National University, Japan. |
| Issue Date: | 1980 |
| Publisher: | International Association of Hydraulic Research (IAHR) Section for Hydraulic Machinery, Equipment and Cavitation |
| Abstract: | The frictionless flow in volutes of 'two-dimensional logarithmic spiral is theoretically analyzed to determine the flow characteristics at off-design conditions . The first approximate solutions are obtained using a simplified flow-model based on the assumption that total head is constant around an impeller. The flow in the radial space between the impeller exit and the volute inlet is further analyzed using the obtained results and the Busemann's impeller outlet conditions. In the next step the method modifying the first approximate solutions is developed with the total head variation around an impeller taken into account. For application to the other forms of spiral the simple modification method is also presented for rough estimation of the volute characteristics. The comparison of the calculated results with the measured data from the literatures showed satisfactory agreement in the wide range of flow-rates. The analytical solutions obtained are expressed in relatively simple forms and are convenient to evaluate the effects of various design parameters of volutes.
Une analyse théorique sur l'écoulement sans friction dans la bâche spirale est présentée pour en évaluer la caracteristique. L'approximation de premier ordre est donnée par le modèle simple de l'écoulement où la chute totale soit constante au long de la péripherie de la roue. Ensuite, l'écoulement dans la chambre de tourbillon est aussi determiné sous la condition à l'orifice de roue, celle qui a été proposée par Busemann. L'approximation suivante consiste de tenir compte de la variation de la chute à la sortie de roue. Le résultat est en accord satisfaisante avec des observations experimentales qui sont publiées jusqu'à present .dans le domaine assez étendu de taux de courent. La résultat de la forme moin compliquée sera bien utilisée pour évaluer des paramètres géométrique de la volute. |
| URI: | http://hdl.handle.net/10131/3730 |
| Type: | Conference Paper |
| Language: | eng |
| Journal Title: | IAHR 10th Symposium : Hydraulic Mchinery and Equipment associated with Energy Systems in the New Decade of the 1980's |
| Volume: | 1 |
| Start Page: | 623 |
| End Page: | 634 |
| Version: | publisher |
| Appears in Collections: | 5-1 学術雑誌論文
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| B-014.pdf | | 902Kb | Adobe PDF | View/Open |
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