[article]
| Titre : |
Effect of J-groove on the suppression of swirl flow in a conical diffuser |
| Type de document : |
texte imprimé |
| Auteurs : |
Junichi Kurokawa, Auteur ; Hiroshi Imamura, Auteur ; Young-Do Choi, Auteur |
| Année de publication : |
2010 |
| Article en page(s) : |
08 p. |
| Note générale : |
fluids engineering |
| Langues : |
Anglais (eng) |
| Mots-clés : |
pressure flow (dynamics) diffusers |
| Résumé : |
The purpose of this study is to examine the validity of J-grooves in controlling and suppressing the swirl flow in a conical diffuser, for draft surge suppression in a Francis turbine, which is caused by the swirl flow from the runner outlet into the draft tube. “J-groove” composed of shallow grooves and mounted parallel to the pressure gradient on the diffuser wall is a very simple passive device to suppress several abnormal phenomena in turbomachinery. The experimental study has been performed using the conical diffuser with a divergent angle of 20 deg. The measured results of the velocity distribution in the diffuser show that a considerable reduction in the swirl intensity is attained by using J-grooves. Besides, the amplitude of pressure fluctuation caused by the rotation of the vortex core around the dead water region near the diffuser inlet is reduced by J-grooves. |
| DEWEY : |
620.1 |
| ISSN : |
0098-2202 |
| En ligne : |
http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] |
in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 7 (Juillet 2010) . - 08 p.
[article] Effect of J-groove on the suppression of swirl flow in a conical diffuser [texte imprimé] / Junichi Kurokawa, Auteur ; Hiroshi Imamura, Auteur ; Young-Do Choi, Auteur . - 2010 . - 08 p. fluids engineering Langues : Anglais ( eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 7 (Juillet 2010) . - 08 p.
| Mots-clés : |
pressure flow (dynamics) diffusers |
| Résumé : |
The purpose of this study is to examine the validity of J-grooves in controlling and suppressing the swirl flow in a conical diffuser, for draft surge suppression in a Francis turbine, which is caused by the swirl flow from the runner outlet into the draft tube. “J-groove” composed of shallow grooves and mounted parallel to the pressure gradient on the diffuser wall is a very simple passive device to suppress several abnormal phenomena in turbomachinery. The experimental study has been performed using the conical diffuser with a divergent angle of 20 deg. The measured results of the velocity distribution in the diffuser show that a considerable reduction in the swirl intensity is attained by using J-grooves. Besides, the amplitude of pressure fluctuation caused by the rotation of the vortex core around the dead water region near the diffuser inlet is reduced by J-grooves. |
| DEWEY : |
620.1 |
| ISSN : |
0098-2202 |
| En ligne : |
http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] |
|
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